Mechanistic understanding for degraded thermal barrier coatings

Kazuhiro Ogawa; Tetsuo Shoji; Hisahiko Aoki; Norio Fujita; Taiji Torigoe

doi:10.1299/jsmea.44.507

Mechanistic understanding for degraded thermal barrier coatings

Kazuhiro Ogawa, Tetsuo Shoji, Hisahiko Aoki, Norio Fujita, Taiji Torigoe

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

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 MCrAIY was observed. The TGO layer had two different contrast layers in the SEM images. The black one was closer to MCrAIY 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.

Original language	English
Pages (from-to)	507-513
Number of pages	7
Journal	JSME International Journal, Series A: Solid Mechanics and Material Engineering
Volume	44
Issue number	4
DOIs	https://doi.org/10.1299/jsmea.44.507
Publication status	Published - 2001 Oct

Keywords

Ceramics
Crack propagation
Laminated construction
Thermal
Thermal stress

ASJC Scopus subject areas

Materials Science(all)
Mechanical Engineering

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title = "Mechanistic understanding for degraded thermal barrier coatings",

abstract = "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 MCrAIY was observed. The TGO layer had two different contrast layers in the SEM images. The black one was closer to MCrAIY 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.",

keywords = "Ceramics, Crack propagation, Laminated construction, Thermal, Thermal stress",

author = "Kazuhiro Ogawa and Tetsuo Shoji and Hisahiko Aoki and Norio Fujita and Taiji Torigoe",

year = "2001",

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AU - Ogawa, Kazuhiro

AU - Shoji, Tetsuo

AU - Aoki, Hisahiko

AU - Fujita, Norio

AU - Torigoe, Taiji

PY - 2001/10

Y1 - 2001/10

N2 - 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 MCrAIY was observed. The TGO layer had two different contrast layers in the SEM images. The black one was closer to MCrAIY 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.

AB - 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 MCrAIY was observed. The TGO layer had two different contrast layers in the SEM images. The black one was closer to MCrAIY 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.

KW - Ceramics

KW - Crack propagation

KW - Laminated construction

KW - Thermal

KW - Thermal stress

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