氧化石墨烯改性自润滑耐磨涂层的组织与耐磨机理

Microstructure and Wear Behavior of Graphene Oxide Modified Self-lubricated Wear Resistant Coating

为了降低WC-Co涂层的摩擦系数,采用湿法球磨工艺实现了氧化石墨烯(Graphene Oxide,GO)和WC-Co喷涂粉末的均匀混合,基于爆炸喷涂技术制备了氧化石墨烯改性WC-Co涂层。借助XRD、SEM、EDS等手段分析了涂层的氧化石墨烯存在、组织结构形貌、化学成分组成。采用显微硬度计、万能拉伸机及UMT-2摩擦磨损试验机等研究了涂层的力学及摩擦磨损性能。结果表明:氧化石墨烯改性后涂层内均匀分布有片层状氧化石墨烯,涂层组织致密、均匀,结合强度约82 MPa,显微硬度HV0。3为10062 MPa,氧化石墨烯改性后涂层相比WC-Co涂层摩擦系数降低了30%,氧化石墨烯的添加提高了WC-Co涂层的抗磨、减磨性能。

Aiming to reduce the friction coefficient of WC-Co coating, the grapheme oxide（GO） and WC-Co spraying powder were uniformly mixed by wet milling. The GO modified WC-Co coating was prepared by detonation gun spraying. The existence of GO, microstructure and chemical composition of the coating were analyzed by XRD, SEM and EDS instrument. Mechanical and wear properties of the coating were studied by micro-hardness tester, universal tensile machine and wear testing machine. The results show that laminar GO exists in the GO modified WC-Co coating. The coating has the dense and uniform structure. The adhesive strength and micro-hardness of the coating is 82 MPa and 10062 MPa, respectively. The friction coefficient of the GO modified WC-Co coating is decreased by 30% compared with that of the WC-Co coating. The addition of GO highly improves the wear resistance of the WC-Co coating.