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1、Density is small, light quality. Mainly depends on the density of carbon fiber carbonization temperature, PAN based carbon fiber after 1000 E processing is 117 g/cm3 density, the temperature is above 2300 E processing, generally is 210 ~ 210 g/cm3 density, type and E glass fiber density of 2155 g/cm3, metal steel fiber density of 7180 g/cm3. 2、High modulus (200 ~ 700 gpa), good rigidity, fatigue resistance, self-lubrication, small friction coefficient, wear-resisting performance is good. High modulus carbon fiber is also called the graphite fiber (GRF), generally between 92% ~ 96%, the carbon content PAN fiber M70J cornerstone ink for the theoretical value of modulus of 1020 gpa) (6717%, made in mitsubishi company recently K13C20 modulus # # 39 Beijing…
Carbon carbon composite material will occur oxidation in the circumstance of temperature above 450 C°,the rate of oxidation will increase rapidly with the temperature raising.some researches show that the strength of the carbon carbon composite material will reduce 10% with the oxidation loss 1%.the oxidation can not only cause the material loss,but also have the security risks on the material itself. So it’s important to do some protection of the C/C composite material. The method of antioxidant treatment mainly divided into two categories.one is matrix modification to be antioxidant, and another one is surface coating to be antioxidant.the matrix modification way is to treat the CFC material during the preparation process,by using the CVI, impregnation or chemical reaction synthesis etc…
Graphite color steel from iron ash to ash, black streaks, has significant heterogeneity, optical inhomogeneity, hardness and opaque, with metallic luster, aphanitic qualitative is bleak. 1 ~ 2 hardness, specific gravity 2.09 ~ 2.23, inferior graphite proportion is 1.84 ~ 1.98. (the proportion of change is decided by the amount of bubbles and). Chip can bend, soapy, paper and fingers to pollution. Graphite heat resistant (higher than copper and aluminum), with high electrical conductivity, which can withstand temperatures up to 3000 ℃, melting point 3800 ℃, boiling point 4250 ℃, plastic, chemical stability strong, insoluble in acid and alkali. Use and applications (1) the manufacture electric smelting furnace, electrolytic cell, the arc lamp and arc welding electrodes and generator, motor…
