准单向纤维排布环形炭/炭复合材料的组织与性能  

Microstructure and properties of annular carbon/carbon composite for quasi-unidirectional fiber configuration

作　　者：郑吉祥[1] 张福勤[1] 黄华[2] 王淦平[2] 夏莉红[1] ZHENG Jixiang ZHANG Fuqin HUANG Hua WANG Ganping XIA Lihong(State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China Laboratory of Science and Technology on High Power Microwave, China Academy of Engineering Physics, Mianyang 621900, China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]中国工程物理研究院高功率微波技术重点实验室,绵阳621900

出　　处：《粉末冶金材料科学与工程》2017年第3期329-334,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划资助项目(2011CB605803)

摘　　要：以PAN基炭纤维无纬布为主体,与短切网胎纤维交互叠层制备准单向纤维排布环形炭预制体,然后采用等温化学气相渗透工艺,在丙烯与氮气分压比为1.2:1,系统压力为1.5 kPa的条件下进行增密,制备准单向纤维排布环形C/C复合材料,研究气相渗透温度对增密效率的影响,并对复合材料进行组织观察与导电导热性能测试。结果表明:在980℃温度下化学气相渗透效率最高,480 h后获得密度为1.84 g/cm^3、孔隙率为6.4%的准单向纤维排布C/C复合材料;准单向纤维排布环形C/C复合材料沿轴向方向具有高纤维取向,并且材料沿轴向具有较高的导电与导热性能,其电阻率为20.3μ?·m,热导率为72.8 W/(m·K)。热解炭组织为高织构粗糙层,热解炭生长良好,石墨化度为60.1%。Annular carbon/carbon composite for quasi-unidirectional fiber configuration was prepared by isothermal chemical vapor infiltration process with PAN base carbon fiber fabric as matrix and unidirectional fiber felt as annular quasi-unidirectional fiber configuration preform. The partial pressures ratio of propylene and nitrogen is 1.2：1, and the system pressure is 1.5 kPa for densification process. The effect of infiltration temperature on density was studied. Meanwhile, microstructures and properties of carbon/carbon composite for quasi-unidirectional fiber configuration were also investigated. The results show that the densification efficiency achieves the highest at 980℃. At 980℃, the carbon/carbon composite for quasi-unidirectional fiber configuration, whose density is 1.84 g/cm3 and porosity is 6.4%, can be prepared after chemical vapor infiltration for 480 h; The annular carbon/carbon composite for quasi-unidirectional fiber configuration, has not only high fiber orientation but also high resistively （20.3μΩ·m） and thermal conductivity （72.8 W/（m·k）） along the axial direction. Besides, its microstructures mainly consist of the rough laminar pyrocarbon with high structural integrity and graphitization degree （60.1%）.

关 键 词：C/C复合材料 化学气相渗透 准单向纤维排布 阴极 强流电子束 

分 类 号：TB332[一般工业技术—材料科学与工程]