石墨烯对激光熔覆镍基碳化钨涂层组织及性能影响

Effect of graphene on the microstructure and properties of nickel-based tungsten carbide coatings by laser cladding

摘要: 采用激光熔覆技术在Q235钢基体上制备Ni60A-30%WC-x%石墨烯(质量分数, x=0.0, 0.1, 0.3, 0.5)涂层, 研究石墨烯对激光熔覆镍基碳化钨涂层组织与性能的影响。结果表明, 涂层物相主要由具有γ相结构的Ni-Cr-Fe固溶体、WC、W₂C、Cr₇C₃、Cr₂₃C₆、B₄C等组成; 石墨烯改善了激光熔覆镍基碳化钨涂层的组织, 提高了涂层的硬度和抗摩擦磨损性能; 当石墨烯质量分数为0.3%时, 得到了析出相分布均匀且细小的组织, 涂层具有高硬度、良好的抗裂纹扩展能力和耐磨性。

Abstract: Ni60-30%WC-x% graphene(mass fraction, x=0.0, 0.1, 0.3, 0.5) coatings were fabricated by laser cladding on the Q235 steel substrates, and the effect of graphene on the microstructure and properties of nickel-based tungsten carbide coatings was investigated. The research shows that the phases of coating samples are mainly composed of Ni-Cr-Fe solid solution with γ phase structure, WC, W₂C、Cr₇C₃、Cr₂₃C₆、B₄C. The graphene improves the microstructures, microhardness, and wear resistance of the laser cladding nickel-based tungsten carbide coatings. Especially, when the graphene content is 0.3% by mass fraction, the coatings show the fine and uniforms microstructures, the higher hardness, and the excellent crack and wear resistance.