吴向清,杨志成,谢发勤,田进

• 1:西北工业大学航空学院

摘要(Abstract)：

利用多弧离子镀技术在TiAl合金表面制备纯铝层,分别进行720℃×2 h、780℃×2 h和840℃×2 h高温扩散处理,采用SEM、EDS和XRD分析了扩散铝层的微观组织及其相组成,并测试了不同扩散热处理工艺对合金高温氧化性能的影响。结果表明:随着扩散温度升高,镀铝扩散层厚度不断增加,扩散层由表及里形成Al2O3/TiAl3/TiAl2的结构特征,且内部Al元素浓度呈梯度分布;镀铝经扩散处理后的TiAl合金在850℃空气中的氧化速度主要受扩散层元素与基体元素之间的热扩散过程控制。氧化动力学曲线呈对数变化规律。当扩散工艺为840℃×2 h时,镀铝扩散层具有优良的抗高温氧化性能。

关键词(KeyWords)： TiAl合金;多弧离子镀铝;扩散处理;高温氧化

Abstract:

Keywords:

基金项目(Foundation): 国家基础研究发展计划项目(2007CB607603);; 陕西省科学技术研究发展计划项目(2006KG03)

作者(Author): 吴向清,杨志成,谢发勤,田进

DOI: 10.13289/j.issn.1009-6264.2013.06.024

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