Microstructure and wear resistance of laser clad TiC coating on TC4 titanium alloy surface

The laser clad TiC composite coating of smooth,fine microstructure,pore-free and cracks-free on TC4 alloy was gained with 5.0 kW continuous wave CO2 laser.Microstructure,composition and phase of the coating were investigated by means of SEM,EDAX,XRD,and microhardness and friction wear properties was measured by HXD-1000TMC microhardness tester,and HT-600 wear test machine,respectively.The results indicate that the laser clad TiC composite coating is well bonded with the matrix alloy.The coating has a great quantity of lump and needle shaped TiC particles and dendrite TiC.Microhardness of the coating is reached 880-1087 HV0.1,the wear resistance of TC4 titanium alloy is greatly enhanced by the coating.