Abstract

In this paper, we obtain cermet coatings with a thickness of 19 to 22 μm by the method of electrospark treatment of titanium alloy Ti6Al4V in a mixture of titanium granules with hafnium carbide powder. An increase in the volume fraction of hafnium carbide powder in the mixture of granules from 2.4 to 6.7 vol % led to an increase in the concentration of the hafnium carbide phase HfC in the coatings. The coating structure is represented by a metallic Ti–Hf–C binder with large inclusions of hafnium carbide. The average microhardness of Ti–HfC coatings was in the range of 7.1–8.3 GPa, which is 2–2.5 times higher than that of the Ti6Al4V alloy. Wear tests in dry sliding mode showed that Ti–HfC coatings had a wear rate in the range from 3.18 × 10^–6 to 1.5 × 10^–5 mm³/(N m), which is 25 to 250 times higher than that of Ti6Al4V titanium alloy.

中文翻译：

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电火花碳化Ha涂层改善Ti6Al4V合金的耐磨性

摘要

在本文中，我们通过电火花处理钛颗粒与碳化ha粉末的混合物中的钛合金Ti6Al4V，获得了厚度为19至22μm的金属陶瓷涂层。颗粒混合物中碳化ha粉末的体积分数从2.4体积％增加到6.7体积％，导致涂层中碳化ha相HfC的浓度增加。涂层结构以金属Ti-Hf-C粘合剂为代表，其中含有大量的碳化ha。Ti-HfC涂层的平均显微硬度在7.1-8.3 GPa的范围内，是Ti6Al4V合金的2-2.5倍。在干式滑动模式下的磨损测试表明，Ti–HfC涂层的磨损率范围为3.18×10 ^–6至1.5×10 ^–5 mm ³/（N m），比Ti6Al4V钛合金高25-250倍。