镍包石墨自润滑涂层的制备及性能  

Preparation and properties of nickel coated graphite self lubricating coating

作　　者：任良帅 李敏[1] 迟静[1] 王淑峰[1] REN Liang-shuai;LI Min;CHI Jing;WANG Shu-feng(College of Materials Science and engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学材料科学与工程学院,山东青岛266590

出　　处：《材料热处理学报》2018年第12期97-102,共6页Transactions of Materials and Heat Treatment

摘　　要：为增强涂层与基体结合强度及减少基体对减摩相的稀释作用,利用激光熔敷技术在Q235钢表面制备了镍包石墨自润滑双层涂层。通过显微硬度计对涂层截面进行硬度测试;利用摩擦磨损试验机检验涂层摩擦性能;运用高分辨扫描电镜、X射线衍射仪等分析手段对涂层表面磨痕形貌、磨损类型进行综合分析。结果表明:镍包石墨自润滑涂层熔敷层显微硬度为600～750 HV;涂层摩擦系数在0.38～0.41之间,且随载荷增大而减小。载荷为10 N时,发生黏着磨损;30 N时,出现氧化磨损;50 N时,氧化物的断裂为主要的磨损方式。镍包石墨减摩相的添加,有效改善涂层减摩性能;而涂层与基体结合良好,无气孔、夹杂现象,减少了熔敷过程中石墨的氧化分解。In order to enhance the bonding strength of the coating to the substrate and reduce the dilution effect of the substrate on the antifriction phase, the Ni-coated graphite self-lubricating double-layer coating was prepared on the Q235 steel surface by laser cladding technique. The hardness of the coating cross section was tested by microhardness tester, the friction and wear properties of the coating were tested by friction and wear tester, and the wear surface morphology and wear type of the coating were analyzed by means of high resolution scanning electron microscopy and X-ray diffractometer. The results show that the micro-hardness of the Ni-coated graphite self-lubricating coating is between 600-750 HV; and the friction coefficient of the coating is between 0.38 and 0.41, and decreases with the increase of load. When the load is 10 N, adhesive wear occurs, oxidation wear occurs at 30 N, and the fracture of oxide is the main wear mode at 50 N. The addition of anti-friction phase of Ni-coated graphite can effectively improve the antifriction performance of the coating, while the coating has good bonding with the substrate, no porosity and inclusions, which reduces the oxidation and decomposition of graphite during the laser cladding process.

关 键 词：激光熔敷 镍基合金 镍包石墨 磨损类型 

分 类 号：TG174.44[金属学及工艺—金属表面处理]