Mo5Si3-20% Al2O3p复相陶瓷的制备及摩擦磨损性能
Preparation and Friction-Wear Property of Mo5Si3-20% Al2O3p Ceramic Composite
摘 要
采用机械球磨/热压烧结法制备了Mo5Si3金属陶瓷和Mo5Si3-20%（质量分数，下同） Al2O3p复相陶瓷，利用X射线衍射仪、扫描电子显微镜、硬度计和摩擦磨损试验机等分析了其微观结构、力学性能和摩擦磨损性能。结果表明：Mo5Si3-20% Al2O3p复相陶瓷的主要物相为Mo5Si3、Al2O3和少量Mo3Si；复相陶瓷的相对密度、硬度和断裂韧性均高于单相Mo5Si3金属陶瓷的，且其摩擦因数和磨损率较低，摩擦因数随时间的变化较平缓，表现出更好的摩擦磨损性能；与GCr15钢球对磨时，Mo5Si3金属陶瓷的主要磨损机制为黏着和疲劳剥落，Mo5Si3-20% Al2O3p复相陶瓷的则为磨粒磨损，二者同时存在氧化磨损。
磨损性能
磨损机理
Mo5Si3-Al2O3p ceramic composite
wear behavior
wear mechanism
Abstract
Mo5Si3 cermet and Mo5Si3-20wt% Al2O3p ceramic composite were prepared by mechanical milling and hot-pressing sintering. And then the microstructure, mechanical and friction-wear properties were analyzed by using X-ray diffractometer, scanning electron microscopy, hardness tester, friction-wear testing machine, etc. The results show that the Mo5Si3-20wt% Al2O3p ceramic composite was mainly composed of Mo5Si3, Al2O3 and few Mo3Si phases. The relative density, hardness and fracture toughness of the ceramic composite were higher than those of the single-phase Mo5Si3 cermet. Furthermore, the friction coefficient and wear rate of the ceramic composite were lower and the changing of friction coefficient with the time was smoother, showing a better friction and wear resistance. When grinding with GCr15 steel ball, the main wear mechanism of the Mo5Si3 cermet was adhesive wear and spalling fatigue, while that of Mo5Si3-20wt% Al2O3p ceramic composite was abrasive wear. Both had an oxidation wear.
中图分类号 TG146.4 DOI 10.11973/jxgccl201710006
所属栏目 新材料 新工艺
基金项目 山东省自然科学基金资助项目（BS2015CL007）；中国博士后科学基金资助项目（2015M572026）
收稿日期 2016/9/6
修改稿日期 2017/8/2
网络出版日期
作者单位点击查看
备注薛茂超(1982-),男,河南封丘人,讲师,硕士
引用该论文: XUE Maochao,ZHANG Hongxia,CHEN Hui. Preparation and Friction-Wear Property of Mo5Si3-20% Al2O3p Ceramic Composite[J]. Materials for mechancial engineering, 2017, 41(10): 24～27
薛茂超,张红霞,陈辉. Mo5Si3-20% Al2O3p复相陶瓷的制备及摩擦磨损性能[J]. 机械工程材料, 2017, 41(10): 24～27
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