Titanium plate has the characteristics of low density, high specific strength and corrosion resistance, which has great application potential in the automotive industry. The use of titanium and titanium alloys on cars can achieve the effects of saving fuel, reducing engine noise and vibration, and improving longevity. However, for a long time, automotive materials have been nationwide of materials such as steel and Al. In order to enter the automotive market, Ti materials must further reduce the cost to a level acceptable to the automotive industry in addition to its functional advantages. Automotive Ti-Ti metallurgical parts are a very promising area, but currently limited by cost and other factors, the use and implementation of development are slow. The use of leading titanium plate metallurgy skills to produce Ti titanium plate metallurgy parts can not only greatly reduce the cost, but also help the implementation of Ti and its alloys in the automotive industry, making it a major application after the aerospace industry category. The development of low-cost titanium and its alloy titanium plates can provide low-cost materials for automotive titanium-titanium plate metallurgical parts. From the existing skills, the most suitable for the automotive industry are the sponge Ti powder method, hydrodehydrogenation method, and metal hydride recovery method.
First, sponge Ti powder method
This is currently a method that can satisfy the demand of the titanium plate in the automobile industry in terms of cost. The traditional production of sponge Ti and the residual materials in the process is mainly used to break it; the obtained titanium plate is often thicker and richer in content. Cl element. The Huachang Company of the United States chose to introduce TiCl4 and Mg vapor into an 850 ° C tubular furnace one after another by the gas phase method, and quickly produce fine Ti powder and MgCl2. However, it is difficult to separate such fine powder from MgCl2, and the O content is high. The spray reverberation method sprays gas onto liquid Mg to make it reverberate to form particles. Tests show that for every 100 grams of Mg and 400 grams of TiCl4, about 100 grams of Ti powder with a particle size of tens of microns can be prepared, and the output power has been increased by 2 times. The cost is reduced by 50%, which is expected to be used as the material of titanium products of titanium plate metallurgy.
2. Hydrodehydrogenation
This method is because the produced titanium plate has a wide granularity plan and low cost, and the demand for materials is not strict. The technology is relatively easy to complete. After years of improvement and implementation, it has become the primary method for producing Ti powder at home and abroad. However, the titanium plate prepared by this method tends to have high contents of O and N. Northwest China Nonferrous Metals Research Institute selected hydrodehydrogenation technology to hydrodehydrogenate cast ingots to produce high-quality titanium plates with low O, N, and Cl, which has outstanding functions. Currently, it can produce O content of less than 0.20%. Titanium plates have been mass-produced, and it is expected to supply stable titanium plates for automotive titanium plate metallurgy parts. Japan's Toho Titanium Corporation uses improved technology to prepare Ti powder with a particle size of fewer than 150 microns and an O content of less than 0.15%; based on this discussion, Toho Titanium Corporation invested 1 billion yen to create a 30-ton hydrodehydrogenation process Ti powder production line.
3. Metal hydride recovery method
TiCl4 can be restored with hydrogen at 3500 ° C, and TiO2 can be restored with carbothermal at 1800 ° C or higher. In order to reduce the reaction temperature, scientists from the former Soviet Union proposed to use CaH2 to restore TiO2 and TiCl4, which can be carried out at a temperature of 1100 to 1200 ° C. The reaction produces TiH2, and then Ti is obtained by de-H. Because this method does not have a Cl element participating in the response, a titanium plate with extremely low Cl content can be obtained. I heard that its cost is only one-third of the traditional hydrodehydrogenation method, and it now has the planned production level. Although the Ti powder produced by this method has a high H content, it is reported that the presence of a small amount of H is conducive to sintering and improving the micro arrangement of the titanium plate, and can be completely removed during the subsequent vacuum sintering and annealing processes.
titanium rod grade 12 titanium pipe grade 2 titanium sheet titanium forging
First, sponge Ti powder method
This is currently a method that can satisfy the demand of the titanium plate in the automobile industry in terms of cost. The traditional production of sponge Ti and the residual materials in the process is mainly used to break it; the obtained titanium plate is often thicker and richer in content. Cl element. The Huachang Company of the United States chose to introduce TiCl4 and Mg vapor into an 850 ° C tubular furnace one after another by the gas phase method, and quickly produce fine Ti powder and MgCl2. However, it is difficult to separate such fine powder from MgCl2, and the O content is high. The spray reverberation method sprays gas onto liquid Mg to make it reverberate to form particles. Tests show that for every 100 grams of Mg and 400 grams of TiCl4, about 100 grams of Ti powder with a particle size of tens of microns can be prepared, and the output power has been increased by 2 times. The cost is reduced by 50%, which is expected to be used as the material of titanium products of titanium plate metallurgy.
2. Hydrodehydrogenation
This method is because the produced titanium plate has a wide granularity plan and low cost, and the demand for materials is not strict. The technology is relatively easy to complete. After years of improvement and implementation, it has become the primary method for producing Ti powder at home and abroad. However, the titanium plate prepared by this method tends to have high contents of O and N. Northwest China Nonferrous Metals Research Institute selected hydrodehydrogenation technology to hydrodehydrogenate cast ingots to produce high-quality titanium plates with low O, N, and Cl, which has outstanding functions. Currently, it can produce O content of less than 0.20%. Titanium plates have been mass-produced, and it is expected to supply stable titanium plates for automotive titanium plate metallurgy parts. Japan's Toho Titanium Corporation uses improved technology to prepare Ti powder with a particle size of fewer than 150 microns and an O content of less than 0.15%; based on this discussion, Toho Titanium Corporation invested 1 billion yen to create a 30-ton hydrodehydrogenation process Ti powder production line.
3. Metal hydride recovery method
TiCl4 can be restored with hydrogen at 3500 ° C, and TiO2 can be restored with carbothermal at 1800 ° C or higher. In order to reduce the reaction temperature, scientists from the former Soviet Union proposed to use CaH2 to restore TiO2 and TiCl4, which can be carried out at a temperature of 1100 to 1200 ° C. The reaction produces TiH2, and then Ti is obtained by de-H. Because this method does not have a Cl element participating in the response, a titanium plate with extremely low Cl content can be obtained. I heard that its cost is only one-third of the traditional hydrodehydrogenation method, and it now has the planned production level. Although the Ti powder produced by this method has a high H content, it is reported that the presence of a small amount of H is conducive to sintering and improving the micro arrangement of the titanium plate, and can be completely removed during the subsequent vacuum sintering and annealing processes.
titanium rod grade 12 titanium pipe grade 2 titanium sheet titanium forging
No comments:
Post a Comment