Wear property of high-resistivity carbon brushes made with and without MoS_2 in variable humidity  

作　　者：胡忠良 陈振华 夏金童 丁国芸 

机构地区：[1]College of Materials Science and Engineering,Hunan University

出　　处：《中国有色金属学会会刊：英文版》2008年第2期340-345,共6页Transactions of Nonferrous Metals Society of China

基　　金：Project(59972009)supported by the National Natural Science Foundation of China

摘　　要：Four kinds of high-resistivity carbon brushes with MoS2 contents of 0%,2%,4%and 6%(mass fraction)were prepared, respectively.Wear tests of brushes were conducted on an alternate current(AC)motor.Scanning electron microscopy(SEM)and energy dispersive X-ray analysis(EDS)were used to analyze the worn surface of brushes,and a thermocouple was used to measure the bulk temperature of the brush.The results show that wear rate of brush made without MoS2 in 10%relative humidity(RH)is two times larger than that in 50%RH,whereas the wear rates change little for the brushes made with MoS2.The wear of brushes has much to do with the surface film.In low humidity,the surface film can not be formed for the former brush while a sulfur layer can be formed for the latter brushes,which can reduce sparks,frictional heat and wear rate,and play a role like the water film in high humidity.Four kinds of high-resistivity carbon brushes with MoS2 contents of 0%, 2%, 4% and 6% （mass fraction） were prepared, respectively. Wear tests of brushes were conducted on an alternate current（AC） motor. Scanning electron microscopy（SEM） and energy dispersive X-ray analysis（EDS） were used to analyze the worn surface of brushes, and a thermocouple was used to measure the bulk temperature of the brush. The results show that wear rate of brush made without MoS2 in 10% relative humidity（RH） is two times larger than that in 50% RH, whereas the wear rates change little for the brushes made with MoS2. The wear of brushes has much to do with the surface film. In low humidity, the surface film can not be formed for the former brush while a sulfur layer can be formed for the latter brushes, which can reduce sparks, frictional heat and wear rate, and play a role like the water film in high humidity.

关 键 词：高电阻 碳刷 湿度 二硫化钼 合金 

分 类 号：TB302.3[一般工业技术—材料科学与工程]