莫来石纤维含量对陶瓷基摩擦材料摩擦磨损性能的影响

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Ceramic-based friction material with 0%-24%（mass fraction） mullite fiber reinforcement was prepared by nitrogen protection hot-pressing sintering.The effect of mullite fiber content on friction and wear properties of ceramic-based friction material was studied on the XD-MSM constant speed friction tester.The worn surfaces morphology after tests was observed by scanning electron microscopy（SEM）,and wear mechanism was discussed.The results show that mullite fiber could increase friction coefficients of ceramic-based friction material,and with increasing mullite fiber contents,friction coefficients continuously increase.While the wear rates also increase with increasing mullite fiber contents at high temperature.The dominant wear mechanism of ceramic-based friction material without mullite fiber is brittle spalling and fatigue wear,accompanying with abrasive wear;the main wear type converts into adhesion wear and abrasive wear when adding mullite fiber into ceramic friction material.利用氮气保护热压烧结法制备含0～24（质量分数）莫来石纤维增强陶瓷基摩擦材料,采用XD-MSM型定速摩擦试验机研究莫来石纤维含量对摩擦材料摩擦磨损性能的影响,借助于扫描电子显微镜观察实验后试样的磨损表面形貌,并探讨其磨损机理。结果表明：莫来石纤维的加入能够显著提高陶瓷基摩擦材料的摩擦因数,且随莫来石纤维含量增加而增大。在高温下,陶瓷基摩擦材料的磨损率随莫来石纤维含量增加而增大。未添加莫来石纤维的陶瓷基摩擦材料磨损形式主要是脆性脱落和疲劳磨损,伴有磨粒磨损;而添加莫来石纤维的陶瓷基摩擦材料磨损形式转化为黏着磨损和磨粒磨损。