高速电弧喷涂FeCrNi/Ni包覆金刚石复合涂层的摩擦学特性研究

Tribological Properties of FeCrNi/Ni Coated Diamond Composite Coating Prepared by High-velocity Arc Spraying

目的研究高速电弧喷涂FeCrNi/Ni包覆金刚石复合涂层的组织结构和摩擦学特性。方法采用高速电弧喷涂技术在45#钢基体上制备FeCrNi/Ni包覆金刚石复合涂层,并对其进行滑动摩擦磨损研究,利用SEM,EDS对涂层的形貌、组织成分进行分析,测定涂层的显微硬度、孔隙率等。结果 FeCrNi/Ni包覆金刚石复合涂层组织致密,孔隙率较低,呈现典型的层状结构。涂层的摩擦系数随着磨损时间的增加而先增大,再趋于平稳。结论由于涂层中加入了金刚石硬质相,涂层具有较高的显微硬度和优异的耐摩擦磨损性能。

Objective To study the structure and tribological properties of the FeCrNi/ Ni coated diamond composite coating by high-velocity arc sprayed. Methods FeCrNi/ Ni coated diamond composite coating was prepared on 45# steel substrates by high-velocity arc sprayed. MMW-1A wear-test machine was used to analyze the tribological properties of the composite coating. Morphology, composition and cross-section microstructure of the coatings were analyzed by the means of scanning electron microscopy （SEM）, and energy dispersive spectrometry （EDS）. The microhardness and porosity of coatings were also tested. Results This research indicated that the FeCrNi/ Ni coated diamond composite coatings had typical layer structure characteristics and lower porosity. With the increase of sliding time, the friction coefficient of the coatings first increased and then tended to be stable. Conclu-sion The coating had high microhardness and excellent wear resistance because of the addition of ultrohard diamond.