激光选区熔化成型CoCrMo合金摩擦学性能研究  

Study on Tribology Performance of CoCrMo Alloy Parts Manufactured by Selective Laser Melting

作　　者：张国庆[1] 杨永强[1] 林辉[1] 宋长辉[2] 张自勉[1] 余家阔[2] 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640 [2]北京大学第三医院运动医学研究所,北京100083

出　　处：《中国激光》2016年第8期167-176,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(81327001;51275179);广东省重大科技专项(2016B090914002;2014B010131003;2015B090920002);广州市产学研协同创新重大专项(201604010045)

摘　　要：应用摩擦磨损试验机进行摩擦磨损实验并对实验前后零件称重以分析其在不同条件下摩擦系数和磨损率的变化;对零件实验前后表面组织和形貌采用金相显微镜和扫描电子显微镜分别进行观察以研究其磨损机理。结果表明,在干摩擦、氯化钠(NaCl)和人工唾液润滑条件下,SLM成型件正面的磨损率比铸造件分别低27.92%、21.15%和19.03%,比侧面分别低26.97%、10.88%和14.97%;SLM成型件与铸造件相比,表面组织更加均匀,基本无孔洞;在干摩擦下表现为磨粒磨损,在NaCl及人工唾液润滑条件下主要表现为磨粒磨损和疲劳磨损。The friction wear testing machine is applied in the friction and wear experiments and the weight of the parts before and after experiments are compared in order to investigate the variance of friction coefficients and wear rates under different conditions. In order to study the wear mechanism, the surface structure and morphology of CoCrMo parts before and after experiments are observed by the metalloscope and the scanning electron microscope, respectively. The results show that, under the respective lubrication condition of dry friction, sodium chloride （NaCl） or artificial saliva, the wear rate of the front face of the SLM manufactured parts is 27.92% , 21.15% or 19.03% lower than that of the casting parts, and 26. 97%, 10.88% or 14.97% lower than that of the lateral face. Compared with casting parts, the SLM manufactured parts have a uniform surface structure on which there nearly no holes. Under the condition of dry friction, abrasive wear dominates. In contrast, under the lubrication conditions of NaCl and artificial saliva, abrasive wear and fatigue wear dominate.

关 键 词：激光技术 钴铬钼合金 激光选区熔化 摩擦系数 磨损率 表面形貌 

分 类 号：TG15[金属学及工艺—热处理] TG66[金属学及工艺—金属学]