魏文庆,姜军生,陆述田,崔大伟,魏尊杰,张鹏

• 1:潍坊学院机电与车辆工程学院
• 2:哈尔滨工业大学材料科学与工程学院

摘要(Abstract)：

利用真空非自耗电弧炉制备不同Al含量的Nb-25Ti-8C合金,研究Nb-Ti-Al-C合金的组织结构及其高温氧化行为。研究表明,Nb-25Ti-8C-(0,5,10)Al合金由Nbss和(Nb,Ti)C两相构成;Nb-25Ti-8C-15Al合金由Nbss、(Nb,Ti)C和Nb3Al三相构成。800~1000℃氧化过程中,合金氧化膜为由Nb2O5,Ti O2,Al2O3,Nb O2及Ti Nb2O7多种氧化物构成的混合氧化膜。Ti、Al活性元素可优先与氧发生选择性氧化,抑制氧化物Nb2O5生成,提高氧化膜致密度和合金抗氧化性,并且氧化温度越高,Al元素改善铌合金抗氧化性能效果越明显。Nb-25Ti-8C合金800℃氧化时表现出良好的抗氧化性能,1000℃氧化时Nb-25Ti-8C-x Al合金的抗氧化性能明显优于C-103。随氧化温度升高,氧化膜中Nb2O5含量增加,导致氧化膜与合金基体的内应力增大,引起外层氧化膜脱落。碳化物中C元素以CO2形式挥发导致氧化层表面形成氧化空洞。

关键词(KeyWords)： Nb-Ti-Al-C合金;组织结构;高温氧化行为

Abstract:

Keywords:

基金项目(Foundation): 山东省科技发展计划(攻关)资助(2011GGX10226)

作者(Author): 魏文庆,姜军生,陆述田,崔大伟,魏尊杰,张鹏

DOI: 10.13289/j.issn.1009-6264.2015.05.011

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