不同制动速度下C/C-SiC-Fe材料的摩擦磨损行为及机理  

Tribological behaviour and mechanism of C/C-SiC-Fe composites at different braking speeds

作　　者：肖鹏[1] 李专[1] 熊翔[1] 付美荣[1] 

机构地区：[1]中南大学粉末冶金国家重点实验,长沙410083

出　　处：《中国有色金属学报》2009年第6期1044-1048,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家高技术研究发展计划资助项目(2006AA03Z560);湖南省杰出青年科学基金资助项目(06JJ1007)

摘　　要：以针刺炭纤维整体毡为预制体,采用化学气相沉积法制备C/C多孔体,然后熔融浸渗Si和Fe制得C/C-SiC-Fe材料,研究制动速度对C/C-SiC-Fe材料摩擦磨损性能的影响。采用SEM观察了C/C-SiC-Fe的磨损表面及磨屑形貌,结果表明:C/C-SiC-Fe材料的高速制动平稳,随制动速度的提高其摩擦因数先升高后降低,制动速度为12m/s时,摩擦因数达到最大值0.59;随着制动速度的提高,磨损率先增加后降低;当制动速度为24m/s时,磨损率又急剧上升至3.3×10-8cm3/(N·m);摩擦磨损机制在低速制动条件下主要表现为磨粒磨损;中速时以粘着磨损为主;高速时以疲劳磨损和氧化磨损为主。C/C performs were prepared by densification of needled carbon fiber felts with CVD. The C/C-SiC-Fe braking composites were manufactured by infiltration of moltening Si and Fe into the obtained C/C performs. The tribological characteristics of C/C-SiC-Fe composites at different braking speeds were investigated. The worn surfaces of C/C-SiC-Fe and the wear debris were examined by SEM. The results show the brake of C/C-SiC-Fe composites at high speed is stable The coefficient of friction rises to the maximum of 0.53 at braking speed of 12 m/s firstly and then falls with increasing braking speed. The wear rates have similar change at the beginning but increase rapidly to the maximum of 3.3 × 10^-8m^3/（N·m） at braking speed of 24 m/s. The wear mechanism changes from abrasion, adhesion to fatigue and oxidation with increasing braking speed.

关 键 词：C/C-SiC-Fe材料 熔融浸渗 制动速度 磨损性能 

分 类 号：TB331[一般工业技术—材料科学与工程] TH117.3[机械工程—机械设计及理论]