碳组分对轨道交通C/C-SiC制动盘摩擦性能的影响  

Influence of carbon components on the friction performance of C/C-SiC brake discs for high speed trains

作　　者：吴小军[1] 张栖岩 史耀君 杨云鹏 庞菲[1] 胡一杰 WU Xiaojun;ZHANG Xiyan;SHI Yaojun;YANG Yunpeng;PANG Fei;HU Yijie(Xi’an Aerospace Composites Research Institute,Xi’an,Shaanxi 710025,China;CRRC Qishuyan Institute Co.,Ltd.,Changzhou,Jiangsu 213011,China)

机构地区：[1]西安航天复合材料研究所,陕西西安710025 [2]中车戚墅堰机车车辆工艺研究所股份有限公司,江苏常州213011

出　　处：《轨道交通材料》2025年第1期10-15,共6页Materials for Rail Transportation System

基　　金：国家自然科学基金(U21B2053)。

摘　　要：采用2.5D无纬布/网胎叠层针刺预制体,通过化学气相渗透、树脂浸渍碳化制备了密度1.40~1.45 g/cm^(3)的热解碳、热解碳-树脂碳组分C/C坯体,再经高温热处理、净尺寸加工及反应熔渗硅获得两种C/C-SiC制动盘,分析了碳组分对C/C-SiC材料物相含量、微观结构的影响;通过1∶4高速列车台架试验,对比研究了两种C/C-SiC制动盘匹配粉末冶金闸片,在不同制动压力、制动速度下的摩擦性能。结果表明,不同碳组分材料的陶瓷化性能有一定差异,树脂碳的引入改善了孔隙结构,产生均匀的陶瓷相,残留Si少,制备的C/C-SiC更致密。在50~300 km/h制动速度下,摩擦因数变化呈先快速上升后缓慢下降再逐渐平稳的趋势,150 km/h制动速度下两种制动盘摩擦因数均接近峰值;随着制动压力增加,热解碳组分C/C-SiC盘的摩擦因数呈下降趋势,热解碳+树脂碳双组分C/C-SiC盘的摩擦因数稳定在0.60~0.72。A 2.5D needle-punched preform fabricated by alternating layer of non-woven carbon and carbon felt is used as the structure reinforcement,followed by chemical vapor infiltration and resin impregnation carbonization,two types of carbon/carbon(C/C)com⁃posite substrates(pyrolytic carbon or pyrolytic carbon with resin carbon)with a density of 1.40-1.45 g/cm^(3)are prepared.Then two types of C/C-SiC brake discs are manufactured on the basis of the C/C substrates after high temperature heat treatment,near-net shape processing and reactive silicon infiltration.The influence of carbon component on phase content and the microstructure of C/C-SiC material are analyzed.The frictional properties of the two types of PM brake pads matching the C/C-SiC brake discs under different braking pressure and speed are compared and studied by means of a 1∶4 bench test for high-speed train.The results show some differ⁃ences in the ceramicization performance of C/C substrates with different carbon compositions.The introduction of resin carbon improves the pore structure,leading to a uniform ceramic phase,less residual silicon and a C/C-SiC structure with higher density.At the bra⁃king speed of 50-300 km/h,the friction coefficient of the two types of brake discs increases rapidly at first,then decreases slowly and became stable gradually.At the braking speed of 150 km/h,the friction coefficient reaches the peak value.With the increase of braking pressure,the frictional coefficient of C/C-SiC brake discs with pyrolytic carbon component decreases,while that of C/C-SiC brake discs with a bi-component of pyrolytic carbon and resin carbon remains stable at the level of 0.60 and 0.72.

关 键 词：碳组分 摩擦性能 C/C-SiC制动盘 反应熔渗 微结构 

分 类 号：U270.35[机械工程—车辆工程] U270.4[交通运输工程—载运工具运用工程]