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采用激光熔覆-离子渗硫复合新工艺在45钢表面制备减磨耐磨性能良好的自润滑涂层。采用扫描电子显微镜、原子力显微镜、白光共焦三维轮廓仪、X射线衍射仪、X射线光电子能谱仪分析涂层及磨损表面的形貌、成分及相组成。在球盘式摩擦磨损实验机上对比研究渗硫前后熔覆层在干摩擦条件下的摩擦磨损性能。结果表明,采用离子渗硫在高硬度镍基合金激光熔覆层表面生成了硫化物固体润滑膜层,渗硫层表面疏松多孔,与熔覆层结合紧密;经渗硫处理后激光熔覆层的耐磨减摩性能提高,对磨件的磨损也明显改善;磨损表面生成了由硫化物和氧化物组成的边界润滑膜。
A new self-lubricating coating with anti-abrasion and anti-abrasion properties was prepared on the surface of 45 steel by laser cladding-ion sulphurizing composite process. The morphology, composition and phase composition of the coating and wear surface were analyzed by scanning electron microscopy, atomic force microscopy, white light confocal three-dimensional profiler, X-ray diffraction and X-ray photoelectron spectroscopy. The friction and wear properties of the coating before and after infiltration under dry friction conditions were compared on a ball disc friction and wear tester. The results show that the sulphide solid lubricant film is formed on the surface of the laser cladding layer of high hardness Ni-based alloy by ion infiltration, the surface of the sulphide layer is loose and porous, and the cladding layer is tightly bonded with the cladding layer. After the laser cladding layer Wear-resistant and antifriction properties are improved, and the abrasion of the wear parts is also obviously improved; the boundary lubricating film formed by the sulfide and the oxide is formed on the worn surface.