航空用TC6钛合金真空气体渗氮处理

Vacuum Gas Nitriding Treatment of TC6 Titanium Alloy for Aeroengine

摘要: 为了提高其表面耐磨性，对航空用TC6钛合金进行了真空气体渗氮处理。采用X射线衍射仪、金相显微镜、显微硬度计和磨损试验机对真空渗氮层的组织、硬度和耐磨性能进行了研究。结果表明，航空TC6钛合金经800℃真空气体渗氮8 h后，表面获得了50～70 μm的渗氮层，渗氮层物相主要有TiN及Ti₂N组成，表面硬度为800～830 HV，与未渗氮的TC6钛合金相比，硬度提高了2倍以上，在相同的条件下进行磨损试验，渗氮试样的磨损损失质量为未渗氮试样的1/12，表面未出现明显的犁沟，渗氮层基本保持完整，耐磨性得到了极大地改善。

Abstract: 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.