(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要:
关键字: 碳纳米管；炭/炭复合材料；热导率；热解炭
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Carbon nanotubes(CNTs)-grown carbon/carbon (C/C) composites which have CNTs in situ grown on carbon fibers of needled carbon fiber felts, and pure carbon/carbon composites were fabricated by the chemical vapor infiltration (CVI) method to investigate the effect of CNTs on room temperature Z direction thermal conductivity of C/C composites. Thermal conductivity of samples were tested by laser flash method. The results show that the room temperature Z direction thermal conductivity of CNTs-grown C/C composites is about 11.10 W/(m•K) which is generally 2 times that of pure C/C composites with nearly the same density. The reason is that the favorable effect of CNTs on room temperature Z direction thermal conductivity of C/C composites is achieved by better interfacial properties and formation of high-textured pyrocarbon that has better graphitizability and higher thermal conductivity than other types of pyrocarbon.
Key words: C/C composites; thermal conductivity; pyrocarbon
