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The main method to increase carbon carbon composite material oxidation resistance are surface coating technology and carbon matrix modification. The traditional methods mainly include carbon fiber modification, liquid phase impregnation, additive agent, matrix replacement etc. Carbon carbon composite material has low density, high strength,high modulus,high thermal conductivity,low coefficient of expansion and thermal shock resistance etc. These properties can maintain under the 2000 centigrade,can make the carbon carbon composite material to be the preferred material of high thermal structure material, and it’s widely used in the aerospace field. However,most of the properties can only maintain under the inert environment. Carbon carbon composite material will occure oxidation when the tempterature reach 400 centigrade,the oxidation can reduce the strength of the material,and will…
By changing the machining method of the carbon carbon composite material,the C/C nozzle can meet CNC machining,it can avoid the various defects made by manual processing,improve the qualified rate, increase the workshop processing ability. Nowadays,carbon carbon composite material is the main development trend of tactical missile throat material,the high-property carbon carbon composite nozzle is mostly made of 4D C/C material. The carbon carbon composite nozzle in the SRM has a high property requirement,mainly include ablation resistance property,high stability,machinable and can be mass production,now it need low cost. The normal turning machine is low machining accuracy and influenced personaly too much,the machining surface is not uniform,to confirm the quality of the carbon carbon composite nozzle,it should be processed more accuract. The…
The natural graphite is one of the most important mineral raw materials in the traditional and the emerging industry in China and the development of natural graphite is getting huger and huger. Because of the special nature of graphite, America and European countries take that as a strategic resources. The export of graphite is restricted strictly. However in China, there are many problems of graphite mining and producing such as the waste of resources, pollution, disorder and capacity surplus. Therefore in the future, Chinese government will take some action to manage the graphite market. Graphite is the top quality of mine in China and the species of graphite export is the natural and primary graphite in a low price. However,…
