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制备了一种具有明显各向异性的碳/碳复合活塞材料。借助金相显微镜、扫描电镜等手段,对其微观结构进行了表征,研究其抗拉强度、热膨胀系数和摩擦磨损性能。结果表明,作为活塞用碳/碳复合材料,采用化学气相渗透(CVI)增密获得粗糙层结构的沉积碳,以提高其导热性能而不能使用沉积碳的光滑结构。室温下X、Z方向抗拉强度表现优异,约为400 MPa,在X、Z两个方向的热膨胀系数都小于0.5×10~(-6)K~(-1),Y向的热膨胀系数近似于零。长纤维绕编碳/碳材料比高镍铸铁具有更好的耐磨性。
A carbon / carbon composite piston material with obvious anisotropy was prepared. The microstructure was characterized by means of metallographic microscope and scanning electron microscope, and its tensile strength, thermal expansion coefficient and friction and wear properties were studied. The results show that as a carbon / carbon composite for piston, carbon deposited by rough layer structure can be obtained by chemical vapor infiltration (CVI), so as to improve its thermal conductivity and can not use the smooth structure of carbon deposition. At room temperature, the tensile strength in X and Z directions is excellent, about 400 MPa. The coefficients of thermal expansion in both X and Z directions are all less than 0.5 × 10 -6 K -1, and the coefficients of thermal expansion in Y direction are approximate At zero. Long fiber wound carbon / carbon materials have better wear resistance than high nickel cast iron.