C/C坯体结构对RMI制备C/SiC复合材料的影响  

Effect of C/C preforms on performances of C/SiC composites fabricated by RMI

作　　者：庞菲[1] 李辉 吴小军[1] 王毅[1] 孟国彪 PANG Fei;LI Hui;WU Xiao-jun;WANG Yi;MENG Guo-biao(Xi＇an Aerospace Composites Research Institute,Xi＇an 710025,China;The PLA Rocket Force＇s Military Representative Office in the Fourth Academy,Xi＇an 710025,China)

机构地区：[1]西安航天复合材料研究所,西安710025 [2]火箭军驻第四研究院军事代表室,西安710025

出　　处：《炭素》2018年第3期5-9,共5页Carbon

摘　　要：采用无涂层、SiC涂层、C和SiC复合涂层处理的炭布/网胎预制体,经过CVD和树脂浸渍/炭化混合致密,制备了4种C/C坯体,随后熔融渗硅获得C/SiC复合材料;研究了不同纤维涂层、基体炭类型对C/SiC复合材料弯曲强度和断裂方式的影响,并对复合涂层状态的C/SiC材料的摩擦磨损性能进行测试。结果表明:混合基体炭与纯热解炭的C/C坯体相比,制备的RMI-C/SiC材料弯曲强度更高,且经过涂层处理的C/SiC材料弯曲强度最高;复合涂层、混合基体炭均使材料表现出良好的"假塑性"。复合涂层处理的试样在制动压力0.6～0.8 MPa、惯量0.3～0.4 kg·m^2、转速为6000～7500 r/min的条件下,平均摩擦系数为0.348～0.454,且材料磨损量较小,最大为2.188μm/(面·次)。Through molten silicoil infiltration the C/SiC composites were made of the different porous C/C preforms which were prepared by chemical vapor infiltration, resin impregnation carbonization, pyre-carbon and SiC coatings with the carbon cloth/feh as preforms. The effects of different coatings and carbon-matrix on the flexural strength and fracture modes of C/SiC composites were studied. And the friction and wear properties of the C/SiC composites with multi-coatings were tested. The results show that C/SiC composites with mix-matrix have higher flexural strength than pyre-carbon matrix, and the C/SiC composites with coatings reach the highest flexural strength. The flexural load-displacement curves of C/SiC composites with muhi-coatings and mix-matrix show better ＂pseudo-plastic＂. The average coefficient of friction of C/SiC composites with multi-coatings is 0.348-0.454 at 0.6-0.8 MPa, 0.3-0.4 kg·m^2 and 6000-7500 r/min, and the linear wear rate is 2.188 μm/（cycle· face）.

关 键 词：C/SIC复合材料 C/C坯体 弯曲性能 摩擦磨损 

分 类 号：TB332[一般工业技术—材料科学与工程]