关键词: 活性氩弧熔覆;粉煤灰;原位自生;增强颗粒;耐磨性

Abstract: Using Fe-based alloy powder,Al,TiO2 and B4 C as coated materials and high-alumina fly ash, SiO2 ,MgO,CaF2 and CeO2 as activating flux,the Fe-based composite coating reinforced by in-situ synthesized Al2O3-TiB2-TiC particulates was prepared on the surface of Q235 steel by activating argon arc cladding technology. The phase,microstructure,microhardness and wear resistance of composite coating were analyzed and compared with conventional cladding coating which didn't coat activating flux. The result shows that the phases of composite coating consists of Al2O3 ,TiB2 ,TiC,FeSi2 Ti,FeB2 andα-Fe. The interface between the coating and substrate has excellent bonding without pores and cracks. The maximum microhardness of the coating is 1283. 4 HV0. 2 . Wear test results indicate that the composite coating has excellent wear resistance in the condition of dry sliding wear at room temperature. Fly ash composite activating flux can promote better fusion of cladding coating and the substrate,increase the types and numbers of new phase and improve the efficiency of argon arc cladding,which is of great significance to improve the comprehensive properties of composite coating.

Key words: activating argon arc cladding;fly ash;in-situ synthesis;reinforced particulate;wear resistance