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利用辉光等离子渗碳技术对Ti-6Al-4V进行了表面强化处理。等离子气体为氩气,渗碳温度和时间分别为950 ℃和3 h,工作压力为30~35 Pa。为了避免传统气体渗碳过程中易于产生氢脆的现象,用固体石墨棒作为碳源。渗碳结束后,分别利用OM、FESEM和XRD对渗碳层做分析,并在坏-块摩擦磨损试验机上对处理和未处理样品进行摩擦磨损对比实验。结果发现,渗碳层深度约为416 μm,其表面碳化物(TiC和V8C7)提高了合金表面的硬度和耐磨性能。
Ti-6Al-4V was surface strengthened by glow plasma carburization. Plasma gas is argon, carburizing temperature and time are 950 ℃ and 3 h, working pressure is 30 ~ 35 Pa. In order to avoid easy to produce hydrogen embrittlement in the process of carburizing traditional gases, solid graphite rods are used as the carbon source. After carburizing, the carburized layer was analyzed by OM, FESEM and XRD, respectively. The friction and wear comparison of treated and untreated samples was carried out on a bad-block friction and wear tester. The results show that the depth of carburized layer is about 416 μm and the surface carbides (TiC and V8C7) improve the hardness and wear resistance of the alloy surface.