钢纤维对陶瓷基摩擦材料摩擦学性能的影响

以钢纤维为增强材料,采用氮气保护烧结方法制备出了钢纤维增强陶瓷基摩擦材料,用XD-MSM型定速摩擦磨损试验机对比研究了不同钢纤维含量对陶瓷基摩擦材料的热衰退性能、恢复性能以及磨损性能的影响,利用扫描电子显微镜(SEM)观察磨损表面形貌,并探讨了其磨损机理.研究结果表明:钢纤维的添加量(质量百分数)为24%时,钢纤维同陶瓷基体界面结合良好,陶瓷基摩擦材料的耐磨性能有所提高,热衰退率仅为5.8%,恢复率达到了107.8%,表明此配方陶瓷基摩擦材料具有较高的抗热衰退性能和恢复性能;钢纤维的含量影响陶瓷基摩擦材料的磨损形式,当含钢纤维含量较少时,陶瓷基摩擦材料以脆性脱落和疲劳磨损混合磨损形式为主;而随添加钢纤维含量的增多,其磨损形式转变为磨粒磨损;钢纤维过量加入时,则主要磨损形式为脆性脱落和疲劳磨损,并伴有黏着磨损.

Effects of Steel Fiber on Tribological Properties of Ceramic-Based Friction Material

Steel fiber reinforced ceramic-based friction material is prepared by nitrogen protection sintering method. The effects of steel fiber content on fade, recovery and wear performance of the ceramic-based friction material are studied and compared using XD-MSM constant speed friction tester. The worn surface morphology is observed by using scanning electron microscopy (SEM), and wear mechanism is discussed. The results show that the interface between steel fiber and ceramic matrix is good, the wear resistance of the friction material with a steel fiber content of 24% is improved. The fade ratio is as low as 5.8% and the recovery ratio is 107.8%, showing the excellent performances of heat fading resistance and recovery of the friction material. SEM analysis shows that steel fiber content has impact on the main wear mechanism of ceramic-based friction material. The main wear mechsanisms of ceramic-based friction material with a low steel fiber content are brittle spalling and fatigue wear. By increasing steel fiber content, the main wear mechanism is abrasive wear. Further increasing steel fiber content, the wear mechanisms of ceramic-based friction material are brittle spalling and fatigue wear accompanying with adhesion wear.