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摘要:
为改善金属Zn的摩擦磨损性能，采用热压法制备Cr2AlC陶瓷颗粒增强Zn基复合材料，并研究了Cr2AlC质量分数对复合材料的金相组织、维氏硬度、相对密度及摩擦磨损性能的影响。结果表明，复合材料的硬度随着Cr2AlC质量分数的适量增加而明显升高。当Cr2AlC的质量分数达到20%时，复合材料的硬度是纯Zn的1.52倍。摩擦磨损实验表明，Cr2AlC颗粒的引入，可显著改善复合材料的摩擦磨损性能，摩擦系数由纯Zn的0.75降到Zn-20%Cr2AlC的0.65，Zn-30%Cr2AlC的磨损率相比纯Zn下降了80.54%。分析磨损表面形貌，得出其磨损类型为磨粒磨损和剥层磨损。
Abstract:In order to improve the friction and wear properties of Zn, Cr2AlC ceramic particle reinforced Zn matrix composites were prepared by hot pressing method. The effects of Cr2AlC content on the metallographic structure, Vickers-hardness, relative density and tribological properties of the Zn-based composites were investigated. The results show that the hardness of the composites is improved obviously with the proper increase of Cr2AlC content. When the mass fraction of Cr2AlC reaches 20%, the hardness of the composite is 1.52 times higher than that of pure Zn. The introduced Cr2AlC particles can significantly improve the tribological properties of the composites. The friction coefficient decreases from 0.75 in pure Zn to 0.65 in Zn-20%Cr2AlC, and the wear rate of Zn-30%Cr2AlC is reduced by 80.54% compared to pure Zn. Analysis on the worn surface morphology indicates that the wear mechanism is abrasive wear and delamination wear.
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图 3 纯Zn及复合材料的硬度和相对密度
Figure 3. Vickers-hardness and relative density of pure Zn and composites
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