任蓓蕾,缪强,梁文萍,王力,胡荣耀,陆海峰

• 1:南京航空航天大学材料科学与技术学院

摘要(Abstract)：

利用双辉等离子表面冶金技术在Ti_2AlNb合金表面制备渗铝层,借助SEM,EDS和XRD研究了3种工艺温度下(720,780和840℃)渗铝层的微观组织及其相组成,并测试了渗铝温度对Ti_2AlNb合金高温氧化性能的影响。结果表明:等离子渗铝层由沉积层和扩散层组成,随着渗铝温度的升高,扩散层厚度不断增加,且内部Al、Ti和Nb元素浓度呈梯度分布。经渗铝处理后的Ti_2AlNb合金在850℃空气中的氧化速度主要受扩散层Al元素与基体Ti、Nb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。在840℃制备的渗铝层具有最佳的抗高温氧化性能。

关键词(KeyWords)： Ti2AlNb合金;双辉等离子表面冶金;渗铝;高温氧化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51174119);; 南京航空航天大学博士学位论文创新与创优基金(BCXJ14-11);; 江苏高校优势学科建设工程资助项目

作者(Author): 任蓓蕾,缪强,梁文萍,王力,胡荣耀,陆海峰

DOI: 10.13289/j.issn.1009-6264.2015.12.041

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