致密化处理对冷喷涂NiAl涂层的高温氧化行为的影响
发布时间：2018-08-07 21:44
【摘要】：通过机械合金化及冷喷涂在镍基高温合金(IN738)基体上制备Ni/Al复合涂层。在保护气氛Ar中热扩散制备NiAl金属间化合物涂层。为了研究致密化对NiAl涂层的抗氧化性能的影响,对NiAl金属间化合物涂层及经过喷丸工艺和在1080℃下10h的热处理获得的NiAl致密化涂层进行了等温氧化试验。将试样在1020℃下分别进行1h、10h和200h的氧化,采用X射线衍射仪和扫描电子显微镜分析了高温氧化后涂层的组织结构。结果表明,NiAl涂层高温氧化过程中涂层表面氧化膜剥落情况比较严重,1020℃高温氧化10h时有明显的氧化膜剥落现象,但涂层内部氧化随高温氧化的时间变化不大。致密化处理后NiAl涂层没有发生明显的氧化,并表现出了很好的抗氧化性能,在1020℃高温氧化200h后,涂层内部仍然没有发生明显的氧化。
[Abstract]:Ni/Al composite coatings were prepared on nickel base superalloy (IN738) by mechanical alloying and cold spraying. NiAl intermetallics coatings were prepared by thermal diffusion in protective atmosphere ar. In order to study the effect of densification on the oxidation resistance of NiAl coatings, the isothermal oxidation tests of NiAl intermetallic coatings and NiAl densification coatings obtained by shot peening and heat treatment at 1080 鈩，
本文编号：2171443
[Abstract]:Ni/Al composite coatings were prepared on nickel base superalloy (IN738) by mechanical alloying and cold spraying. NiAl intermetallics coatings were prepared by thermal diffusion in protective atmosphere ar. In order to study the effect of densification on the oxidation resistance of NiAl coatings, the isothermal oxidation tests of NiAl intermetallic coatings and NiAl densification coatings obtained by shot peening and heat treatment at 1080 鈩，
本文编号：2171443
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