Mechanistic Understanding for Degraded Thermal Barrier Coatings
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- OGAWA Kazuhiro
- Fracture Research Institute, Graduate School of Engineering, Tohoku University
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- SHOJI Tetsuo
- Fracture Research Institute, Graduate School of Engineering, Tohoku University
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- AOKI Hisahiko
- Tohoku Electric Power Co., Inc.
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- FUJITA Norio
- Tohoku Electric Power Co., Inc.
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- TORIGOE Taiji
- Mitsubishi Heavy Industries, Ltd.
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A two-layer plasma sprayed thermal barrier coating on Ni base superalloy substrate was characterized. The coating was comprised of an inner layer of MCrAlY bond coating and an outer layer of 8 wt% yttria stabilized zirconia (YSZ) thermal barrier coating (TBC). After aging, the thermally grown oxide (TGO) layer at interface between YSZ and MCrAlY was observed. The TGO layer had two different contrast layers in the SEM images. The black one was closer to MCrAlY and the gray one was closer to YSZ. The thickness of both layers increased with aging. Countless porosities at the gray layer and microcrack at YSZ were also observed. Most of the macrocrack grew through the porosities. From this point of view one may say that the mechanism of macrocrack formation is a deterioration of adhesion accompanied by an increase of number of the porosities or the microcrack.
収録刊行物
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- JSME International Journal Series A Solid Mechanics and Material Engineering
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JSME International Journal Series A Solid Mechanics and Material Engineering 44 (4), 507-513, 2001
一般社団法人 日本機械学会
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詳細情報
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- CRID
- 1390282681470920064
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- NII論文ID
- 110002974740
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- NII書誌ID
- AA11179396
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- ISSN
- 13475363
- 13447912
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- NDL書誌ID
- 5944110
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可