激光熔覆仿生非光滑表面磨粒磨损性能的研究  

Research on Abrasive Wear Properties of Bionic Non-smooth Coating by Laser Cladding

作　　者：刘敬[1] 高晓丽[1] 徐杨[1] 陈晓敏[1] 凌刚[1] 

机构地区：[1]中国农业大学工学院,北京100083

出　　处：《材料工程》2013年第12期32-36,共5页Journal of Materials Engineering

基　　金："十二五"农村领域国家科技计划课题资助项目(2011BAD20B01)

摘　　要：以鲨鱼盾鳞表面非光滑形态为模型,制备了由镍基合金粉末熔覆层和45钢基体构成的起伏型、平面型仿生非光滑试样,并进行磨粒磨损实验和磨痕观察,分析磨损机理。结果表明:平面型涂层耐磨性明显优于起伏型涂层;设计和制备耐磨性良好涂层的判据是几何硬化率(GHR)不小于50%。起伏型涂层的磨损机理:硬化带表面自身非光滑磨损机制与磨头对硬化带的冲击磨损机制共同作用。平面型涂层的磨损机理:硬化带表面自身非光滑磨损机制与表面几何形貌非光滑磨损机制相结合。On the basis of the morphology of organism＇s surface,bionic non-smooth coatings of wave and plane-type on 45 steel were prepared by laser cladding. The abrasive wear test was carried out with abrasion tester, and the wear scar was observed. The wear mechanism was analyzed. The results show that the wear resistance of plane type coating is remarkably better than that of the wave type. The criterion for designing and preparing a good wear-resistant coating is： geometric hardening rate （GHR） was no less than 50%. The wear mechanism of wave-type coating is that the hardening belt＇s non-smooth surface and the impact of the grinding head function together. The wear mechanism of flat-type coating is the combination of the wear mechanisms of the hardening belt＇s non-smooth sur- face and its non-smooth geometric surface morphology.

关 键 词：激光熔覆 仿生非光滑涂层 磨粒磨损 开沟圆盘 

分 类 号：TG174.453[金属学及工艺—金属表面处理]