爆炸喷涂 WC-12CO 自润滑耐磨涂层工艺及 性能研究. (Chinese)

Technology and Properties of WC-12Co Self-lubricating Wear-resistant Coating by Explosive Spraying. (English)

Aiming to reduce the friction coefficient of WC-12Co wear-resistant coating,a self-lubricating coating was developed by adding graphene to WC-12Co coating deposited via detonation gun spraying. In this study, four powder processes, including wet ball milling, wet mixing, spray granulation, and sintering and crushing, were used to obtain grapheneAVC-12Co composite powders. The micro structure and phase composition of graphene in powder and coating were analyzed by SEM, EDS and Raman. The mechanical properties of the coating were studied by the microhardness tester and the universal tensile machine. Results show that the spray granulation process is used to prepare the composite powder,a greater amount of graphene covers the surface of the WC-12Co powder, and the transparent thin-layered structure of the graphene remains unchanged. The bonding strength and hardness (HV0 3) of the resultant coating are approximately 68 MPa and 940, respectively. Graphene modification causes a 25% reduction in the friction coefficient. During the friction process, the graphene constantly forms a lubricating film that serves as an excellent self-lubricating layer. [ABSTRACT FROM AUTHOR]

为了降低WC-12CO耐磨涂层的摩擦系数，采用4种制粉工艺（湿法球磨、湿法搅拌、烧结破碎、喷雾 造粒）将石墨烯复合于WC-12CO粉末中，采用爆炸喷涂技术制备了石墨烯自润滑耐磨涂层。利用SEM、EDS、 Raman等分析了不同制粉工艺获得粉末及涂层中石墨烯的组织形貌、物相组成。利用显微硬度计、万能拉伸机研 究了涂层的力学性能。利用UMT-3摩擦磨损试验机研究了涂层的摩擦磨损性能。结果表明，喷雾造粒工艺制备 的复合粉末中石墨烯在WC-12CO颗粒表面均匀、紧密粘附，涂层内部石墨烯含量较高，且仍以透明状、薄层状 态嵌合在组织内部，结合强度约68MPa，硬度HVQ.3约9400 MPa，相比原始WC-12Co涂层，石墨烯改性涂层摩 擦系数降低约25%，石墨烯在摩擦过程中不断裸露于磨痕表面，在微区内形成润滑膜，起到较好的自润滑、减磨 效果. [ABSTRACT FROM AUTHOR]

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