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金属学报  2011, Vol. 47 Issue (6): 655-662    DOI: 10.3724/SP.J.1037.2010.00713
  论文 本期目录 | 过刊浏览 |
La和Hf对CoNiCrAl合金涂层高温氧化行为的影响
宋鹏1,2,陆建生1,张德丰1,吕建国3,李德江4
1. 昆明理工大学材料科学与工程学院, 昆明 650093
2. Forschungszentrum Juelich, IEK-2, Juelich 52425, Germany
3. 昆明理工大学应用技术学院, 昆明 650093
4. 上海交通大学材料科学与工程学院, 上海 200240
EFFECT OF La AND Hf DOPANT ON THE HIGH TEMPERATURE OXIDATION OF CoNiCrAl ALLOYS
SONG Peng 1,2, LU Jiansheng 1, ZHANG Defeng 1, L¨U Jianguo 3, LI Dejiang 4
1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093
2. Forschungszentrum Juelich, IEK–2, Juelich 52425, Germany
3. Faculty of Applied Technology, Kunming University of Science and Technology, Kunming 650093
4. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240
引用本文:

宋鹏 陆建生 张德丰 吕建国 李德江. La和Hf对CoNiCrAl合金涂层高温氧化行为的影响[J]. 金属学报, 2011, 47(6): 655-662.
, , , , . EFFECT OF La AND Hf DOPANT ON THE HIGH TEMPERATURE OXIDATION OF CoNiCrAl ALLOYS[J]. Acta Metall Sin, 2011, 47(6): 655-662.

全文: PDF(4924 KB)  
摘要: 对单一添加及同时添加La和Hf的CoNiCrAl合金进行真空高温氧化处理, 研究单一添加与同时添加La和Hf对合金表面氧化物生长机制和黏结性能的影响. 结果表明: 表面抛光的合金在1100℃氧化时, 同时添加La和Hf使CoNiCrAl合金在其表面形成了连续均匀的Al2O3, 并且具有较好的黏结性能.通过18O追踪原子氧化发现CoNiCrAlLa, CoNiCrAlHf和CoNiCrAlLaHf合金的Al2O3生长均为O2-内扩散为主的生长机制,同时伴随少量的金属离子外扩散. 单一添加La和Hf, 形成的Al2O3表面富集Cr,Co和Ni等, 且随Al2O3深度增加而逐渐降低, 这些元素促使Al2O3表面形成Ni(Co)Al2O4, 从而降低Al2O3的黏结性能. 同时添加La和Hf,没有改变O2-内扩散为主的生长机制, 但Hf能够阻碍La在氧化物/合金界面的富集,减少Ni(Co)Al2O4形成, 同时合金表面局部内氧化的钉扎效应提高了Al2O3的黏结性能.
关键词 CoNiCrAl合金 La Hf 高温氧化 生长机制    
Abstract:CoNiCrAl alloys are widely used as bond coats for thermal barrier coating (TBC) at high operating temperature for energy conversion systems, especially turbine. However, the effect of reactive element (RE) on the oxidation behavior of CoNiCrAl alloys is still not uniform, thereby limiting the usage of the alloys. To study the effect of co–doped RE, the polished cast CoNiCrAlLa, CoNiCrAlHf and CoNiCrAlLaHf alloys were oxidized at 1100 ℃ in vacuum. Growth kinetics and adherence of oxide scales formed on above alloys were studied through comparing mass dynamics curves and tracer oxidation of the alloys. SEM, TG and XRD as well as secondary neutrals mass spectrometry (SNMS) were employed to study the microstructure and growth mechanism of the oxide layers. The results showed that a protective Al2O3 scale formed on the surface of CoNiCrAlLaHf alloy, and the Al2O3 scale showed a good adherence due to a pinning effect of the internal oxidation and less Ni(Co)Al2O4 formation. The Hf could suppress La enrichment at the oxide/alloy interface for the co–doped alloy. Oxygen inwards–diffusion along the oxide, which mainly controlled oxide scale growth, was observed when these three alloys oxidized in the atmospheres including tracer 18O. Enrichment of Cr, Co and Ni occurred at the outer part of oxide scale, and then decreased to a low level within the oxide layer. These Cr, Co and Ni enrichments could promote the Ni(Co)Al2O4 formation at the top of oxide scale for the single–doped alloys, which was detrimental to Al2O3 adherence properties.
Key wordsCoNiCrAl alloy    La    Hf    high temperature oxidation    growth mechanism
收稿日期: 2010-12-31     
作者简介: 宋鹏, 男, 1979年生, 博士
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