Mining hydraulic support columns are prone to wear,corrosion,deformation and other problems during long-term service in harsh underground conditions,which can lead to performance degradation and,in severe cases,safety accidents.To extend the service life of hydraulic support columns,a Ni-based Ti2AlC ceramic coating is prepared on the surface of 27SiMn steel using ultra high speed laser cladding technology.The microstructure,phase,and microhardness of the coating are characterized,and its friction and wear properties are studied.The experimental results show that the coating prepared has a strong metallurgical bonding strength with the substrate,and the coating is dense.The upper part of the coating is mainly composed of black cell dendrites,gray white cell crystals,and light gray continuous matrix.The phases of the coating are hard TiC and Al2O3,lubri-cating Ti2AlC,trace Ti3AlC2,intermetallic compounds Ni3Ti,Ni3Al,and γ-Ni solid solution is the main component.The average microhardness of the coating is 549.5HV0.2,the average microhard-ness of the coating is about three times that of the substrate,and the friction and wear performance significantly improves compared to the substrate.
hydraulic support columnlaser melting coatingNi-Ti2AlC ceramic coatingfriction and wear
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