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研究了锐钛矿(TiO_2)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TiO_2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TiO_2在基体中分布均匀。定量分析表明,随着TiO_2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TiO_2的高硬度有关。磨屑的SEM组织表明随着TiO_2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。
The effect of anatase (TiO 2) content on the wear properties and microhardness of aluminum matrix composites was studied. Al-15% SiC composites with different content of TiO 2 (0,4%, 8%, 12%, mass fraction) were prepared by powder metallurgy method. In the dry friction conditions, the disc - pin device wear test. The preform was characterized by X-ray diffraction, scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The optical microstructure of the composite shows that the TiO 2 is uniformly distributed in the matrix. Quantitative analysis shows that with the increase of TiO 2 content, the wear resistance and microhardness of the composites increase. SEM microstructure revealed that the high wear resistance of the composites was related to the high dislocation density of deformable surface and the high hardness of TiO_2. The SEM microstructure of wear debris shows that the size of wear debris decreases with the increase of TiO 2 content. Energy spectrum analysis confirmed that the formation of oxide layer can significantly reduce the effective contact area of the friction surface, thereby reducing the wear of the composite material. Delamination and adhesive wear are the main wear mechanisms.