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1、Determination of temperature in the process of graphitization The temperature of carbon carbon composite material graphitization is one of the most important index during the processing. For a long time,it is basically determined by experience. In the old days,people think the temperature is the higher the better,but it’s wrong. To any carbon composite material,there is always a ideal temperature,to the resin carbon,the best temperature is 2480℃,as for the CVD carbon,pitch carbon and mixed matrix carbon,the ideal temperature is influence by the relative content,mix form and the different type and property of the carbon fiber,and the application is also need to be considered. Usually, the resin carbon can be partly graphitized at about 2500℃,as for the pitch carbon,it’s easily to be…
With the development of solar energy Photovoltaic industry, the traditional graphite material is difficult to meet the needs of large-scale production equipment. However the carbon carbon composite material has a good thermo physical properties,it has a great advantage over the graphite material. The carbon carbon composite insulation parts,structure parts and heating unit will be more and more important to silicon single crystal furnace and poly-silicon ingot furnace. There are also some problems to the carbon carbon composite material,now,the best way is to use the SiC coating to increase the effective and service life. The carbon carbon composite material is to do some reinforce treatment on the basis of carbon fiber,it forms under the 2000~2500℃,it can withstand the high temperature of…
Recently, the author is commissioned by the company to develop a kind of can meet the high performance of high-speed brakes brake piece, raw material is used in continuous filament untwisted PAN based carbon fiber T300 and its tensile strength is more than 3400 mpa, tensile modulus of 230 gpa, elongation is 115%, the density of 1175 g/cm3, carbon content over 94%, fiber diameter between 6 ~ 8 lm, count is 6 k. The needled felt manufacturing process and requirements are as follows: 1.1 short carbon fiber net tire manufacturing will long carbon fiber bundle of short cut in 68 ~ 70 mm long short carbon fiber bundle, and then folded into a net shop on network, made into uniform…
