不同T300级碳纤维轴棒法C/C复合材料的导热性能  

Thermal Conductance of Axial Carbon Rods C/C Composites Woven With Different T300 Carbon Fiber

作　　者：冯阳阳[1] 崔红[1] 李瑞珍[1] 吴书峰[1] 

机构地区：[1]西安航天复合材料研究所,西安710025

出　　处：《宇航材料工艺》2011年第2期113-116,共4页Aerospace Materials & Technology

摘　　要：选取两种国产T300级PAN基碳纤维,轴棒法制备4D预制体,以高温煤沥青为前驱体,采用液相浸渍-炭化以及石墨化相结合的技术制备C/C复合材料(密度≥1.95 g/cm3),研究了C/C复合材料从室温(RT)到800℃的热导率及其影响因素。研究表明,在实验温度范围内C/C复合材料的热导率随温度升高而降低,由于原材料自身特性和预制体编织结构具有方向性,使C/C复合材料的导热性能表现出各向异性,径向热导率明显高于轴向;密度高、开孔率小、石墨化程度高的C/C复合材料由于晶粒间连通状态好,微晶结构趋于完整,材料的热导率增大;以低压热处理为最终处理工艺的C/C复合材料热导率略有提高;采用国产T300级与东丽T300碳纤维制备的C/C复合材料的热导率相当。By taking axial carbon rods 4D preform woven with two kinds of T300 grade PAN based carbon fiber made in China as reinforcement and high temperature coal-tar pitch as matrix precursor,the C/C composites with a density up to 1.95 g/cm3 were prepared by using combined impregnation-carbonization and graphitization techniques.Thermal conductivity of the C/C composites from RT to 800℃ and the influencing factors were discussed.The results show that thermal conductance of the C/C composites is decreased with increasing of the temperature under the experimental condition.Because of the own features of raw materials and the directivity of preform,the thermal conductivity of the C/C composites along radial direction is higher than that of axial direction.C/C composites with higher density,lower porosity and higher graphitization degree have higher thermal conductivity due to their excellent connectivity between crystal particles and gradually perfected crystal microstructure.The thermal conductivity of the C/C composites with low pressure heat treatment as its final process is higher than that after high pressure carbonization.The thermal conductivity of C/C composites prepared by T300 carbon fibers made in China is similar to that of the C/C composites prepared by Toray T300 carbon fibers.

关 键 词：碳纤维 C/C复合材料 轴棒法 热导率 

分 类 号：TQ342.742[化学工程—化纤工业]