粉末冶金制备ZrO2颗粒增强镁基复合材料的组织和磨损性能

    Microstructure and Wear Properties of ZrO2 Particle Reinforced Magnesium-based Composites Prepared by Powder Metallurgy

      摘要
    • 摘要: 采用粉末冶金法制备了不同质量分数氧化锆（ZrO2）颗粒增强的AZ91镁基复合材料，并采用扫描电子显微镜（SEM）、能量色散谱仪（EDS）、X射线衍射仪（XRD）和硬度仪等手段研究了该复合材料的微观组织、硬度、密度和耐磨性。结果表明：ZrO2颗粒在一般条件下都可能发生凝聚。除ZrO2外，复合材料的结构内还包含Mg和Mg17Al12。加入ZrO2颗粒能够有效的提高ZrO2/AZ91复合材料的硬度和耐磨性；30wt%ZrO2/AZ91复合材料的硬度为108.7 HV，相比基体AZ91合金，硬度提高了约22%。在20N载荷下，30 wt%ZrO2/AZ91复合材料的磨损率为176.2 mm3/（N·m），相比基体AZ91合金，磨损率降低了约28%。复合材料主要的磨损机制为磨粒磨损和氧化磨损。

       

      Abstract: AZ91 magnesium matrix composites with different mass fraction zirconia（ZrO2） particles reinforced by powder metallurgy were prepared. The microstructure, hardness, density and wear resistance of the composite were studied by scanning electron microscope（SEM）, energy dispersive spectrometer（EDS）, X-ray diffractometer（XRD） and hardness tester.The results show that condensation may occur in ZrO2 particles under normal conditions. Mg and Mg17Al12 are included in the structure of the composite in addition to the ZrO2. The addition of ZrO2 particles can effectively improve the hardness and wear resistance of ZrO2/AZ91 composites. The hardness of the 30wt% ZrO2/AZ91 composite is 108.7 HV. Compared with the matrix AZ91 alloy, the hardness increases by about 22%. The wear rate of 30wt%ZrO2/AZ91 composites under 20 N load is 176.2 mm3/（N·m）. Compared with the matrix AZ91 alloy, the wear rate decreases by about 28%. The main wear mechanism of the composites is abrasive wear and oxidation wear.

       

      • HTML全文
      • 参考文献(12)
      • 相关文章
      • 施引文献
    • 资源附件(0)

    /

    返回文章
    返回
    邮件订阅 RSS