Process of restarting arc after power failure during vacuum consumable smelting of titanium and titanium alloys

The process of restarting arc after power failure during vacuum consumable smelting of titanium and Grade 5 Ti-6Al-4V Titanium Plate includes the following steps: when restarting arc after smelting interruption, the smelting current is rapidly increased to 75-80% of the normal smelting current, and the current is maintained at this time. When the edge of the molten pool reaches the crucible wall, keep it for 2-3 minutes, and then quickly increase the smelting current to the normal smelting current. The advantage of this process is that the total arcing time is greatly shortened, the gap between the cooling volume of the ingot and the crucible wall is reduced, and the internal shrinkage cavity formed by the cooling and solidification of the ingot is avoided: when the melting current reaches the normal melting current When the smelting current is 75~80%, keep the smelting current for a period of time, so that the melting speed of the electrode and the solidified molten pool can be controlled more accurately, so as to avoid the instantaneous generation of a large amount of molten liquid flowing into the gap between the ingot and the crucible wall, or causing cold insulation defects .

The application status of large aerospace forging materials

Aviation forgings generally use materials with high specific strength and specific stiffness. Materials for large aviation forgings mainly include titanium alloys, ultra-high-strength steels, and aluminum alloys.

Titanium alloys for large aerospace titanium forging

Due to its high specific strength, specific stiffness, corrosion resistance, and other excellent properties, titanium alloys have been widely used in the aviation industry, and have significant effects on reducing the weight of aircraft structures and improving the service life of parts. Especially for military aircraft, some important structural components such as wing spars, bulkheads, landing gear, etc. are widely processed from titanium alloy forgings, which have high weight, large size, and cross-sectional area.

At present, the main grades of Ultra-Thin Titanium Alloy Sheets for aviation are TC4, TC18, TC21, TA15, TB6 (US Ti-1023 alloy), and so on. Among them, TC18 is suitable for the manufacture of large forgings due to the highest hardenability and is currently the most widely used in China. According to the demand of civil aircraft such as Boeing and Airbus, Russia has developed Ti-55531 titanium alloy based on TC18 alloy by reducing the content of Fe, which is easy to segregate. Ti-55531 is higher strength, with superior hardenability and a wider processing window, and is currently used on parts such as A380 aircraft hanger joints and landing gear struts

Application of titanium alloy materials in pharmaceutical production industry

The pharmaceutical industry is an important industry related to people's physical and mental health, including pharmaceuticals, medical machinery, sanitary materials and other fields, and occupies an important position in the national economy. Titanium alloy materials are widely used in the pharmaceutical industry because they are non-toxic and harmless, and have good compatibility with the human body. ASTM F136 Titanium Medical Wire     Gr7 Ti-0.2Pd Titanium Wire     Gr2 Pure Titanium Foil     Gr23 Ti-6Al-4V ELI Titanium Tube

In pharmaceutical production, because the production of medicines is inseparable from acids, alkalis and salts, pharmaceutical equipment is easily damaged by corrosion. The use of steel equipment not only cannot solve the problem of serious equipment corrosion, but also causes a lot of loss of human, material and financial resources, affecting normal production. The use of titanium equipment solves this problem very well.

In the production of several main commonly used drugs, the equipment made of titanium has good corrosion resistance and obtains considerable economic benefits.

1. Production of vitamin B1

In my country, the hydrogen chloride conversion method is often used to produce vitamin B1, and the finished product is dried by cyclone and separated by two cyclones. The medium is thiamine hydrochloride, the pH value is 2.5, and the temperature is 110 °C, which is highly corrosive. The original drying device was made of stainless steel, and the inner wall was corroded and perforated after more than a year of use, and seriously polluted the medicine.

After adopting titanium screw feeder, cyclone separator, vortex body, hopper and discharge pipe and titanium lining of exhaust box, the production qualification rate of vitamin B1 has been increased from the highest 95% to 100%, and the equipment has not been corroded for more than 7 years , the cost of titanium can be recovered in 3 months.

2. Vitamin C production

Vitamin C is sorbitol as raw material, fermented into sorbose with black vinegar bacteria, and then fermented with Pseudomonas to obtain low-concentration gulonic acid, which is converted into finished product by hydrogen chloride after concentration.

Titanium is very resistant to corrosion in high temperature coronic acid. In the production process of this product, a titanium tubular heat exchanger, a titanium DHC-500 disc sinking type automatic slag discharge centrifuge, and a TC4 cast impeller are used, and no corrosion has been found for many years.

3. Antibiotic production

The main raw material for the chemical synthesis of chloramphenicol (an antibiotic) is methyl dichloroacetate, which contains about 2% chlorinated alkene and trichloroethylene. If steel equipment is used in the refining process, it is prone to severe corrosion, and titanium is used instead. The equipment has been intact since its manufacture.

How is the super corrosion resistance of titanium alloy made?

Titanium alloys are widely used because of a series of excellent properties. However, titanium alloys have high friction coefficient, are very sensitive to adhesive wear and fretting wear, have poor wear resistance, are easy to ignite under high temperature and high-speed friction, and have relatively poor resistance to high-temperature oxidation. The shortcomings seriously affect the safety and reliability of its structure and greatly limit its application. Therefore, improving the surface properties of titanium alloys such as wear resistance, high-temperature oxidation resistance, and corrosion resistance is an urgent problem to be solved. In addition to improving the composition and preparation process of alloys, surface modification of Seamless Titanium Tube Grade 2 is currently the most effective method.

In recent years, electron beam surface treatment technology has developed rapidly. When the electron beam with high energy density acts on the surface of the material, the surface of the material has physical, chemical, or mechanical properties that are difficult to achieve by conventional methods, and the wear resistance and corrosion resistance of the material surface is significantly improved. and high-temperature oxidation resistance. A domestic engineering technology company used pulsed high-current and low-energy electron beams for surface treatment of grade 5 titanium round rods and achieved good results.

Welding Process and Welding Quality Inspection of Titanium Alloy

In order to avoid common welding defects and at the same time ensure the mechanical properties and corrosion resistance of the weld, when welding titanium and its alloys, a reasonable titanium alloy processing technology must be formulated to ensure the welding quality. At present, the commonly used processes for welding titanium and titanium alloys include argon tungsten arc welding, melting electrode argon arc welding, plasma arc welding, electron beam welding, laser beam welding, brazing, etc.

titanium welding filler wire is a commonly used welding method for welding titanium alloys, mainly used for the welding of titanium and titanium alloys with a thickness of less than 10mm. Manual tungsten argon arc welding has wide adaptability and reliable welding quality, but it has low welding efficiency and high labor intensity for thick plate welding. Melting electrode argon arc welding is more efficient than tungsten electrode argon arc welding and is mainly used for welding thick plates, but the welding process requires higher process parameters and a welding environment, otherwise, it is easy to generate pores. The thickness range of plasma arc welding is relatively wide, and it can be used from thin plates to thick plates, but attention should be paid to the damage to the nozzle during welding. Vacuum electron beam welding is also increasingly used for titanium welding. Because it is in a vacuum environment, it can obtain high-quality welded joints, but at the same time, because it needs to be welded in a vacuum chamber, the size of the workpiece is limited. Compared with the electron beam and plasma beam welding, laser welding has a molten pool purification effect, which can purify the weld metal, and the mechanical properties of the weld are equal to or better than those of the base metal. Brazing can also be used for some micro and precise parts.

Weld quality inspection:

The inspection standards and the specific welding seam inspection standards are strictly implemented in accordance with the drawing requirements and contract requirements.

inspection method:

Appearance inspection and inspection of the surface color of titanium welded joints are the primary control points for the inspection of welded joints. The surface of the welded joint is silver-white and golden-yellow as qualified. Blue, purple, gray and other colors are unqualified, and the surface needs to be treated or repaired.

The appearance quality of welds:

First of all, there should be no welding deformation. The workpiece will generally deform after welding. If the deformation exceeds the allowable value, it will affect the use. Furthermore, it is necessary to control the amount of misalignment and the excess height of the weld, which cannot exceed the tolerance range of the relevant standards. The surface of titanium alloy welds should be free of slag, spatter, cracks, weld bead, incomplete penetration, undercut, excess convex surface (fillet weld), poor forming, misalignment, burn through, arc damage, collapse, porosity, slag inclusion Such defects are visible to the naked eye.

Titanium alloy "space metal", widely used in high-end manufacturing

Titanium has excellent performance and has the reputation of "space metal". Titanium alloy is an important structural material. It is based on titanium and adds other elements such as vanadium, aluminum, molybdenum, and chromium. It is processed by smelting, forging, rolling, extrusion and other processes. It has low density and high specific strength. , The outstanding advantages of high heat resistance and strong corrosion resistance are widely used in high-end fields such as aerospace, petrochemical, national defense and military industry and medical biology.

Titanium Grade 2 Round Rods are widely used in aerospace due to their high corrosion resistance and high specific strength. In terms of hardness, titanium alloy is much harder than the other three alloys, and the tensile strength of titanium alloy is also the highest. Due to the weight factor also needs to be considered in the product structure, the density of zinc alloy is the largest and the specific strength is the smallest, and the specific strength of titanium alloy is higher. At the same time, due to its strong corrosion resistance and heat resistance, titanium alloys are widely used in aircraft engine parts, rocket and missile structural parts.

Titanium processing technology is complex, difficult, and has high technical barriers. The production process of titanium material includes titanium ingot or titanium alloy ingot obtained by melting and casting of sponge ASTM F136 6Al-4V ELI Titanium Bar, and then the company makes titanium material through deformation treatment and machining in forging, rolling and other links according to customer needs and application field requirements, and further. Processed into titanium equipment. The smelting, pressure processing and heat treatment of titanium are relatively difficult, the process is complex, and the technical content is high. Among them, the preparation steps of titanium sponge and titanium materials are more complex and difficult to prepare, which are the key links in the application of titanium. Sponge titanium and titanium The quality of the material directly determines the quality of titanium products.

Domestic casting process: vacuum consumable arc melting (VAR) and cooling bed furnace melting (CHM) in parallel. Due to the high chemical activity of titanium, it will react with hydrogen, oxygen, nitrogen and most refractories in the air in the molten state, so the casting must be carried out in a vacuum or an inert atmosphere. At present, there are two mainstream melting and casting processes in the world: vacuum consumable arc melting (VAR) and cooling bed furnace melting (CHM). The advantage of the VAR method is that the process is mature and the operation is simple. There have been many metallurgical defects such as inclusions and composition segregation in the alloy ingot, which seriously affect the reliability of the material. In recent years, Chinese titanium companies have introduced several electron beam cold hearth melting and casting furnaces and plasma cold hearth melting and casting furnaces from the United States and Germany, and gradually adopt the VAR method and the CHM method in parallel for casting.

Titanium alloys are classified according to their strength and characteristics

Titanium alloys can be divided into low-strength titanium alloys, ordinary-strength titanium alloys, medium-strength titanium alloys, and high-strength titanium alloys according to their different strengths.

1. Low-strength titanium alloys are mainly used for corrosion-resistant titanium alloy sheet, and other titanium alloys are used for structural parts called structure titanium alloys.

2. Ordinary-strength titanium alloys (~500MPa), mainly including industrial pure titanium, TI-2AL-1.5Mn (TCI), and Ti-3AL-2.5V (TA18), are widely used alloys. Due to its good price formation performance and weldability, it is used to manufacture various aerospace sheet parts and hydraulic pipes, as well as civilian products such as bicycles.

3. Medium-strength titanium alloy (~900MPa), the typical alloy is Ti-6Al-4V (TC4), which is widely used in the aerospace industry.

4. High-strength titanium alloy is composed of near-beta titanium alloy pipe and meta-stable beta titanium alloy with a tensile strength at room temperature above 1100MPa. It is mainly used to replace high-strength structural steel commonly used in aircraft structures. Its typical alloys are Ti-13V- 11Cr-3Al, Ti-15V-3Cr-3Sn (TB5) and Ti-10V-2Fe-3Al.

Titanium tableware​Relevant domestic and foreign regulations on quality and safety

Regarding the quality and safety status of titanium alloy kitchen utensils, there are relevant regulations and standards at home and abroad.

1. Relevant domestic laws and regulations

In the early stage, the only metal products subject to domestic laws and regulations were stainless steel and aluminum. There is no domestic product standard or industry standard for Gr2 Pure Titanium Foil, and there is no monitoring data. After the introduction of the new national standard system for food contact materials, the metal materials and products for food contact are regulated according to GB 4806.9-2016 "National Food Safety Standard - Metal Materials and Products for Food Contact".

2. Relevant foreign laws and regulations

In foreign countries, the supervision of titanium alloy kitchen utensils is mainly included in the legal system of metal materials for food contact.

In the United States, the supervision of tableware, food processing equipment, and food and beverage dispensing equipment is mainly carried out in accordance with ANSI/NSF standards. In NSF/ANSI 51-2009 "Food Equipment Materials", the minimum public health and hygiene requirements are specified for the materials contacting food in the production and operation food equipment, and all "food area" materials are required to be free from intentionally added lead. , arsenic, cadmium, mercury composition.

According to the notice issued by the Ministry of Health, Labour and Welfare of Japan, the general requirements for metal materials for food containers and packaging are: when Ti 15V-3Cr-3Sn-3Al Titanium Strip design and manufacture utensils, copper, lead, or their alloys that can be scraped shall not be on the utensils.

At present, at the EU level, there is no legally binding special directive or regulation for metal materials and products in contact with food. The European Council "Partial Agreement in the Field of Social and Public Health" only published a technical guideline on metals and alloys in contact with food in 2002.

Application Prospect of Titanium Alloy in Petroleum Industry

Titanium alloys are widely used in petroleum. In terms of current economic alternatives, there are mainly the following aspects.

At present, titanium alloy drill pipes of P110 steel grade have been produced in China. Compared with conventional ordinary steel S135 drill pipes, its advantages are as follows:

The large-reach well and horizontal well can be extended farther, and the density of titanium alloy is only 4.5g/cm3. The conventional density of drill pipe with the same wall thickness and length is 1.25g/cm3. The floating weight in the horizontal section of the drilling fluid is only 49% of that of the steel drill pipe. In this case, the frictional resistance is only about 50% of the ordinary drill pipe, and the friction torque of the pipe string is one of the core problems of the extended-reach well technology, which determines the maximum extension of the horizontal displacement, so the titanium alloy drill pipe It can be more beneficial to extended-reach wells and three-dimensional cluster horizontal wells. In the current situation of more and more factory drilling in China, titanium alloy drill pipe is used in a wider range.

Reduce ground equipment load

Due to the light weight of the titanium alloy forged ring the torque is reduced by nearly 50%, which effectively reduces the load of the ground top drive (turntable), which greatly reduces the probability of such damage, and the reduction of the load will also reduce the consumption of diesel.

Reduce hydraulic losses in joints

Titanium alloy drill pipe is light in weight and low in torque, and the processed drill pipe joint does not need to be strengthened like steel drill pipe. Usually, when φ127mm S135 drill pipe is used in horizontal wells, the inner diameter of the joint is reduced from φ82.55mm of G105 drill pipe to φ69. 85mm, titanium alloy drill pipe due to the reduction of torque, 80 steel grade drill pipe can achieve the strength effect of S135 steel grade at the same displacement (due to the 51% reduction in floating weight, the torque will also be reduced by 51%). The inner diameter of the drill pipe joint of X95 steel grade reaches φ88.9mm. The increase in the inner diameter of the joint can significantly reduce the cycle pressure loss.

Compared with the aluminum alloy drill pipe, the titanium alloy drill pipe has very prominent advantages. The performance of the titanium alloy and steel drill pipe joints is very similar, so the joint and the body can be made of the same material. In general, although the aluminum alloy drill pipe also has the characteristics of light weight, because the aluminum alloy is not resistant to wear and has low strength, the joint needs to be strengthened, and the joint is usually made of steel material, which results in a limited reduction in the weight of the drill pipe. Moreover, there is still a certain gap between the strength of aluminum alloy and high-strength steel, which can only reach about 2/3 of that of a complete set of titanium drill pipes. In addition, the material hardness of the aluminum alloy drill pipe is low, which causes serious scratches and wear on the body when the drill pipe collides with the well wall, so it is difficult to use. The titanium alloy drill pipe can effectively avoid this problem because the hardness of the body can be close to that of the steel drill pipe.

Titanium alloy parts processing occupies an important position in the machinery manufacturing industry

Titanium alloy has the advantages of low density, high specific strength, good corrosion resistance and good process performance, and is an ideal aerospace engineering structural material. Titanium and its alloys are replacing traditional aluminum alloys in many aerospace applications. Today, the aerospace industry consumes about 42% of total global production, and demand for titanium is expected to continue growing at a double-digit rate between now and 2010. The need for next-generation aircraft to take full advantage of the properties offered by titanium alloys is driving demand for titanium alloys in both the commercial and military aircraft markets. New models such as the Boeing 787, Airbus A380, F-22 Raptor, and F-35 Joint Strike Fighter (also known as Lightning II) use a lot of titanium alloys. Advantages of titanium alloy materials Titanium alloys have high strength, high fracture toughness, and good corrosion resistance and weldability. With the increasing use of composite structures in aircraft fuselage, the proportion of titanium-based materials used in the fuselage will also increase, because the combination of titanium and composite materials is far better than aluminum alloys. For example: Compared to aluminum alloys, titanium alloys can increase the life of airframe structures by 60%.

Because titanium alloys are more difficult to machine than ordinary alloy steels, titanium alloys are generally considered to be difficult-to-machine materials. The metal removal rate of a typical titanium alloy is only about 25% of that of most common steel or stainless steel, so machining a Titanium Grade 2 Round Rod workpiece takes about 4 times as long as machining a steel workpiece. To meet the growing demand for titanium machining in the aerospace industry, manufacturers need to increase production capacity and therefore need a better understanding of the effectiveness of titanium machining strategies. The machining of a typical titanium alloy workpiece starts with forging until 80% of the material is removed to obtain the final workpiece shape.

With the rapid growth of the aviation parts market, manufacturers have felt powerless, and the increased processing demand due to the low processing efficiency of titanium alloy workpieces has led to a significant tension in the processing capacity of titanium alloys. Some leading companies in the aerospace manufacturing industry even openly questioned whether the existing machining capabilities could complete the processing tasks of all new titanium alloy workpieces. Because these workpieces are often made from new alloys, machining methods and tool materials need to be changed. Titanium alloy Ti-6Al-4V titanium alloy has three different structural forms: a titanium alloy, a-b titanium alloy and b titanium alloy. Commercially pure titanium and a titanium alloys cannot be heat treated, but usually have good weldability; a-b titanium alloys can be heat treated, and most of them are also weldable; b and quasi-b titanium alloys can be fully heat treated, and generally also have Solderability.

The machining of titanium alloy parts occupies a very important position in the machinery manufacturing industry, and the machining of titanium alloy materials has always been a difficult point in the current processing technology. In order to meet the increasing demand for titanium alloy workpieces in aerospace, my country's titanium alloy cutting must make great progress. On the basis of domestic materials, machine tools and management conditions, it is important to further strengthen the optimization of the processing route of titanium alloy materials, the selection of processing parameters, and the improvement of processing efficiency and product quality, which are important to promote the development of the domestic titanium alloy industry and aerospace industry. factor. The inner cavity cylindrical surface finishing boring tool designed in this paper has a simple structure, is very convenient to manufacture and use, and solves the processing technology problem of the ball ring frame parts.

Problems Existing in the Processing of Titanium Alloy Fasteners

Corrosion problem. When installing titanium alloy fasteners, it is easy to form a certain gap, so that there will be surface paint inflow between metal air strikes, resulting in the fasteners being vulnerable to clothing during the production process. During subsequent use, the connection tightness will be affected. The main reason for the corrosion resistance of titanium alloy materials is that there is a protective oxide film on the surface. This film can effectively protect the titanium alloy inside the material from being oxidized, thereby improving the corrosion resistance of the titanium alloy material.

Problems in turning. Titanium alloy materials are difficult to process materials and have poor thermal conductivity. The heat generated during machining does not diffuse through the part and machine structure, but is concentrated in the cutting area, where there is a strong notch sensitivity, which can lead to chipping and deformation; and dull cutting edges can generate even higher heat And further reduce the tool life. The high temperature generated during cutting will also cause the workpiece to harden continuously, which will affect the surface integrity of the titanium and may lead to inaccurate geometric accuracy of the part and severely reduce its fatigue strength. Generally speaking, in In reasonable machining conditions, the turning process is not difficult. If it is for mass production, continuous cutting, and cutting with a relatively large amount of metal removal, carbide tools need to be used; while forming cutting or cutting requires steel tools. Make reasonable adjustments and use cermet cutters if necessary.

Precision issues in machining Titanium Flat Washers. The precision requirements for machinery will be higher. In mechanical production, because the tool is in a state of working wear during each production process, and it is calibrated according to the program, the density of titanium alloy fasteners is higher, and the tool is easily worn during the machining process. Under the state, the tool is still processed according to the program, and it is easy to cause the precision of the compact part to be affected during the processing. If the precision of the fasteners is not strictly controlled within the error range during the entire processing process, the titanium alloy and other materials cannot be tightly connected during the use process, which will have a certain impact on the subsequent use and improve The precision of titanium alloy fasteners in the machining production process is a major problem that needs to be overcome in the production process. For example, the fastener process product shown in the figure is a product made in a high-precision production workshop, and the connection performance of this product is better.

Pipe cutting and beveling of titanium pipes!

With the continuous expansion of the application field of titanium tube, the consumption is also rising. Our titanium tubes have been used in construction, in order to make construction more scientific, we can provide users with high-performance titanium tubes.

Research on refractory materials for casting molds has always been linked to the crucible materials for smelting titanium tubes and titanium alloy tubes. Based on kinetic reasons, the crucible materials need to be in contact with the titanium liquid for a long time during smelting, and the titanium liquid and the titanium liquid are in contact with each other for a long time. The contact time of the holding material is much shorter, so the available crucible material can be used as a mold material for titanium alloy pipes.

Materials that have been studied include carbides, nitrides, borides, sulfides, oxides, rare earth oxides, fluorides, oxyfluorides, sulfur oxides, and refractory metals such as W and Mo. Only very few materials have high chemical stability to titanium liquid, including ThO2, certain rare earth oxides, TaB2, Npc, some rare earth sulfides and some rare earth oxyfluorides.

Pipe cutting and beveling processing of Grade 2 Pure Titanium Tube; pipe cutting and beveling processing should be carried out by mechanical processing methods in special workplaces. When processing, use clean water with non-polluting medium for cooling to prevent oxidation. Processing tools should be dedicated and kept clean to prevent iron contamination. The processed nozzle should ensure that the surface is smooth and free of defects such as cracks and heavy skins. The maximum inclination deviation of the cut plane shall not exceed 1% of the pipe diameter.

Introduction to the application of titanium alloy materials in the military industry!

Most of the aircraft materials in the world are made of titanium alloy, but the structure of the aircraft using titanium alloy is more stable, which greatly reduces the weight of the aircraft and increases its stability of the aircraft.

Titanium rods and titanium alloys have the characteristics of low density, high strength, high-temperature resistance, and low-temperature resistance. Titanium and titanium alloys are essential materials for the military industry. For example, the American f-22 can conduct supersonic cruise flights for a long time. The point is to lose weight while maintaining your own strength. Without titanium, the fighter's long-range combat capability is greatly reduced. titanium sheet metal

On the naval side, titanium alloys can help submarines penetrate deep into the sea without being crushed by powerful seawater. For example, Russia's "Serra" class nuclear submarines are made entirely of titanium alloy and can dive to 600 meters, which makes Western submarines intimidating. Of course, it is also expensive because of the large-scale use of titanium alloys, known as "goldfish". In addition, titanium is non-magnetic, and warships made of titanium alloys can effectively resist magnetic mines and have strong corrosion resistance.

Five flaw detection methods for titanium materials----ultrasonic flaw detection

The frequency range of sound waves that people's ears can directly receive is usually 20Hz to 20kHz, that is, the sound (sound) frequency. The frequency below 20 Hz is called infrasound, and the frequency above 20 kHz is called ultrasonic. In industry, ultrasonic waves of several megahertz are commonly used for flaw detection. When the ultrasonic frequency is high, the propagation linearity is strong, and it is easy to propagate in solids, and it is easy to reflect when it encounters the interface formed by two different media, so it can be used for flaw detection. Usually, the ultrasonic probe is in good contact with the surface of the workpiece to be detected, and the probe can effectively transmit ultrasonic waves to the workpiece and can receive the ultrasonic waves reflected from the (defect) interface, convert them into electrical signals, and then transmit them to the instrument for processing. According to the speed of ultrasonic propagation in the medium (often called the speed of sound) and the propagation time, the location of the defect can be known. When the defect is larger, the reflecting surface is larger, and the reflected energy is larger, so the size of each defect (equivalent) can be checked according to the size of the reflected energy. Commonly used flaw detection waveforms include longitudinal wave, transverse wave, surface wave, etc. The former two are suitable for detecting internal defects, and the latter is suitable for detecting surface defects, but they have high requirements on surface conditions. 6al4v titanium sheet

Titanium Clad Copper Plate

Titanium Clad Copper Plate: 

Technique: Rolled, Extrude, Explosive Cladding
Sheared Strength: ≥130 Mpa
Compact Rate: ≥98%
Clad Material: Ti
Base Material: Copper
Size: Custom sizes are available

Introduction of titanium and titanium alloy powder

titanium alloy powder generally includes three aspects, namely purity, particle size and particle shape. The purity of titanium powder is related to its particle size. For products of the same specification, the smaller the particle size, the lower the purity. Titanium powder particle size is divided into 4 grades, the particle size of 1000-50pm is coarse powder, 50-10pm is fine powder, 10-0.5pm is fine powder, and less than 0.5pm is ultrafine powder. In graded products, except for the requirements of special purposes, it is generally graded by oxygen content, that is, the lower the oxygen content, the better the quality and the higher the grade. Those with an oxygen content of less than 0.15% are high-quality titanium powders.

Specifications: 10 mesh, 20 mesh, 30 mesh, 35 mesh, 36 mesh, 40 mesh, 50 mesh, 60 mesh, 80 mesh, 100 mesh, 120 mesh, 150 mesh, 160 mesh, 180 mesh, 250 mesh, 300 mesh , 325 mesh, 350 mesh, 400 mesh

Physical properties: Titanium powder is dark gray amorphous powder, boiling point ≤3000℃, melting point 1668℃±2℃, insoluble in water and organic solvents at room temperature. It is a non-magnetic metal, it will not be magnetized in a large magnetic field, and it is non-toxic and tasteless, and has good compatibility with human tissue and blood.

Chemical properties: It does not interact with water, dilute sulfuric acid, dilute hydrochloric acid and nitric acid at room temperature, but can be etched by hydrofluoric acid, phosphoric acid, and molten alkali. Titanium is soluble in hot hydrochloric acid and hot sulfuric acid, and also soluble in hydrofluoric acid. Or in a mixture of hydrofluoric acid and hydrochloric acid (sulfuric acid). Titanium powder will increase the content of N, H, O, and C in the atmosphere. May explode if mixed with strong oxides.

Titanium powder has good corrosion resistance and is mostly used in aerospace industry, chemical corrosion-resistant materials, electric vacuum materials, alloy additives, etc. Titanium powder refers to titanium metal powder with a size of less than 1mm and an irregular shape, usually black and gray. Titanium powder has a large surface free energy. Therefore, it is more active than metal titanium blocks, and it is easier to react with other elements or compounds, resulting in oxidation, combustion and explosion. It is a dangerous product. Its purity and properties largely depend on the preparation method and its process conditions.

The main application areas of titanium in the chemical industry

1. Chlor-alkali industry

The earliest titanium in the chemical industry, the user is the chlor-alkali industry. These include the production of chlorine gas, oxychloride, pesticides, drift powder, etc., in the production of chlorine, titanium equipment and pipes account for almost a quarter of its total mass'. Such as metal anode electrolyzers, ion membrane electrolyzers and anolyte pumps, tubular wet chlorine coolers, chlorine wastewater dechlorination towers, chlorine cooling scrubbers, refined brine preheaters, pumps and valves for vacuum dechlorination, etc. .

2. Soda ash industry

In the production of soda ash, titanium materials are mainly used in the crystallization external cooler, the ammonia condenser at the top of the distillation column, the ammonium chloride mother liquor heater, the plate heat exchanger, the umbrella plate heat exchanger, the cooling pipe of the carbonization tower, and the carbon dioxide turbine compressor. Rotor impeller, lye pump, etc.

3. Vacuum salt industry

Titanium ammonia evaporator, titanium preheater, titanium precooler, titanium flange, titanium tube sheet, titanium pump casing and titanium elbow.

4. Petrochemical fiber

At present, petrochemical fiber enterprises such as polyester, nylon and vinylon, which are imported from abroad or domestically designed and manufactured by themselves, have used some titanium equipment. The application of titanium equipment has played a positive role in the development of chemical fiber production in my country, especially for safe, stable and continuous production, to improve product quality, to prevent premature corrosion and failure of stainless steel, to improve equipment service life, to reduce downtime and maintenance, and to improve comprehensive economic benefits. made a significant contribution.

5. Fine chemical industry

The industrial raw material of propylene oxide plant is a strong corrosive medium. The two main raw materials used in PO production are liquid chlorine and propylene. These strong corrosive media lay the foundation for corrosion of PO production equipment and pipelines. Production under this process conditions, such as carbon steel, Al, Cu, Ni, stainless steel, etc. No metal can resist corrosion, only titanium is an ideal corrosion-resistant metal material. Grade 3 Pure Titanium Foil

6. Inorganic salt industry

Inorganic salts mainly include chlorate and potassium salts. Domestic sodium chlorate production has developed rapidly in the past two years. The total production capacity has exceeded 1 million tons, and another about 500,000 tons is under expansion or preliminary work. The equipment made of titanium chlorate mainly includes electrolytic cells, titanium anodes, and reaction generators. , evaporator, etc., about 15t of titanium material is needed for every 10,000 t of sodium chlorate.

Potash products include potassium chloride, potassium sulfate, potassium nitrate, potassium carbonate, etc. At present, the total production capacity of potassium nitrate and potassium carbonate in China is about 600,000 tons. Evaporators, preheat tanks and coolers in the production of potassium nitrate and potassium carbonate require titanium equipment.

Application of Molybdenum Sputtering Target

In the electronics industry, molybdenum sputtering targets are mainly used for flat panel displays, electrical and wiring materials for thin-film solar cells, and barrier materials for semiconductors. These are based on molybdenum's high melting point, high electrical conductivity, lower specific impedance, better corrosion resistance, and good environmental performance.

In the past, the wiring material for flat-panel displays was mainly chrome, but as flat-panel displays increase in size and precision, materials with lower specific impedance are increasingly required. In addition, environmental protection is also an issue that must be considered. Molybdenum has the advantage of only 1/2 of the specific impedance and film stress of chromium, and there is no environmental pollution problem, so it has become one of the Sputtering Target materials for flat panel displays. In addition, the use of molybdenum in LCD components can greatly improve the performance of LCDs in terms of brightness, contrast, color and life.

In the flat panel display industry, the main market application of molybdenum sputtering targets is the TFT-LCD field. Market research shows that the next few years will be the peak period of LCD development, with an annual growth rate of about 30%. With the development of LCD, the consumption of LCD sputtering targets has also increased rapidly, with an annual growth rate of about 20%. In 2006, the demand for spherical molybdenum sputtering targets was about 700t, and in 2007, it was about 900t.

In addition to the flat panel display industry, with the development of the new energy industry, the application of molybdenum sputtering targets in thin-film solar photovoltaic cells is also increasing. The molybdenum sputtering target is mainly used to form the electrical layer of the CIGS copper indium gallium selenide) thin-film battery by sputtering. Mo is located in the bottom layer of the solar cell, and as the back contact of the solar cell, it plays a very important role in the nucleation, growth and morphology of the CIGS thin-film crystals.

Reasons for high strength and low density of titanium alloy screws

titanium metric screw have the characteristics of low density and high strength, and are generally used in places where weight and strength are required, but titanium alloy screws are not high-strength materials.

The high strength of titanium alloy screws is relative to steel screws. The density of titanium alloys is between 50% and 60% of steel, but the strength is equivalent to steel.

The hardness of the titanium alloy itself is very low, but the strength of the titanium alloy is very good, so the elastic modulus of the whole material is very small, and the small elastic modulus means the elasticity is large. In addition to the hardness of titanium alloy itself is higher than that of stainless steel, the weight of the finished product is much lighter than that of ordinary stainless steel screws. The wear resistance of titanium alloy screws and nuts is higher than that of ordinary stainless steel. The material stability of the alloy itself is also high and has good oxidation resistance.

Application of titanium valve in aerospace field and its materials

The high strength and low density of titanium and titanium alloys provide a broad space for their wide application in the aerospace field. Titanium alloys and their valve products are widely used in the aerospace field. Only in terms of the types of valves used, they mainly involve regulating valves, needle valves, etc., and more small-sized and non-standard design valves are mainly used. In the aviation field, the application of titanium alloy and its valve products is not only wide but also huge. Titanium alloy valves are widely used in various pipelines on aircraft. The types of valves involve regulating valves, globe valves, check valves, needle valves, plug valves, ball valves, butterfly valves, etc. The titanium materials used for valves include pure titanium ( Such as ASTMB367C2) and titanium alloy Ti-6AI-4V (ASTMB381F5), Ti-6AI-6V-2Sn, Ti-6A1-2Sn-4Zr-2Mo, Ti-6A1-2Sn-4Zr-6Mo, etc., but pure titanium and Titanium Threaded Forged Fitting Ti-6A1-4V is more common. The titanium valve used in the aviation field uses Ti-6AI-4V as its fastener material in the United States, and BT16 in Russia.