研究了锐钛矿(TiO2)含量对铝基复合材料磨损性能和显微硬度的影响.采用粉末冶金方法制备不同TiO2含量(0,4％,8％,12％,质量分数)的Al-15％SiC复合材料.在干摩擦条件下,采用盘-销装置进行磨损试验.采用X射线衍射仪、扫描电子显微镜(SEM)和能谱仪(EDS)对预制品进行表征.复合材料的光学显微组织表明TiO2在基体中分布均匀.定量分析表明,随着TiO2含量的增加,复合材料的抗磨损性能和显微硬度提高.SEM显微组织揭示了复合材料的高抗磨损性能与变形面的高位错密度和TiO2的高硬度有关.磨屑的SEM组织表明随着TiO2含量的增加,磨屑的尺寸逐渐减小.能谱分析证实氧化层的形成能明显地减小摩擦表面的有效接触面积,进而减小复合材料的磨损.分层和黏附磨损是主要的磨损机理.
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