Microstructure and Properties of Plasma-Sprayed Al_2O_3-13%TiO_2 Coating on the Surface of Extrusion Wheel

The microstructure and high temperature wear resistance of plasma sprayed Al2 O3-13%TiO2 coating on the surface of extrusion wheel.The microstructure,morphology and phase composition were analyzed by XRD,SEM and EDS,and microhardness of substrate and AT13 coating were tested by Vickers Microindentor,and the wear resistance of Al2 O3-13% TiO2 coating was evaluated by friction and wear testing machine.The results indicate that the Al2 O3-13%TiO2 coating contains γ-Al2 O3 and α-Al2 O3, mainly consists ofγ-Al2 O3,with white particles Al2 O3 on its surface,as well as better density of the coating,the surface hardness was 975HV,the wear resistance of Al2 O3-13% TiO2 coating was better than H13 which contributed to the improvement of the serviceable life of the extrusion wheel.