Multilayered thermal barrier coating for land-based gas turbines |
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Authors: | M Tamura M Takahashi J Ishii K Suzuki M Sato K Shimomura |
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Affiliation: | (1) Toshiba Corporation, 2-4, Suehiro-Cho, Turumi-Ku, 230-0045 Yokahama, Japan;(2) Tohoku Electric Power Co., Inc., 981 Sendai, Japan |
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Abstract: | Multilayered thermal barrier coatings (TBC) with different functions were proposed for the hot section components of land-based
gas turbines. This article describes a multilayered TBC with an oxidation resistant layer. A conventional duplex TBC and a
triplex TBC, in which an aluminized layer was added to the conventional duplex TBC to increase oxidation resistance, were
prepared. It was confirmed by a burner rig test that the triplex TBC with the aluminized layer is resistant to oxidation and
shows high durability in a thermal cycle test, compared with the conventional duplex TBC. The spalling in the thermal cycle
test of each TBC specimen occurred at the same position, when the thickness of the oxidation layer was 11 to 13 μm. The mechanism
of spalling of the coating in the thermal cycle test was discussed in terms of stress in the coating. Stress in the direction
of spalling occurred by an uneven interface between the bond and top coat and increased with growth of the oxidation layer.
It is thought that the high durability of the triplex TBC in the thermal cycle test is derived from suppressing the growth
of the oxidation layer and decreasing the stress due to the addition of the aluminized layer. |
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Keywords: | multilayered thermal barrier coatings oxidation layer stress analysis thermal barrier coating spalling |
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