Chinanews, May 29, Guangzhou Daily quoted the Xinhua News Agency as saying that Lu Xi, Director of Industrial Coordination Division of the Industrial Policy Department of the National Development and Reform Commission recently said in Guilin, Guangxi that China will accelerate the development of the auto parts industry and build a strong zero Component support system.
Lu Xi also said that it will guide leading enterprises in spare parts to achieve large-scale production and enter the international auto parts procurement system, actively participate in international competition, and increase the share of the international market.
At the recent national industrial restructuring work conference, the relevant person in charge of the Department of Industrial Policy of the National Development and Reform Commission stated that China's auto parts and vehicles have not developed in tandem, affecting the improvement of the overall vehicle technology level. Through joint ventures and cooperation, the manufacturing technology and quality of finished vehicle products have approached the international level, but the production of components lags behind the development of the vehicle. The overall supporting capacity of parts and components companies is not strong, the level of specialization is low, and the ability of independent development system integration is weak, which can not keep pace with the development of the whole vehicle.
Zirconium Diboride (ZrB2) is a highly covalent refractory ceramic material with a hexagonal crystal structure. Zirconium Diboride Tech Grade is an ultra high temperature ceramic (UHTC) with a melting point of 3246 °C. This along with its relatively low density of ~6.09 g/cm3 (measured density may be higher due to hafnium impurities) and good high temperature strength makes it a candidate for high temperature aerospace applications such as hypersonic flight or rocket propulsion systems. It is an unusual ceramic, having relatively high thermal and electrical conductivities, properties it shares with isostructural titanium diboride and hafnium diboride.
Zirconium Diboride Powder parts are usually hot pressed (pressure applied to the heated powder) and then machined to shape. Sintering of ZrB2 is hindered by the material's covalent nature and presence of surface oxides which increase grain coarsening before densification during sintering. Pressureless Sodium Hexametaphosphate sintering of Zirconium Boride Raw Material is possible with sintering additives such as Boron Carbide and carbon which react Titanium Dioxide with the surface oxides to increase the driving force for sintering but mechanical properties are degraded compared to hot pressed ZrB2.
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