Impurity Segregation at TGO/Bondcoat Interfaces and Its Effect on TGO Adherence

中国腐蚀与防护学报

2009, Vol. 29

Issue (4): 277-285

本期目录 | 过刊浏览

Impurity Segregation at TGO/Bondcoat Interfaces and Its Effect on TGO Adherence

P. Y. HOU

Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley; CA 94720; USA

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摘要:

Impurity segregation at the interfaces between thermally grown aluminum oxide and a few coatings deposited on single crystal Ni-based superalloys are reviewed. Results are compared with studies made at oxide/metal interfaces formed on model Al₂O₃-forming alloys. The coatings were NiPtAl on CMSX4 or AM1 with two different bulk sulfur contents, and NiCoCrAlY on PWA1484. Auger electron microscopy was used to study the chemistry at the TGO/coating interface after portions of the oxide scale were removed in ultra high vacuum by scratching the oxidized sample. The extent of oxide spallation in relation to the scratch width was utilized to evaluate the interfacial strength, which was then related to the interface chemistry, particular its sulfur level. Results show strong relationship between sulfur segregation and the alloy substrate composition. This relationship is discussed in terms of the effects of Pt, Hf, Y and Cr and the alloy sulfur content.

关键词 ： sulfur, phosphorus, oxidation, adhesion, reactive element, platinum

收稿日期: 2009-06-10

通讯作者: P. Y. Hou E-mail: PYHou@lbl.gov

作者简介: P. Y. HOU

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引用本文:

P. Y. HOU. Impurity Segregation at TGO/Bondcoat Interfaces and Its Effect on TGO Adherence[J]. 中国腐蚀与防护学报, 2009, 29(4): 277-285.

链接本文:

https://www.jcscp.org/CN/Y2009/V29/I4/277

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