活塞用长纤维绕编碳/碳复合材料的微观结构和性能  

Microstructure and Properties of Long-fiber Coiled C/C Composites for High Performance Pistons

作　　者：朱亿鹏 潘青林[1] 汤中华 易绿林 杨志勇 

机构地区：[1]中南大学材料科学与工程学院 [2]湖南江滨机器(集团)有限责任公司

出　　处：《特种铸造及有色合金》2017年第10期1121-1125,共5页Special Casting & Nonferrous Alloys

摘　　要：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 C/C composites for piston with obvious anisotropy was prepared.The microstructure of the composites was characterized by metallographic microscope and scanning electron microscope.The tensile strength,thermal expansion coefficient and friction-wear properties of the composites were investigated.The results show that as the piston C/C composites,chemical vaporization infiltration（CVI）is used to prepare the deposited carbon with rough laminar structure to improve its thermal conductivity and avoid the smooth structure of sedimentary carbon.At room temperature,the tensile strength of the composites at the X and Z directions exhibits desirable,about 400 MPa.The thermal expansion coefficient at the X and Z directions is less than 0.5×10^（-6） K^（-1）,while the thermal expansion coefficient at Y direction is closed to zero.Long fiber coiled C/C material has the higher wear resistance than high nickel cast iron.

关 键 词：碳/碳复合材料 力学性能 活塞 

分 类 号：TB332[一般工业技术—材料科学与工程]