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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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NiCrAlY/Al--Al2O3/Ti2AlNb高温抗氧化和力学性能研究
DOI: 10.3724/SP.J.1037.2012.00087, PP. 579-586
Keywords: 涂层,扩散阻挡层,氧化,互扩散,O相Ti2AlNb合金
Abstract:
采用电弧离子镀技术在NiCrAlY涂层与O相Ti2AlNb合金之间沉积不同Al∶Al2O3比例的Al--Al2O3薄膜作为扩散阻挡层.研究了900℃下恒温氧化500h后NiCrAlY/Al--Al2O3/Ti2AlNb体系中Al--Al2O3层阻挡合金元素互扩散的行为,以及对涂层氧化动力学曲线的影响.结果表明,没有添加扩散阻挡层的NiCrAlY/Ti2AlNb体系,涂层和基体之间的元素互扩散十分严重,涂层丧失抗氧化能力；而添加扩散阻挡层的材料体系,涂层和基体之间的元素互扩散受到抑制,涂层的长期抗高温氧化性能得到提高.对于3Al--Al2O3,1Al--Al2O3和0Al--Al2O3~3种扩散阻挡层,综合比较材料体系的抗氧化性能、阻挡层阻挡涂层和基体元素互扩散能力、以及涂层和基体之间结合力,当1Al--Al2O3薄膜作为扩散阻挡层时,材料性能最优异.同时,本文利用扩散阻挡系数简洁定量地表示出不同Al∶Al2O3比例阻挡层的阻挡扩散能力.
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