Titanium plate has the characteristics of low density, high specific strength and corrosion resistance, so it has great application potential in automobile industry. The application of titanium and titanium alloy in cars can achieve the effect of saving fuel, reducing engine noise and oscillation, and improving longevity. However, for a long time, automobile data has been steel, Al and other data throughout the country, Ti material to enter the automobile market, in addition to its own functional advantages, must further reduce the cost to the automobile industry can accept the level. Automobile Ti titanium plate metallurgy parts is a very promising category, but the current constraints such as capital factors, the application and implementation of development is slow. Selecting the leading titanium plate metallurgy skills to prepare Ti titanium plate metallurgy parts can not only greatly reduce the cost, but also help Ti and its alloy to promote in the automobile industry, making it become another big application category after the aerospace industry. The development of low cost titanium and its alloy titanium plate can provide low cost materials for automotive titanium plate metallurgical parts. According to the existing skills, the primary methods suitable for the automobile industry are sponge Ti powder method, hydrogenation dehydrogenation method and metal hydride restoration method.
1. Sponge Ti powder method. This is a way to satisfy the demand for titanium plates in the current automobile industry in terms of capital, the primary use of traditional production of sponge Ti and the residual materials in the process, will be broken; The titanium plates obtained are often thicker and contain higher Cl content. The American Huachang Company adopts the gas phase method to introduce TiCl4 and Mg vapor into the tubular furnace at 850℃ successively, and then generates the fine Ti powder and MgCl2 rapidly. However, it is difficult for such fine powder to separate from MgCl2, and the Content of O is high. Japan to create a spray reaction method, the gas sprayed on liquid Mg, so that its reaction particles, the test indicated that every 100 grams of Mg and 400 grams of TiCl4 can be prepared with a particle size of tens of micrometers of Ti powder about 100 grams, production power improved 2 times, cost decreased 50%, is expected to be used as titanium plate metallurgy Ti products material.
2. Hydrogen dehydrogenation. This method has become the primary method to produce Ti powder at home and abroad through years of improvement and implementation, because of the wide granularity planning and low cost of the produced titanium plate, the demand for materials is not strict, and the technology is relatively easy to complete. However, titanium plates prepared by this method often contain high O, N and so on. Northwest China Institute of Nonferrous Metal Research chooses hydrogenation dehydrogenation technology to cast ingots, prepared low O, N, Cl high-quality titanium plate, with outstanding functions, has been able to produce O content less than 0.20% of the titanium plate, and has completed the mass production, is expected to provide safe titanium titanium plate for automotive titanium plate metallurgical parts. Ti powder with particle size less than 150 microns and O content less than 0.15% was prepared by Tobang Titanium Company in Japan with improved technology. On the basis of this research, Dongbang Titanium Company invested 1 billion yen to create an annual production line of 30 tons of Ti powder by hydrogenation.
3. Metal hydride restoration. TiCl4 can be restored with hydrogen at 3500℃, while TiO2 can be restored with carbon heat above 1800℃. In order to reduce the reaction temperature, the former Soviet Union scientists proposed to use CaH2 to recombine TiO2 and TiCl4, which can be carried out at 1100 ~ 1200℃. The reaction generates TiH2, and then the Ti powder can be obtained by deh. Because no Cl element participates in the reaction in this method, titanium plates with extremely low Cl content can be obtained. It is said that its cost is only one third of that of the traditional hydrogenation dehydrogenation method, and now it has the level of planning production. Although Ti powder produced by this method has a high content of H, it has been reported that the presence of a small amount of H is conducive to the sintering and improvement of the microscopic arrangement of the titanium plate, and can be completely removed in the subsequent vacuum sintering and annealing process.