高等学校化学学报

高等学校化学学报

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镍基铸造高温合金K52在900 ℃恒温氧化性能的研究

李云1,2,3, 徐宁1, 郭建亭2, 袁超2, 杨洪才3   

    1. 沈阳化工学院应用化学学院, 沈阳 110142;
    2. 中国科学院金属研究所, 沈阳 110016;
    3. 东北大学材料与冶金学院, 沈阳 110014
  • 收稿日期:2006-04-03 修回日期:1900-01-01 出版日期:2007-01-10 发布日期:2007-01-10
  • 通讯作者: 李云

Constant Temperature Oxidation Behavior of a High-temperature-cast Ni-base Superalloy K52 at 900 ℃

LI Yun1,2,3, XU Ning1, GUO Jian-Ting2, YUAN Chao2, YANG Hong-Cai3   

    1. Colledge of Applied Chemistry, Shenyang Institute of Chemical Technology, Shenyang 110021, China;
    2. Institute of Metal Research, Chinese Academy Sciences, Shenyang 110016, China;
    3. School of Materials & Metallurgy Northeastern University, Shenyang110014, China
  • Received:2006-04-03 Revised:1900-01-01 Online:2007-01-10 Published:2007-01-10
  • Contact: LI Yun

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被引次数

29

摘要： 研究了镍基铸造高温合金K52在900 ℃和100 h下的氧化行为, 并与ЧC104-Bи合金进行了比较, 为K52合金的设计提供了实验基础与理论依据. 结果表明, 两种合金在900 ℃和100 h下的氧化动力学曲线均符合抛物线规律, 属于完全抗氧化级. X射线衍射、扫描电镜、电子探针元素面分布和能谱分析等实验表明, K52合金和ЧC104-Bи合金的氧化膜相似, 可分为三层: 外层以TiO2层为主, 性质疏松, 空隙较多, 没有形成连续氧化层; 中间层为连续、致密、平直的氧化物, 形成保护性氧化层, 以Cr2O3为主, 并含有少量尖晶石NiCr2O4及TiO2; 内层以Al2O3为主, 含有少量TiO2氧化物. K52合金的恒温抗氧化性能优于ЧC104-Bи合金.

关键词: K52镍基铸造高温合金, 高温氧化, 氧化动力学, 氧化膜

Abstract: The isothermal oxidation behavior of a cast Ni-base superalloy K52 at 900 ℃, which compared with Ni-base superalloy ЧC104-Bи, was investigated. The bases of the experiment and theory were provided for designing and applying superalloy K52. The results indicate that oxidation kinetics obeyed parabolic law for the two kinds of superalloys. The resistance oxidation belongs to Ⅰgrade for K52 and ЧC104-Bи superalloys at 900 ℃.The scales on the surface were determined by X-ray diffraction, scanning electron microscopy(SEM), and EPMA equipped with an EDAX unit. The results show that oxidation scales of K52 superalloy is similar to that of ЧC104-Bи one, and the oxidation scales consisted of three parts: which the external layer without protective discrete is mainly formed with TiO2, and a protective continuous compact Cr2O3 layer with a certain amount of NiCr2O4 is intermediate layer, as well as the internal layer is mainly Al2O3 with a small amount of TiO2. The oxidation resistance of the superalloy K52 is superior to that of the superalloy ЧC104-Bи.

Key words: Cast Ni-base superalloy K52, High temperature oxidation, Oxidation kinetics, Oxidation film

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