【摘要】 以Ni60A自熔合金粉末和微、纳米碳化钨粉末为原料,利用感应熔敷技术在Q235钢表面制备了微、纳米碳化钨复合材料耐磨涂层;利用扫描电子显微镜、能量色散谱仪及X射线衍射仪观察分析了复合材料涂层的显微组织结构;考察了复合材料涂层在室温滑动干摩擦条件下的耐磨性能.结果表明:复合材料涂层主要由团聚状纳米碳化钨颗粒、微米WC颗粒和γ-Ni固溶体组成,其组织结构均匀,与基体之间形成完全冶金结合;复合材料涂层在滑动干摩擦条件下表现出优异的耐磨性能及良好的承载能力,其磨损率随载荷增加变化不大,这主要归因于微米WC增强相和团聚状纳米WC增强相的良好固溶强化、弥散强化及细晶强化作用.更多还原

【Abstract】 Ni-based composite coating reinforced with micro- and nano-WC particulates was fabricated on Q235 steel by induction cladding, using the powders of Ni60 alloy and micro-and nano-WC as the raw materials. The microstructure of the composite coating was characterized by means of scanning electron microscopy, X-ray diffraction, and energy dispersive spectroscopy. The wear resistance of the composite coating sliding against AISI1045 steel in a ring-on-block configuration under unlubricated condition was evaluated using an MM-200 test rig. It was found that the induction clad Bi-based composite coating had a rapidly solidified homogeneous microstructure consisting of accumulated nano-WC particles and micron WC particles uniformly distributed in the γ-Ni solid solution matrix and was metallurgically bonded to the substrate. This accounted for the high hardness and excellent wear resistance of the induction clad Ni-based composite coating under dry sliding condition. Namely, the excellent eutectic strengthening effect, diepersive strengthening effect, and refining effect of the micro-and nano-WC particles uniformly distributed in the Ni-matrix contributed to greatly increase the hardness and wear-resistance of the Ni-based composite coating.更多还原