炭/炭复合材料的摩擦磨损性能

来源期刊：中南大学学报(自然科学版)2002年第2期

论文作者：李江鸿 熊翔 徐惠娟 王林山 张福勤 巩前明

文章页码：173 - 176

关键词：炭/炭复合材料;刹车;摩擦磨损;石墨化度

Key words：carbon-carbon composites; brake; friction and wear; graphitization

摘    要：选取由CVD预增密至一定密度,再进行树脂浸渍/炭化补充增密至1.85 g/cm³的炭/炭复合材料作摩擦环试样.测试了该试样在一系列刹车速度时的摩擦磨损性能,并对其摩擦面及磨屑进行了SEM观察,对摩擦面进行显微喇曼光谱分析.研究结果表明:炭/炭复合材料的摩擦磨损性能随刹车速度的变化而发生显著变化,在10 m/s时出现最高峰,在25 m/s出现亚高峰;磨损量随刹车速度的增加而增加,而氧化磨损在刹车速度为25 m/s时开始大量产生,在28 m/s时达最大值.其摩擦表面形貌、结构及磨屑亦有较大差别.刹车速度从5 m/s升至20 m/s时,摩擦面石墨化度降低,石墨结构向无定型碳结构转变,但在高速时石墨化度反而升高,无定型碳结构又向石墨结构转变.

Abstract: A series of brake experiments at different brake velocities have been made for carbon-carbon composite which was densificated by resin impregnation after pre-densificating to initial density by CVD(chemical vapor deposition).SEM graphs of the friction surface and the wear debris and the analysis of micro-Ramam spectra of the friction surface are given. The results show that, the friction coefficient braking at the speed of 10 m/s is the highest and that at 25 m/s is the second highest and the wear rate increases with the brakingvelocity. The friction and wear properties are connected closely with the surface morphology and the structure of the friction surface and the wear debris. The graphitization degree of the friction surface is increased at a high braking velocity.