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High purity graphite is a graphite with a carbon content of more than 99.99%. High purity graphite with high temperature resistance, corrosion resistance, thermal shock resistance, thermal expansion coefficient is small, self lubrication, resistance coefficient is small and easy to processing machinery, and other advantages, is widely used in metallurgical, mechanical, environmental, chemical, electronic, medical, military and aerospace fields, the position in the national economy is becoming more and more important, especially in the solar photovoltaic industry. The global photovoltaic industry average annual growth rate of 40%, China as the world's largest producer of solar photovoltaic, 70% of its share to the global, high-grade graphite materials consumed by the industry in 2011 reached 2.3 million T to expected future photovoltaic…
One way to decrease the ablation property of the carbon carbon composite material is add the coating which can be antioxidant and anti-scouring during the high temperature. Now the recognized method in the international community is HfC,TaC,ZrC and SiC etc. The technology mainly include CVI/CVD,CVR, liquid phase impregnation and coating. The C/C composite material throat made in Russia,using the Hf and Ta to dip into it,which can bear the 3800 centigrade and meet 8.0Mpa pressure,the ablation property is much lower than the normal carbon carbon composite throat. The SiC coating C/C composite material can be made from two different kinds of the composite material matrix,one is needle felt reinforced material,using the CVD to densify to 1.3g/cm3 then using resin impregnant…
The carbon carbon composite material mainly consists of carbon fiber and carbon matrix two parts. The rational design can control the strength,thermal and physical properties of the carbon carbon composite material etc. and make it meet the production requirement on the direction and dimension. The function of the carbon matrix is fix the structure and direction of the carbon perform, and make it into continuous phase,and when it is under load,the carbon matrix can transfer the load to the carbon fiber. In addition,the carbon matrix can increase the density of the carbon carbon composite material,and reduce the porosity, it can protect the perform under the ablation and oxidation environment. The carbon matrix not only can change the properties of the…
