热解炭微观结构对C/C复合材料摩擦磨损性能的影响  

Influence of microstructure of pyrocarbon on friction and wear properties of C/C composites

作　　者：廖寄乔[1] 黄伯云[1] 熊翔[1] 徐慧娟[1] 汤中华[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《粉末冶金材料科学与工程》2003年第2期114-121,共8页Materials Science and Engineering of Powder Metallurgy

摘　　要：研究了热解发光学特性分别为粗糙层结构和光滑层结构试样的摩擦磨损性能。粗糙层结构试样由于具有较高的导热系数,其传热和散热能力比光滑层结构试样的强。在300～800℃时,粗糙层结构试样的膨胀系数基本保持稳定,而光滑层结构试样的膨胀系数随温度升高递增,使刹车过程中前者摩擦因数稳定,后者摩擦性能差。利用场发射高分辨电子显微镜研究了粗糙层结构和光滑层结构试样的微观结构。结果表明;前者生长择优取向明显,生长表面光滑,在摩擦过程中形成片状的石墨结构磨屑,保持稳定的摩擦性能;后者则为低织构疏松层状结构,生长表面粗糙。在磨擦过程中形成颗粒状或大团状结构,导致摩擦性能不稳定。热解炭微观结构的差异是导致2种结构试样热性能、摩擦磨损性能差异的根本原因。The friction and wear properties of C/C composites which have rough laminar and smooth laminar pyrocarbon respectively were investigated. The results show that the rough laminar sample has stronger thermal property than smooth laminar sample. Between 300～800℃, the CET of rough laminar sample is stable, which leds to the stable friction coefficient; and the CET of smooth laminar sample is increasing which leds to unstable friction property. The microstructues of rough laminar and smooth laminar pyrocarbons were studied through high resolution SEM. The results show that the difference of microstructure of two kinds of pyrocarbon is great, which led to obviously different friction and wear properties. The friction and wear properties of C/C composites which have rough laminar pyrocarbon are better than of C/C composites which have smooth laminar pyrocarbon.

关 键 词：热解炭 微观结构 摩擦磨损 C/C复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]