Titanium alloy technology and application
Preparation of titanium alloy
The traditional processing of titanium alloy generally adopts smelting and casting technology, and the latest processing technology is divided into the following types:
1) Near net shape technology;
2) Line friction welding technology;
3) Superplastic forming technology;
4) Computer simulation technology of material preparation and processing.
Near net forming technology includes laser forming, precision casting, precision forging, powder metallurgy, spray forming and other methods. Powder metallurgy is a new technology that uses titanium powder or titanium alloy powder as raw material, through forming and sintering, to manufacture titanium parts. The first is to produce powder. Generally, mechanical alloying method is used. Ball mill is used to impact, grind and stir the raw materials. Then, the alloy which has already formed powder is pressed and formed, there are two pressing methods, pressure forming and non pressure forming. The purpose of this step is to make a certain shape and size of the die, and make it have a certain density and strength. Then, the high-performance titanium material was prepared by spark plasma sintering of the preform, applying the specific sintering power and pressing pressure to the sintered powder by using the upper and lower die stamping and the electrified electrode, and through the discharge activation, thermoplastic deformation and cooling. Then, the titanium alloy after plasma sintering is treated, generally heat treatment or plastic processing.
Application of titanium alloy
Titanium alloy was widely used in the field of aerospace in the early days, mainly used to make aircraft engines or air pressure components. Later, with the continuous development of technology, titanium alloy has entered the lives of ordinary people, and there are also titanium alloy figures in factories or household devices. At present, countries and institutions are competing to develop new titanium alloy, which has the characteristics of low cost and high performance. In recent years, the new development of titanium alloy mainly focuses on the following five aspects.
1. Medical titanium alloy
Titanium alloy is an ideal medical material with small density and good biocompatibility. It can even be implanted into human body. Titanium alloy used in medical field before contains vanadium and aluminum, which will cause harm to human body. However, in recent years, Japanese scholars have developed a new type of titanium alloy, which has good biocompatibility. However, at present, this kind of alloy has not been mass produced. It is believed that in the near future, this kind of high-quality alloy can be widely used in daily life.
2. Flame retardant titanium alloy
The titanium base alloy which can resist combustion under certain pressure, temperature and air flow rate is resistant titanium alloy. The United States, Russia and China have developed new anti ran titanium alloys one after another, among which the United States applies these anti ran titanium alloys to the engine. Because these titanium alloys are not sensitive to combustion, they can greatly improve the stability of the engine.
3. High strength and high toughness β type
β - titanium alloy has the characteristics of high strength, good weldability and excellent cold and hot working performance. By using this rule, the characteristics of β - titanium alloy are very obvious: good flexibility, good plasticity, good weldability. After solution aging treatment, its mechanical properties are improved greatly. At present, this kind of titanium alloy has been prepared in Japan and Russia.
4. Titanium aluminum compound
Compared with general titanium alloy, titanium aluminum compound has better high temperature performance, oxidation resistance and creep resistance, and its density is smaller than that of general titanium alloy. These excellent characteristics are bound to lead to a new upsurge of titanium aluminum alloy. At present, this new titanium aluminum alloy has been synthesized in the United States and is in mass production.
5. High temperature titanium alloy
The titanium alloy prepared by the combination of rapid solidification and powder metallurgy has excellent high temperature mechanical properties. The temperature limit of high temperature titanium alloy is much higher than that of ordinary titanium alloy. At present, a new type of high temperature titanium alloy has been prepared in the United States.
6. Titanium nickel alloy
An alloy composed of titanium and nickel is called a "memory alloy". This alloy is made into a predetermined shape. After being shaped, if it is deformed by external forces, it can be restored to its original appearance only by slightly heating. The alloy can be used in various fields such as instruments, electronic devices, etc.
Titanium has many incomparable advantages. With the progress of society and the development of science and technology, the application of titanium and titanium alloy will be more extensive. The demand for titanium and titanium alloy will increase day by day, and the high production cost is one of the main reasons limiting the popularization and use of titanium and titanium alloy. Therefore, the development and application of low-cost, large-scale and eco-friendly continuous production process can make titanium and titanium alloy more widely used.