| TC11 is a kind ofα-βtitanium alloy with good comprehensive performance. It possess excellent heat resistance below 500℃. This alloy also has good hot working process properties (including conventional technical property and superplasticity), can be weled and hot worked by a variety of ways. TC11 titanium alloy is mainly used for manufacturing of aero-engine compressor disk, blades, drums and other parts, it is also used in the manufacture of aircraft structural parts. Howerver, poor wear resistance and oxidation resistance limits its widely application.To solve these problems, Ti-Zr modification layer was formed on the TC11 surface by using the double glow plasma surface alloying technique. The microstructure, composition and phase structure of the surface modified layers were analyzed. Through systematical experiments and verification, the optimum process parameters of plasma Zr on TC11 were got as follows: processing temperature: 900℃-950℃, diffusing time: 2h, distance between source cathode and work-piece: 20mm, working pressure: 27Pa, source voltage: 850-950V, cathode voltage: 350-450V. The Zr composition in modified layers is gradually distributed from the surface to substrate. XRD analysis show that Ti-Zr solid solution is the major phases in Zr modified layer. Wear tests indicate that the friction coefficient, wear volume and specific wear rate of Zr alloyed layer is less than TC11 under different temperature condition, these results suggest that Zr surface alloying increase wear resistance of TC11 titanium alloy. High temperature oxidation tests indicate that oxidation resistance of TC11 titanium alloy after plasma zirconnizing is improved in air at 650℃and 750℃.
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