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中国腐蚀与防护学报  2016, Vol. 36 Issue (5): 489-496    DOI: 10.11902/1005.4537.2016.129
  本期目录 | 过刊浏览 |
稀土 (Y,La,Ce) 复合添加对Ni-10Cr-5Al合金在1000 ℃下高温氧化行为的影响
黄嘉鹏1,杨斌2,汪航2()
1. 江西理工大学材料科学与工程学院 赣州 341000
2. 江西理工大学工程研究院 赣州 341000
Effect of Multiple Addition of Y, La and Ce on Oxidation Behavior of Ni-10Cr-5Al Alloy at 1000 ℃ in Air
Jiapeng HUANG1,Bin YANG2,Hang WANG2()
1. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2. Institute of Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
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摘要: 

通过真空感应熔炼以单一和复合两种方式在Ni-10Cr-5Al合金中添加1% (质量分数) 的稀土Y,La,Ce,Y+La,Y+Ce以及La+Ce。研究了不同稀土元素添加类型对Ni-10Cr-5Al合金在1000 ℃下空气中氧化行为的影响。采用热重法并结合X射线衍射、扫描电子显微镜、能谱仪等分析手段,检测了合金氧化后的微观结构演变和元素分布,进而探讨了不同稀土添加类型的影响作用。结果表明:经1000 ℃氧化200 h后,不同合金的稳态氧化过程均服从抛物线规律;合金添加稀土后,虽然只有单一添加Y对合金的抗氧化性能有所提高,而其他添加方式均增大了合金的氧化速率,其中复合添加的方式加剧了合金沿晶界的内氧化,但添加稀土可以抑制θ-Al2O3α-Al2O3的转变,有利于提高合金氧化膜的抗剥落性能。

关键词 NiCrAl合金稀土元素活性元素效应高温氧化    
Abstract

Ni-10Cr-5Al alloys with addition of 1%(mass fraction) of Y, La, Ce, Y+La, Y+Ce and La+Ce respectively, were prepared by vacuum induction melting. Then their oxidation behavior in air at 1000 ℃ was studied by means of thermogravimetric analysis, X-ray diffraction and scanning electron microscope with energy dispersive spectroscope. The results indicated that the oxidation kinetics of the alloys with addition of different rare earth elements at 1000 ℃ obeyed the parabolic law; however only the single addition of Y could decrease the oxidation rate of Ni-10Cr-5Al alloy, but the addition of all others increased the oxidation rate of the alloys. The multiple additions of rare earth elements could promote the internal oxidation of the alloys along grain boundaries. Besides, the transformation of θ-Al2O3 to α-Al2O3 of the formed oxide scales is suppressed in alloys containing rare earths, which will beneficial to improve the adhesion of the oxide scale.

Key wordsNiCrAl alloy    rare earth element    reactive element effect    high temperature oxidation
    
基金资助:国家自然科学基金项目 (51401095),江西省科技厅留学归国人员扶助计划项目 (20161BBH80030)和江西理工大学博士启动基金项目 (jxxjbs15001) 资助

引用本文:

黄嘉鹏,杨斌,汪航. 稀土 (Y,La,Ce) 复合添加对Ni-10Cr-5Al合金在1000 ℃下高温氧化行为的影响[J]. 中国腐蚀与防护学报, 2016, 36(5): 489-496.
Jiapeng HUANG, Bin YANG, Hang WANG. Effect of Multiple Addition of Y, La and Ce on Oxidation Behavior of Ni-10Cr-5Al Alloy at 1000 ℃ in Air. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 489-496.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.129      或      https://www.jcscp.org/CN/Y2016/V36/I5/489

图1  添加不同稀土元素的Ni-10Cr-5Al合金在1000 ℃下空气中氧化200 h的动力学曲线
Alloy sample kp1 (Linear law) / mg(cm2h)-1 kp2 (Parabolic law) / mg2(cm4h)-1
NiCrAl (N0) 0.116 0.018
NiCrAl+Y (N1) 0.049 0.001
NiCrAl+La (N2) 0.155 0.050
NiCrAl+Ce (N3) 0.320 0.049
NiCrAl+(Y+La) (N4) 0.271 0.093
NiCrAl+(Y+Ce) (N5) 0.783 1.782
NiCrAl+(La+Ce) (N6) 1.294 0.328
表1  合金试样的氧化速率常数kp
图2  添加不同稀土元素的Ni-10Cr-5Al合金氧化增重的平方与时间的关系曲线
图3  添加不同稀土元素的试样在1000 ℃下氧化200 h后表面的XRD谱
图4  添加不同稀土元素的合金试样在1000 ℃下氧化200 h后的表面形貌
Alloy sample Phase constitutions of the oxidescale
NiCrAl (N0) NiO,α-Al2O3,NiAl2O4,NiCr2O4
NiCrAl+Y (N1) NiO,α-Al2O3,θ-Al2O3,NiAl2O4,NiCr2O4,Ni3Al
NiCrAl+La (N2) NiO,α-Al2O3,θ-Al2O3,NiAl2O4
NiCrAl+Ce (N3) NiO,α-Al2O3,θ-Al2O3,NiAl2O4,CeO2,Ni3Al
NiCrAl+(Y+La) (N4) NiO,α-Al2O3,θ-Al2O3,NiAl2O4
NiCrAl+(Y+Ce) (N5) NiO,α-Al2O3,θ-Al2O3,NiAl2O4,CeO2
NiCrAl+(La+Ce) (N6) NiO,α-Al2O3,θ-Al2O3,NiAl2O4,CeO2,Ni3Al
表2  添加不同稀土元素的试样在1000 ℃氧化200 h后表面的相组成
图5  添加不同稀土元素的合金试样在1000 ℃下空气中氧化200 h后截面的SEM像
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