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应用科学学报 ›› 1999, Vol. 17 ›› Issue (1): 119-121.

• 论文 • 上一篇    下一篇

微晶Fe3Al高温氧化动力学研究

王永刚1, 何业东2, 朱日彰2   

  1. 1. 中国民航学院;
    2. 北京科技大学
  • 收稿日期:1997-06-21 修回日期:1997-10-12 出版日期:1999-03-31 发布日期:1999-03-31
  • 基金资助:
    国家自然科学基金,中国有色金属总公司博士后科学基金及冶金部腐蚀磨蚀与表面科学开放实验室资助项目

Oxidation Kinetics of Microcrystalline Fe3Al

WANG YONGGANG1, HE YEDONG2, ZHU RIZHANG2   

  1. 1. Civil Aviation Institute of China, Tianjin 300300;
    2. University of Science and Technology Beijing, Beijing 100083
  • Received:1997-06-21 Revised:1997-10-12 Online:1999-03-31 Published:1999-03-31

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摘要： 研究了微晶化对Fe3Al在1000℃空气中氧化动力学的影响.发现微晶化后Fe3Al的氧化动力学与经典的抛物线规律存在明显的负偏差.分析认为,微晶化后氧化物形核率极大提高,氧化膜呈微晶态,氧化膜中的扩散由晶格扩散为主变为以晶界短路扩散为主,从而改变了氧化膜的生长动力学.根据Wagner高温氧化的基本理论,对微晶合金高温氧化动力学规律进行了探讨,导出其遵守四次方规律:x4=kpt.

关键词: 微晶, 动力学, 氧化, Fe3Al

Abstract: The oxidation Kinetics of microcrystalline Fe3Al was compared with that of normal grain Fe3Al at 1000℃ in air. It was shown that the oxidation rate of microcrystalline Fe3Al was heavily decreased. The oxidation kinetics of microcrystalline Fe3Al failed to obey the parabolic law. It was suggested that the oxide scale turned into microcrystalline state since the nuclear probability of oxide was extremely increased. The short circuit diffusion through oxide scale was dominant. An expression, x4=kpt, has been derived for the oxidation kinetics of microcrystalline Fe3Al based upon the model of short circuit diffusion.

Key words: oxidation, kinetics, Fe3Al, microcrystalline