Role of titanium carbide and alumina on the friction increment for Cu-based metallic brake pads under different initial braking speeds  

作　　者：Tao PENG Qingzhi YAN Xiaolu ZHANG Yan ZHUANG 

机构地区：[1]Laboratory of Special Ceramics and Powder Metallurgy,School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Friction》2021年第6期1543-1557,共15页摩擦（英文版）

基　　金：Financial support from the National Natural Science Foundation of China(No.51572026)is gratefully acknowledged.

摘　　要：To understand the effect of abrasives on increasing friction in Cu-based metallic pads under different braking speeds,pad materials with two typical abrasives,titanium carbide(TiC)and alumina(Al_(2)O_(3)),were produced and tested using a scale dynamometer under various initial braking speeds(IBS).The results showed that at IBS lower than 250 km/h,both TiC and Al_(2)O_(3) particles acted as hard points and exhibited similar friction-increasing behavior,where the increase in friction was not only enhanced as IBS increased,but also enhanced by increasing the volume fraction of the abrasives.However,at higher IBS,the friction increase was limited by the bonding behavior between the matrix and abrasives.Under these conditions,the composite containing TiC showed a better friction-increasing effect and wear resistance than the composite containing Al_(2)O_(3) because of its superior particle-matrix bonding and coefficient of thermal expansion(CTE)compatibility.Because of the poor interface bonding between the matrix and Al_(2)O_(3),a transition phenomenon exists in the Al_(2)O_(3)-reinforced composite,in which the friction-increasing effect diminished when IBS exceeded a certain value.

关 键 词：high-speed train friction mechanisms brake pads ABRASIVES 

分 类 号：U270.35[机械工程—车辆工程]