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采用超音速火焰喷涂和焊条电弧焊在Q345钢基体表面分别制备了WC–10Co–4Cr复合涂层和04Cr13Ni5Mo合金堆焊层,测量了2种涂层的显微硬度、孔隙率、断裂韧性和表面粗糙度,并对2种涂层的显微组织和耐泥沙冲蚀磨损性能进行了对比研究。结果表明,二者的体积冲蚀磨损率均随时间延长而增加。在低角度冲蚀磨损条件下,复合涂层的耐泥沙冲蚀磨损性能明显优于堆焊层,涂层的硬度和强度是耐泥沙冲蚀磨损的主要影响因素。在高角度冲蚀磨损条件下,2种涂层的耐泥沙冲蚀磨损性能相差不大,涂层的断裂韧性是主要影响因素。WC–10Co–4Cr复合涂层表现出偏脆性材料的冲蚀磨损特性,04Cr13Ni5Mo堆焊层则表现出典型塑性材料的冲蚀磨损特性。
WC-10Co-4Cr composite coating and 04Cr13Ni5Mo alloy overlay were prepared on the surface of Q345 steel by supersonic flame spraying and electrode arc welding. The microhardness, porosity, fracture toughness and surface Roughness, and compared the microstructure and erosion resistance of the two coatings. The results show that both the volume erosion wear rate increases with time. Under low-angle erosion wear conditions, the wear resistance of the composite coating is better than that of the surfacing layer. The hardness and strength of the composite coating are the main factors affecting the erosion and erosion wear resistance. Under the conditions of high-angle erosive wear, the erosion resistance of the two kinds of coatings shows little difference between them. The fracture toughness of the coatings is the main factor. WC-10Co-4Cr composite coating showed brittle erosion erosion characteristics of materials, 04Cr13Ni5Mo surfacing layer shows the typical plastic material erosion wear characteristics.