Vacuum Gas Nitriding Treatment of TC6 Titanium Alloy for Aeroengine

TC6 titanium alloy for aviation was treated by vacuum gas nitriding to improve the surface wear resistance.The microstructure, hardness and wear resistance were analyzed by X-ray diffractometer, metallographic microscope, microhardness and wear tester.The results show that the phases of nitriding layer are mainly composed of TiN and Ti₂N, and the nitrided layer of 50-70 μm is obtained after vacuum gas nitriding at 800 ℃for 8 h.The surface hardness can reach 800-830 HV, which is two times as much as that of untreated sample.The wear loss weight is only 1/12 of the untreated sample under the same conditions.The furrow is not clearly observed and the nitriding layer is basically intact.The wear resistance of nitrided TC6 titanium alloy are greatly improved.