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高织构热解炭基炭/炭复合材料的制备与力学性能

ISSN号：1003-6326
期刊名称：《中国有色金属学报：英文版》
时间：0
分类：TG1[金属学及工艺—金属学]
作者机构：西北工业大学凝固技术国家重点实验室,C/C复合材料工程技术研究中心,西安710072
相关基金：Projects（51221001,50972121）supported by the National Natural Science Foundation of China; Project（B08040）supported by the Introducing Talents of Discipline to Universities,China; Project（11-BZ-2012）supported by the Research Fund of the State Key Laboratory of Solidification Processing（NWPU）,China

关键词： C, C复合材料, 高织构, 化学气相沉积, 石墨化度, 力学性能, carbon/carbon composites, high texture, chemical vapor infiltration, graphitization degree, mechanical properties

中文摘要：

以天然气为炭源气体,采用等温化学气相沉积工艺对孔隙率为89.5%的短切炭纤维毡进行致密化。经过150h的沉积,所制备的炭/炭（C/C）复合材料的密度达到1.89g/cm3。利用PLM、XRD、SEM以及三点弯曲测试对所制备的C/C复合材料的纤维结构和力学性能进行研究。结果表明：沉积的热解炭基体为高织构热解炭;经过高温石墨化处理后,大幅度地提高了材料的晶粒尺寸与石墨化度,降低了材料的强度和模量,并提高了其韧性。这些力学性能的变化与石墨化处理后材料内部显微结构的变化相关。

英文摘要：

Short carbon fiber felts with an initial porosity of 89.5% were deposited by isobaric, isothermal chemical vapor infiltration using natural gas as carbon source. The bulk density of the deposited carbon/carbon （C/C） composites was 1.89 g/cm3 after depositing for 150 h. The microstructure and mechanical properties of the C/C composites were studied by polarized light microscopy, X-ray diffraction, scanning electron microscopy and three-point bending test. The results reveal that high textured pyrolytic carbon is deposited as the matrix of the composites, whose crystalline thickness and graphitization degree highly increase after heat treatment. A distinct decrease of the flexural strength and modulus accompanied by the increase of the toughness of the C/C composites is found to be correlated with the structural changes in the composites during the heat treatment process.