Development and application of domestic medical titanium alloys and new titanium alloy materials

The surface treatment of titanium plates and titanium alloy plates has always been a problem that plagues various titanium manufacturers. With people’s deepening understanding of titanium, the processing technology has also been greatly improved.

After plasma nitriding (nitriding) of titanium plate and titanium alloy plate, its surface hardness, wear resistance and corrosion resistance in reducing media are greatly improved, and the original excellent comprehensive performance of the matrix is ​​maintained . In terms of plasma nitriding, my country's Guangzhou Research Institute of Nonferrous Metals has made remarkable achievements. For example, the bath heating coil used in hydrometallurgy, using ion-nitriding titanium alloy coil, is safe and has a long life. Another example is the neutralization pot stirring shaft sleeve of the key equipment for chemical extraction of phenol, which requires good sealing performance. The ion titanium nitride shaft sleeve is used to ensure the sealing performance, stable and normal production, and the safe operation time is extended by more than 10 times. For another example, the valve core and valve seat on the desulfurization lye circulation pipeline are made of 1Cr18Ni9Ti material and will be damaged after 18 days of use. The pneumatic valve core and valve seat using ion titanium nitride valve core have been used for more than three years and are still intact.

In natural gas exploitation, the high-pressure anti-sulfur gas production wellhead device is a high-pressure equipment that controls natural gas production. The key components of the wellhead flat valve sealing part, the valve plate and valve seat, require long-term work under high pressure (10~67MPa), and a short-term endurance of 30 ~80MPa pressure can be safe and reliable, open and close flexible, and resistant to acid media corrosion. In addition, the surface hardness of the material is required to be greater than 45HRC, strong abrasion resistance, high-speed air erosion resistance, high specific pressure abrasion resistance, low friction coefficient, low sealing specific pressure and other comprehensive properties. Choose titanium alloy TC4 and TA7 to manufacture flat valve sealing parts, and perform ion nitriding treatment to solve this problem
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Why do we need hardness requirements for titanium screws?

Titanium tube is similar to other metals. The shrinkage behavior of titanium tube during casting also undergoes a change from liquid to solid state and then to solid state. This shrinkage behavior is usually divided into volume shrinkage and linear shrinkage. The volume shrinkage reflects the change of the entire volume of the titanium tube during the casting process. Since the total volume shrinkage is equal to the volume of the concentrated shrinkage cavity of the casting plus the volume of the shrinkage porosity, the solidification shrinkage behavior of the alloy casting process is related to the volume shrinkage of the alloy. It determines the characteristics of shrinkage cavity and shrinkage porosity of the drill alloy, which is of great significance for understanding the formation of shrinkage cavity and shrinkage porosity defects of titanium pipes.

Titanium tube

Important factors affecting the solidification and shrinkage of titanium tubes include alloying elements, mold materials and mold structures. Because alloying elements affect the crystallization temperature interval of the titanium tube, just like its influence on fluidity, the solidification shrinkage of the titanium tube first depends on the characteristics of the added alloying element, that is, the crystallization temperature formed between titanium and alloying elements The size of the interval is related. Eutectic titanium tubes with narrow crystallization temperature intervals have good fluidity and are easy to form concentrated shrinkage cavities, while titanium tubes with wide crystallization temperature intervals have poor fluidity and are easy to form dispersive shrinkage cavities, that is, shrinkage porosity.

Because titanium tube has a series of good physical properties, as an excellent structural material, it can compete with stainless steel and nickel alloy for the scope of application: in many sectors of the national economy, the use of titanium tube increases product life and improves The reliability and productivity of the equipment speed up the process and improve the working conditions, all of which have achieved significant economic benefits.
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What are the common specifications of titanium screws?

1. A self-control butterfly valve that can be remotely controlled, which also has the characteristics of a flanged butterfly valve, and can be equipped with a wide range of butterfly valves;

2. The power source is the driving energy of the butterfly valve, with a wide range of power sources, a wide range of applications, saving human resources, and working efficiency;

3. Convenient operation, easy to meet various control requirements, it can be realized by selecting different actuators, signal feedback, flow adjustment, explosion-proof and other functions;

4. It can realize ultra-miniaturization, realize mechanical self-locking and change different sealing rings to meet different working conditions.

Working principle of flange:

Using the actuator to input a standard signal of 0-10 mA, the motor unit drives the gear worm and the gear to drive the disc to rotate. When the valve is in the fully open position, the thickness of the butterfly plate is the resistance of the medium flowing through the valve body.

Therefore, the pressure drop produced by the valve is very small, so it has better flow control characteristics.

The butterfly valve has two sealing types: elastic seal and metal seal. Resilient sealing valve,

The sealing ring can be inlaid on the valve body or attached to the periphery of the butterfly plate. The valve with a metal seal generally has a longer life than the valve with an elastic seal.

But it is difficult to achieve a complete seal. The metal seal can adapt to higher working temperatures, while the elastic seal has the defect of being limited by temperature. If the flange butterfly valve is required to be used as flow control, The main thing is to correctly choose the size and type of the valve.
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How to prevent moisture and moisture from titanium screws?

Titanium is a modern metal. The history of titanium can be traced back to 1795, when the German chemist Klaprus first discovered this new element and named it. By 1948, relevant American scholars began to extract a large amount of sponge titanium with the help of magnesium reduction method, and then titanium metal began to be widely used in industrial fields.

From the beginning of the last century, many scholars began to use titanium as a source of artistic creation, and it spread quickly among developed countries. During this period, people's basic research on titanium metal has become increasingly sophisticated, and titanium metal has begun to be applied to jewelry materials. However, during this period, the application of titanium in the fields of craft gifts, utensils and construction still needs to be strengthened. In my country, the application of titanium in arts and crafts is almost in a blank state, and the research on coloring is still very scarce.

With the continuous improvement of titanium metal processing technology, the application of titanium metal in arts and crafts will inevitably become more and more extensive. And titanium metal has many characteristics, namely: low density, strong affinity, not easy to corrode, color change, etc., which makes its application prospects in the field of art very broad.

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How to deal with casting defects of titanium screws?

The titanium alloy forgings used on the space shuttle mainly include: high-pressure vessels, wing leading edges, oil pressure pipelines, engine thrust brackets, etc.

①High pressure vessel.

The pressure vessel used on the space shuttle must withstand a high pressure of (2.1~3.5)×10Pa. The wall of the vessel is actually a composite structure, which uses titanium as the substrate and is reinforced with aromatic organic fibers. The fiber applies a pre-stress (compressive stress) to the titanium substrate. This structure can make the pressure vessel weigh 35% lighter than a single-layer all-titanium vessel. Both the container material and its welding wire use Ti6Al4V alloy.

② Wing.

The maximum temperature of the front edge of the wing can rise to 538℃, which is unbearable by aluminum alloy, and the FeNi-based alloy is too heavy, so Ti6Al-4V alloy is used. The wing is fixed on the wing supporting structure with the same fixture mechanism, and the fixture also uses Ti6Al4V alloy.

③Hydraulic piping.

There are a large number of hydraulic pipelines on the space shuttle, and T3A2.5V alloy seamless pipes are used for piping, which can reduce the weight of the pipeline by 40%.

④ Engine thrust bracket.

At the back of the space shuttle, there is a thrust bracket supporting three main engines (Figure 29), through which 510t of thrust can be transmitted to the space shuttle. The thrust bracket is made of high-strength titanium alloy, and at the same time, boron epoxy resin is used for composite on its surface. The specific elastic modulus of boron epoxy resin is higher than that of Ti6A4V alloy, but the thermal expansion coefficient of the two is similar. The boron epoxy resin composite layer can improve the rigidity of the thrust member.

⑤Other parts.

Due to the high specific strength of titanium, titanium materials are used in the space shuttle for the rear elevator fixture, external container fixture, the upper part of the frame/tail conversion device, and the sealing fins on the upper surface between the wings and elevons.
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Types and advantages of titanium screws?

1. Titanium alloy has good heat resistance, low temperature toughness and fracture toughness, so it is mostly used as aircraft engine parts and rocket and missile structural parts. Titanium alloy can also be used as fuel and oxidant storage tanks and high-pressure vessels. Titanium alloys have been used to make automatic rifles, mortar seat plates, and launch tubes for recoilless rifles.

2. In the petroleum industry, it is mainly used for various containers, reactors, heat exchangers, distillation towers, pipelines, pumps and valves.

3. Titanium can be used as electrode and condenser of power station and environmental pollution control device.

4. Titanium-nickel shape memory alloys have been widely used in instruments and meters.

5. In medical treatment, titanium can be used as artificial bones and various appliances.

Sixth, titanium is also a deoxidizer for steelmaking and a component of stainless steel and alloy steel.

7. Titanium dioxide is a good raw material for pigments and paints.

8. Titanium carbide and titanium hydride are new cemented carbide materials.

9. The color of titanium nitride is close to that of gold, and it is widely used in decoration.
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What are the welding functions of cutting titanium plate

As a rare metal element, titanium's performance is far beyond what we have seen. General power generation equipment, especially the side with a lower thermal cycle temperature, provides an ideal environment for titanium.

It is possible to develop a new type of titanium tube that can be used at a higher working temperature. Compared with the high-strength low-temperature titanium tube that has been developed, it will have greater potential in saving metal and improving efficiency. The goal is to develop a titanium tube that can be used at a temperature of 650°C. This alloy can be used on high-pressure turbine wheels and can reduce weight by 20% compared to the commonly used base wheels.

However, with the increase of working temperature, titanium tubes will inevitably bring more new problems, such as surface oxidation, long-term stability of mass metallurgical production, friction corrosion, fire hazard, and hot salt stress corrosion. Some problems can be solved by surface coating or surface treatment. For this reason, research in this area is currently being actively carried out.

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How to choose the reducing agent of titanium rod

With the increasing amount of titanium alloy materials on various power systems, the surface protection of titanium alloy parts during processing becomes particularly important.

Titanium alloy has good specific strength, high heat resistance, excellent corrosion resistance and low density. It has been widely used in aviation, aerospace, ship and chemical industries. Especially in the power system, a large number of titanium alloy materials are used, which has far-reaching significance for reducing the weight of the system and increasing the thrust-to-weight ratio.

What are the protection requirements for titanium alloys during machining? The following titanium alloy machining parts manufacturers introduce a few points:

(1) When cutting titanium alloy parts, machine tools and tools with good rigidity, and special tooling with low vibration and strong rigidity should be used. The special tooling for titanium alloy parts is not allowed to have active metal coatings such as zinc plating and cadmium plating to prevent the organization of titanium alloy parts from being exchanged with the tooling due to electrochemical corrosion and to prevent the cadmium brittleness of the titanium alloy. Choose suitable tooling to minimize the processing stress of titanium alloy parts and avoid deformation.

(2) When processing titanium alloy, use a lower cutting speed, sharp tool, and take a big knife. However, the tool is not allowed to stop during the machining process. At the same time, choose the specified halogen-free coolant to prevent the surface of the titanium alloy from being overheated and sticking to the knife, which may cause the problem of tearing the metal and deteriorating the surface of the part.

The sticking of the knife is mainly caused by the chemical affinity of the titanium alloy and the tool material. The use of a chloride-free coolant can not only prevent overheating, but also have a certain lubricating effect, reduce the phenomenon of tearing, and extend the use of the tool. life.

(3) Titanium alloys are prone to cold work hardening. Therefore, the depth of the cut should exceed the thickness of the cold work-hardened layer produced during the previous cutting. The tool should have both anti-wear ability and high thermal hardness. The machining depth should be ensured by controlling the rigidity of the lathe, the tool, and the clamping degree of the parts.

(4) When milling titanium alloy parts, it is recommended to use high-speed steel multi-edge milling cutters embedded with cemented carbide. Disc milling cutters should adopt down-milling technology. When reverse milling, the stability of the milling cutter is reduced by half so that the finish of the processed surface will have severely deteriorated.
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Do you know the corrosion forms of titanium rods?

Titanium alloy materials such as titanium rods and titanium plates have high specific strength, good corrosion resistance, and satisfactory comprehensive performance and processing performance, making them very dynamic structural materials in the military and civilian fields after the 1950s. In the aerospace field, titanium alloy materials are mainly used as structural parts of aircraft engines: compressor discs, blades, drums, air ducts, compressor casings, high-pressure compressor rotors, shafts, aircraft landing gear, bulkheads , Shell, skin, etc. In civilian use, golf heads, artificial joints, civilian bicycles, various titanium containers (pressure vessels, chemical, electroplating baths), etc. have also entered people's lives. The market application prospects of titanium materials such as titanium rods, titanium plates, and titanium tubes can be subdivided into:

1. Technology:

Forming and powder metallurgy technology, corrosion-resistant titanium alloy, high-temperature titanium alloy, high-strength and high-toughness titanium alloy, new processing technology, new technology, coating technology, sponge titanium preparation technology, functional and medical titanium alloy, titanium-based composite material, titanium welding Technology, etc.;

2. Equipment category:

Mineral processing equipment, metallurgical equipment, smelting equipment, casting equipment, welding equipment, processing equipment, heat treatment equipment, special processing and forming equipment, instrumentation, etc.;

3. Basic categories:

Titanium ore, titanium sponge, titanium powder, plates, bars, wires, cakes, rings, pipes, strips, foils, capillaries, various alloys, etc.;

4. Application category:

①Reactors, autoclaves, heat exchangers, evaporators, filters, condensers, radiators, reaction towers, fractionation towers, regeneration towers, rectification towers, washing towers, pipe pump valves, standards used in the petrochemical industry Pieces and other titanium products;

② Titanium products such as compressor plates, high-pressure vessels, blades, casings, brackets, landing gears, ducts, doors, and tie rods used in the aerospace industry;

③Sports and leisure products and crafts: golf heads, bicycles, model airplanes, rackets, climbing equipment, glasses, watches, jewelry, tableware, etc.;

④Various titanium alloy pipe pump valves, evaporation tanks, heat exchangers, circulation tanks, etc. used in the salt industry;

⑤Titanium products such as condensers, condensers, tube sheets, cold oil pipes, and turbine blades in the power industry;

⑥ Titanium materials used in the shipbuilding industry to manufacture pressure hulls, structural parts, buoyancy spheres, propellers, propulsion shafts, pipe pump valves, etc.;

⑦Titanium teeth, heart valves, diaphragms, stents, bone joints and fixation screws, titanium bones, titanium surgical instruments and other medical titanium products used in the medical industry;

⑧ Various titanium alloy decorative materials used for high-level decoration in the construction industry;

⑨ Titanium products used in metallurgy, electromechanical, weapons, automobiles, and textile industries.

5. Science and technology publications, titanium technology reference books, etc.

With the continuous expansion of the scope of application of titanium alloys and the increasing usage, it will surely promote the new progress of the titanium industry and bring about the era of titanium alloys in the research and development of new materials and industrial production applications.
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