Can titanium alloy be used as jewelry?

Titanium alloy plates and titanium plates are mainly used to manufacture various containers, reactors, heat exchangers, distillation towers, pipes, pumps and valves in the petrochemical machinery manufacturing industry. Titanium can be used as a titanium cathode and condenser in power stations, as well as environmental pollution control devices. The hardness of steel is higher than that of titanium plate, but the specific strength or tensile strength of titanium alloy is higher than that of high-quality steel. 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. There are already automatic rifles, mortar seat plates and recoilless gun launch tubes made of titanium alloy.

1. Memory function

Titanium-nickel alloy has one-way, two-way and omnidirectional memory effects at a certain ambient temperature, and is recognized as the best memory titanium alloy. Pipe joints are used in engineering for the hydraulic system of fighter jets; the oil pipeline system of a petroleum joint enterprise; a parabolic mesh antenna with a diameter of 500mm made of 0.5mm wire is used on aerospace vehicles; used in medical engineering to make snoring Treatment; Titanium plates are made into screws for fracture healing. The above applications have achieved obvious results.

2. Superconducting function

The niobium-titanium plate exhibits a zero-resistance superconducting function when the temperature is lower than the critical temperature.

3. Hydrogen storage function

Titanium-iron alloy has the property of absorbing hydrogen, which can store a large amount of hydrogen safely, and release hydrogen in a certain environment. This is very promising in hydrogen separation, hydrogen purification, hydrogen storage and transportation, and the manufacture of heat pumps and batteries that use hydrogen as energy.

Titanium dioxide, the oxide of the titanium plate, is a white powder and a better white pigment, commonly known as titanium white. In the past, the main purpose of mining titanium ore was to obtain titanium dioxide. Titanium white has strong adhesion, is not easy to undergo chemical changes, and is always white. Especially valuable is that titanium dioxide is non-toxic. It has a high melting point and is used to make refractory glass, glaze, enamel, clay, high-temperature resistant laboratory utensils, etc.

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Characteristics of titanium plate

The rolling process of titanium alloy bars is mainly by cooling the forging bar stock of larger specifications after rolling. The cooled bar mainly takes the form of needles, thin flakes or coarse flakes. Titanium alloy rolled billets can have strong toughness and tensile properties after rolling and cooling, but the titanium alloy bars at this time do not have the characteristics of high strength and high plasticity. Generally, industrial production requires the processing of titanium alloy bars to form an equiaxed structure with strong tensile and fatigue properties. However, in the actual rolling process, because the billet is cooled at room temperature, the comprehensive performance of the flake structure is restricted, and only through targeted deformation treatment can it be shafted, which is suitable for market demand. Therefore, the axisization of titanium alloy bar billets during the rolling process is an important issue. If the rolling deformation is large, it is easier to improve the structural variability and mechanical properties. When the deformation is small, it will affect the plasticity and strength of the titanium alloy. At the same time, in the rolling process of titanium alloy bars, it is necessary to perform multiple annealing. In this case, the surface temperature of the rolled piece will be rapidly reduced. Bad hair, and easily cause surface cracks. Therefore, the rolling temperature must be properly controlled. The pass becomes a rolling space for temperature control and continuous deformation. Only by recrystallizing a large number of twins can the comprehensive properties of titanium alloy bars be effectively improved.

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Titanium plate manufacturing process

Ti55531 alloy is a new type of high-strength and high-toughness β-type alloy with a nominal composition of Ti-5AI-5V-5Mo-3Cr-1Zr. The alloy has good hardenability and a wide range of processing technology and is particularly suitable for manufacturing parts that must withstand huge stress. It is more suitable for connecting devices between structural parts and landing gear, wings, and engine pylons. It is increasingly popular in the aerospace industry and is now used on A380 Airbus aircraft. Compared with the traditional near-beta alloy Ti-1023, the alloy has low smelting and processing costs, does not produce obvious component segregation, and has the advantages of excellent strength and high fracture strength, and gradually replaces Ti-1023.

At present, there have been many studies on the heat treatment process of the alloy bars, but the heat treatment of the plates has not been studied yet. The orthogonal test method is used to optimize the heat treatment process of the alloy plate, and the best heat treatment process is determined, which provides a basis for the production of the plate.

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Design and development of Ti2448 titanium alloy

Titanium alloys can be roughly divided into low-strength titanium alloys, ordinary 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 alloys. Other titanium alloys used for structural parts are called structural titanium alloys.

2. Ordinary strength titanium alloy (~500MPa), mainly including industrial pure titanium, Ti-2AL-1.5Mn (TCl) and Ti-3AL-2. 5V (TA18) is a widely used titanium alloy. Due to its high cost performance and good weldability, it is used to manufacture various aviation sheet parts and hydraulic pipes. It is also often seen in civilian products such as bicycles.

3. Medium-strength titanium alloy (~900MPa), typically Ti-6AI-4V (TC4) titanium alloy, which is widely used in aerospace and other industrial fields.

4. High-strength titanium alloy, whose tensile strength at room temperature is above 1100Mpa, is composed of nearly β titanium alloy and metastable β titanium alloy, and is mainly used to replace the commonly used high-degree structural steel in aircraft structures. Its typical alloys There is Ti-13V-11Cr-3AI. Ti-15V-3Cr-3Sn (TB5), Ti-10V-2Fe-3AI.

Titanium alloys of different strengths are very different in terms of price and performance. During the selection process, customers need to choose the appropriate strength titanium alloy according to the actual use environment.

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The application of titanium rods on watches

When the world began to produce titanium tube parts, it once encountered a lot of problems. They are mainly metalworkers and technicians who are familiar with aluminum tube parts, but they are not very comfortable with titanium tube forming. First of all, the cutting and trimming process is too fast because the blades of the scissors wear out too quickly. When the shape is adjusted, the hammerhead is very easy to be arrogant. During the knocking process, the clock rebounds very high. Stick to the model. Because of this, everyone refers to titanium as a difficult-to-form material, and industry personnel call it a hot forming material. This is a more general and perceptual evaluation of the forming performance of titanium tubes. But this can't affect people's specific analysis, after understanding its characteristics, in order to make appropriate treatment.

To be precise, titanium not only has the disadvantages of particularly large spring back, but also has significant advantages. For example, in 1970, in the room temperature technical depth test of pure titanium pipes, it successfully processed cylindrical parts with a limit drawing coefficient of 2.75. , Which greatly exceeds the record of heavy materials such as steel, steel and aluminum. Tests carried out as early as 10 years ago have achieved better results, and also used conventional drawing models and other materials to process spherical parts with a height exceeding the radius in a single process. It laid the foundation for the development of our current titanium industry.

Ships will definitely be corroded in seawater, seriously affecting their life span. Then improving the corrosion resistance of the hull has become the first goal of many shipbuilding companies. So what should I choose? If the flow velocity in the cooling water pipe of the hull is relatively high and needs to withstand strong impact and corrosion, titanium pipes should be selected for comparison.

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Drawing process of titanium rod and titanium wire

Titanium alloy screws are not a high-strength material. It has high specific strength. The density of titanium alloy screws is about 50% to 60% of that of 45# steel, but the strength is equivalent. Titanium alloy screws not only have high strength but also have good heat resistance and low-temperature resistance. Titanium has good corrosion resistance to salt, seawater and nitric acid. It is a well-deserved space and ocean metal.

The development trend of my country's titanium industry is very fierce, and it has become a major country in the development of titanium production. The overall output of titanium screw products in my country has shown an increasing trend year by year, and titanium alloy screw materials are also widely used in machinery and equipment, electronic equipment, communication equipment, hardware lighting, construction bridges and other industries, and gradually entered the civilian field. Products usually made of materials are almost used to take advantage of the low density of titanium screws, usually in places where density requirements and weight requirements are combined.

Regarding the phenomenon of titanium screw sliding wire, we sometimes encounter the situation of titanium alloy screw overflow buckle, also called sliding wire. Commonly used on bicycles are the threaded holes of aluminum parts such as stems, cranks, and rod clamps. Titanium screws It's as good as a pedal axle. The perfect repair method is to ream and tap the titanium screw sleeve, but this process is troublesome and costly. In some places, the size is not rich and cannot be reamed. If you encounter a titanium screw thread overflow buckle, cut a short coil spring, fold the head, put it in the screw hole of the overflow buckle, and screw the titanium alloy screw directly into it. Basically, the original aluminum screw hole can be restored. Tight torque, and can be repeatedly disassembled and assembled, and the reed will not fall out. When screwing, you can choose different width coil springs according to the size of the titanium alloy screw hole, or put two coil springs into the titanium alloy screw hole. The possible ways to do it include wrapping a hemp knife, raw material tape, dispensing thread glue or 502, but the result is that the thread cannot be tightened and it is useless. Now introduce a simple repair method. Useless small measuring tapes, easy pull buckles and the like at home, as long as they are retractable, there must be a coil spring inside. Remove the coil spring for use before throwing it away.

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Application of medical titanium alloy in the field of dental implants

When the hydrogen content in the titanium pipe is too much, the impact toughness and notched tensile strength will drop sharply due to the brittleness, so it is generally stipulated that the hydrogen content in the titanium pipe should not exceed 0.015%. In order to reduce the amount of hydrogen absorption, fingerprints, rolling mill marks, grease and other residues should be removed before heat treatment. There is no moisture in the heat treatment furnace. If the hydrogen content of the titanium pipe exceeds the allowable value, it must be removed by vacuum annealing.

When the temperature does not exceed 540 degrees, the oxide film of the titanium pipe fittings will not be significantly thickened, and at higher heat treatment temperatures, the oxidation rate will rapidly increase, and at the same time, the internal diffusion layer of the oxide material will become a pollution layer. The high brittleness ratio of the oxygen contamination layer causes cracks and damage on the surface of the part. There are mechanical processing methods for the deoxygenated pollution layer or chemical methods such as pickling and chemical milling. During the heat treatment, the heating time should be as short as possible under the premise of ensuring heat treatment. It can also be carried out in a vacuum furnace or an inert gas heating furnace. . The pollution caused by the titanium pipe fittings being heated in the air furnace should be appropriately avoided or reduced.

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