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A Conformable High Temperature Nitride Coating for Ti Alloys
Acta Materialia ( IF 9.4 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.actamat.2020.02.051
Zhaohe Gao , Zhenbo Zhang , Xun Zhang , Justyna Kulczyk-Malecka , Han Liu , Peter Kelly , Philip J. Withers , Ping Xiao

Abstract There are many applications including aeroengine design where one would like to operate Ti or its alloys at higher temperatures, but the threat of oxidation or fire remains a longstanding challenge. Here, we have designed a bilayer nitride coating for Ti and its alloys produced by magnetron sputter deposition of a SiAlN coating (1.2 μm thick) along with a Mo interlayer. We have taken advantage of interdiffusion and inter-reaction at the interface during cyclic oxidation at 800 °C to form a layered nitride coating system comprising: a SiAlN top layer, a TiN0.26 and Ti5Si3 mixed phase interlayer, and a Ti-Mo solid solution. The novel TiN0.26 interlayer exhibits adaptive conformability via mechanical twinning, thereby accommodating the thermal mismatch strain between the coating and substrate. This, along with high adhesion, confers excellent thermal cycling life with no cracking, spallation and oxidation of the coating, evident after hundreds of hours of cyclic oxidation (>40 cycles) in air at 800 °C. This work provides a design pathway for a new family of coatings displaying excellent adhesion, adaptive conformability and superior environmental protection for Ti alloys at high temperature.

中文翻译:

一种用于钛合金的适形高温氮化物涂层

摘要 在包括航空发动机设计在内的许多应用中,人们希望在更高的温度下运行 Ti 或其合金,但氧化或火灾的威胁仍然是一个长期存在的挑战。在这里,我们为 Ti 及其合金设计了双层氮化物涂层,通过磁控溅射沉积 SiAlN 涂层(1.2 μm 厚)和 Mo 夹层。我们利用在 800 °C 循环氧化过程中界面的相互扩散和相互反应,形成层状氮化物涂层系统,包括:SiAlN 顶层、TiN0.26 和 Ti5Si3 混合相夹层,以及 Ti-Mo 固体解决方案。新型 TiN0.26 夹层通过机械孪晶表现出适应性一致性,从而适应涂层和基材之间的热失配应变。这与高附着力一起,具有优异的热循环寿命,涂层不会开裂、剥落和氧化,这在 800 °C 空气中经过数百小时循环氧化(> 40 次循环)后很明显。这项工作为新型涂层系列提供了一种设计途径,该系列涂层在高温下对 Ti 合金显示出优异的附着力、适应性顺应性和卓越的环境保护。
更新日期:2020-05-01
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