C/C复合材料微观结构对其制动摩擦磨损性能的影响  

Effects of Microstructure on the Frictional Properties of C/C Composites

作　　者：雷宝灵[1] 易茂中[1] 徐惠娟[1] 冉丽萍[1] 葛毅成[1] 彭可[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：《摩擦学学报》2010年第4期373-378,共6页Tribology

基　　金：国家重点基础研究项目2006CB600906)的资助

摘　　要：采用透射电子显微镜(TEM)、扫描电子显微镜(SEM)等手段研究了基体炭分别为树脂炭和粗糙层热解炭结构的C/C复合材料的微观结构,并探讨了材料的微结构对其制动摩擦磨损性能的影响.结果表明:炭纤维附近的树脂炭被高度石墨化,导致树脂炭样件具有适当、稳定的摩擦系数;树脂炭片层之间存在明显的裂纹,远离炭纤维的树脂炭仍是各向同性结构,容易被剪切力剪断,产生大量碎屑,破坏了摩擦动态平衡,磨损量大是制约其作为优良制动摩擦材料的关键因素.Microstructure of C/C composites with resin-derived carbon and rough laminate pyrocarbon was studied by transmission electron microscopy（TEM）,scanning electron microscopy（SEM）.And effect of microstructure on frictional properties was discussed.TEM and SAED results showed that the resin-derived carbon near the carbon fibers was highly graphitized,which conferred appropriate and stable friction coefficient on composites.Because of the visible cracks between resin-derived carbon lamellae and the isotropical carbon beyond the carbon fiber,resin-derived carbon was readily destroyed by shearing.This gave a birth of a large number of chippings and disturbed the dynamic equilibrium.The high wear rate of the composites was the main problem for the application as a braking disc.

关 键 词：C/C复合材料 微观结构 摩擦磨损 

分 类 号：TB332[一般工业技术—材料科学与工程]