粉末冶金制备ZrO_(2)颗粒增强镁基复合材料的组织和磨损性能  

Microstructure and Wear Properties of ZrO_(2) Particle Reinforced Magnesium-based Composites Prepared by Powder Metallurgy

作　　者：翟会丽 ZHAI Huili(School ofMechanical and Electrical Engineering,Zhengzhou University of Finance and Economics,Zhengzhou 450044,China)

机构地区：[1]郑州财经学院机电与汽车工程学院,河南郑州450044

出　　处：《热加工工艺》2022年第8期75-78,共4页Hot Working Technology

基　　金：河南省高校重点科研项目(20B880046)。

摘　　要：采用粉末冶金法制备了不同质量分数氧化锆(ZrO_(2))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:ZrO_(2)颗粒在一般条件下都可能发生凝聚。除ZrO_(2)外,复合材料的结构内还包含Mg和Mg_(17)Al_(12)。加入ZrO_(2)颗粒能够有效的提高ZrO_(2)/AZ91复合材料的硬度和耐磨性;30wt%ZrO_(2)/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%ZrO_(2)/AZ91复合材料的磨损率为176.2 mm^(3)/(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。AZ91 magnesium matrix composites with different mass fraction zirconia(ZrO_(2)) 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 ZrO_(2) particles under normal conditions.Mg and Mg_(17)Al_(12) are included in the structure of the composite in addition to the ZrO_(2).The addition of ZrO_(2) particles can effectively improve the hardness and wear resistance of ZrO_(2)/AZ91 composites.The hardness of the 30wt%ZrO_(2)/AZ91 composite is 108.7 HV.Compared with the matrix AZ91 alloy,the hardness increases by about 22%.The wear rate of 30wt%ZrO_(2)/AZ91 composites under 20 N load is 176.2 mm^(3)/(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.

关 键 词：ZrO_(2)颗粒 镁基复合材料 粉末冶金 热压烧结 微观组织 耐磨性 

分 类 号：TB333.12[一般工业技术—材料科学与工程]