铝硅氮化硼封严涂层热稳定性及可磨耗性能评价研究

摘要

AlSi-hBN coating was prepared on the surface of Ti-6Al-4V alloy by plasma spraying. Static isothermal oxidation tests for the coating specimens were performed at 450℃. The variations of hardness and microstructure of the coating with dwelling time were analyzed, and its abradability and wear behaviors with the mate of titanium alloy blade was evaluated and researched, as well as the wear mechanisms serving at high temperature were discussed. The results indicate that the hardness increased with the extension of heat preservation time decreases first, 400h after stabilizing. Wear mainly are cutting and grooving, and wear performance is good.%采用大气等离子喷涂技术在Ti-6Al-4V合金表面制备了铝硅氮化硼(AlSi/hBN)封严涂层，对涂层试样进行了静态空气下450℃的恒温氧化试验，分析了涂层的硬度、组织结构随保温时间的变化，并对不同保温时间后涂层与钛合金叶片的对磨刮削可磨耗性进行了评价和分析研究，初步探讨了涂层在高温下长时间服役后的磨耗机制。结果表明，AlSi/hBN涂层在450℃下硬度、结合强度随保温时间延长先减小后增加，至500h后趋于稳定；磨耗机制以切削、犁沟为主，涂层可磨耗性能良好。