Preparation of W-Mo Co-penetrated Layer on Ti6Al4V Titanium Alloy Surface by Double Glow Discharge Technique and Its High Temperature Friction and Wear Properties

W-Mo co-penetrated layer was prepared on Ti6Al4V titanium alloy surface by double glow discharge technique.The structure and high temperature friction and wear properties of the co-penetrated layer were investigated.The results show that the W-Mo co-penetrated layer combined well with the substrated could be formed on the Ti6Al4V alloy surface.The layer was composed of deposited layer,transition layer and diffused layer.The microstructure of the layer was W,Mo phase and TixW1-x,MoTi solution in titanium alloy.The friction coefficient of the layer reduced a little at 450℃,but the wear resistance improved greatly.After wear,the wear scars of the surface minished significantly,and the adhesion and scratch were also reduced obviously.The wear mechanisms were adhesive wear with little micro-cutting.