北京航空航天大学学报 ›› 2018, Vol. 44 ›› Issue (4): 874-878.doi: 10.13700/j.bh.1001-5965.2017.0298

• 论文 • 上一篇    下一篇

Zn-Cr2AlC复合材料的制备与摩擦磨损性能

李志, 赵文月, 缪奶华   

  1. 北京航空航天大学材料科学与工程学院, 北京 100083
  • 收稿日期:2017-05-11 出版日期:2018-04-20 发布日期:2018-04-27
  • 通讯作者: 缪奶华 E-mail:nhmiao@buaa.edu.cn
  • 作者简介:李志,男,硕士研究生。主要研究方向:金属基复合材料;缪奶华,男,博士,副教授,硕士生导师。主要研究方向:高熔点结构材料、计算材料学等。
  • 基金资助:
    国家自然科学基金(51571008)

Preparation and tribological properties of Zn-Cr2AlC composites

LI Zhi, ZHAO Wenyue, MIAO Naihua   

  1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2017-05-11 Online:2018-04-20 Published:2018-04-27
  • Supported by:
    National Natural Science Foundation of China (51571008)

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。

关键词: Cr2AlC, Zn基复合材料, 维氏硬度, 组织形貌, 摩擦磨损性能

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.

Key words: Cr2AlC, Zn matrix composites, Vickers-hardness, microstructure and morphology, tribological properties

中图分类号: 


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