原位生长碳纳米管对炭/炭复合材料导热性能的影响  

Effect of in situ grown carbon nanotube on thermal conductivity of carbon/carbon composites

作　　者：周建伟[1] 廖寄乔[1] 王占锋[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2008年第3期383-387,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展计划资助项目(2006CB600904)

摘　　要：以炭纤维表面原位生长有碳纳米管(Carbonna notubes,CNTs)的针刺毡体作为前驱体制备出生长有CNTs的炭/炭复合材料,并与在同样工艺条件下通过致密化最终热处理得到的纯炭/炭复合材料进行对比。结果表明,在密度几乎相同的情况下,生长有CNTs的炭/炭复合材料的室温Z轴热导率约为11.10W/(m·K),几乎为纯炭/炭复合材料的室温Z轴热导率(6.28W/(m·K))的2倍,其原因可能在于:CNTs可以有效改善炭纤维和热解炭之间的界面特性,明显减少炭/炭复合材料中纤维和热解炭界面处周裂纹的出现,还可以诱导热解炭形成一种拥有更高导热率更易石墨化的粗糙结构。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 ofpyrocarbon.

关 键 词：碳纳米管 炭/炭复合材料 热导率 热解炭 

分 类 号：TB332[一般工业技术—材料科学与工程]