Mechanistic Understanding for Degraded Thermal Barrier Coatings
Autor: | Taiji Torigoe, Tetsuo Shoji, Hisahiko Aoki, Kazuhiro Ogawa, Norio Fujita |
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Rok vydání: | 2001 |
Předmět: |
Materials science
Mechanical Engineering Oxide Substrate (electronics) engineering.material Superalloy Thermal barrier coating chemistry.chemical_compound chemistry Coating visual_art engineering visual_art.visual_art_medium General Materials Science Ceramic Composite material Layer (electronics) Yttria-stabilized zirconia |
Zdroj: | JSME International Journal Series A. 44:507-513 |
ISSN: | 1347-5363 1344-7912 |
Popis: | A two-layer plasma sprayed thermal barrier coating on Ni base superalloy substrate was characterized. The coating was comprised of an inner layer of MCrAIY 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. |
Databáze: | OpenAIRE |
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