摘要
采用差压铸造法制备了SiC_(P)/A356复合材料高速列车制动盘。在制动盘适当位置取样并详细研究了其组织结构。采用销盘式摩擦磨损试验方法,在200℃环境温度下系统研究了其滑动摩擦磨损性能和磨损机制。结果表明,复合材料制动盘中SiC颗粒分布较为均匀,且可作为共晶Si形核基底,共晶Si可直接在SiC表面形核和长大。在20 N以下载荷范围内,材料磨损率总体上随载荷的增加而增大,但在低载荷区(5~10 N)和高载荷区(15~20 N)增加快些,而在10~15 N载荷区增加较缓慢,平均摩擦系数则随着载荷增加而呈缓慢下降趋势,但均在0.55~0.7范围内变化,滑动摩擦磨损过程中存在氧化。磨损面截面存在由于塑性流动形成的机械混合物层,混合物层中存在裂纹,且在交变载荷下逐步扩展形成剥落磨屑。因此,全载荷范围内存在氧化磨损、疲劳磨损,且载荷增加时,疲劳磨损成为主要磨损机制。
The SiCP/A356 composites high-speed train brake disc was prepared by differential pressure casting.Samples were taken from the brake disc and the microstructure was studied in detail.A pin disc friction and wear test method was used to system research the sliding friction and wear performance at 200℃ambient temperature,the wear mechanism was also discussed.The results show that,Si C particles in the composite brake disc are evenly distributed and can be used as nuclear base for eutectic,the eutectic Si can be directly nucleated on the surface of Si C and grow up.Under 20 N load range lower than 20 N,the material’s wear rate generally increases with the increase of load,but in 5-10 N and 15-20 N,it increases faster than that in 10-15 N.The friction coefficient decreases with the increase of the load,but it is in the range of 0.55-0.70.There is oxidation in the process of sliding friction and wear.There is a mechanical mixture layer developed by plastic flow on the cross section of wear surface,and the crack in the mixture layer gradually expands to form the peeling debris under the alternating load.Therefore,the oxidative wear and fatigue wear occur in the full load range,and the fatigue wear becomes the main wear mechanism when the load increases.
作者
王召明
谢煌
李晓文
金云学
WANG Zhaoming;XIE Huang;LI Xiaowen;JIN Yunxue(School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)
出处
《热加工工艺》
北大核心
2021年第16期56-61,65,共7页
Hot Working Technology
关键词
SIC
复合材料
制动盘
摩擦磨损
机制
SiC
composite material
brake disc
friction wear
mechanism
作者简介
王召明(1995-),男,四川巴中人,主要从事金属基复合材料、摩擦磨损等方面的研究,电话:18852863669,E-mail:958515309@qq.com;通讯作者:金云学(1964-),黑龙江哈尔滨人,教授,博士,主要从事金属基复合材料、摩擦磨损等方面的研究,E-mail:jinyunxue@126.com。
