Delamination Behavior of Thermal Barrier Coatings under Thermo-Mechanical Fatigue

It has become common to apply thermal barrier coatings (TBC) to hot gas path parts in gas turbines to increase thermal efficiency. However, some uncertainty about the delamination life prediction method for TBC still remains. The influences of mechanical parameters on delamination behavior were inve...

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Veröffentlicht in:Journal of the Society of Materials Science, Japan Japan, 2009/09/15, Vol.58(9), pp.759-766
Hauptverfasser: YOSHITAKE, Shigeru, IIO, Tetsuji, FUNAO, Atsuki, SEKIHARA, Masaru, ARIKAWA, Hideyuki, ICHIKAWA, Kunihiro
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container_end_page 766
container_issue 9
container_start_page 759
container_title Journal of the Society of Materials Science, Japan
container_volume 58
creator YOSHITAKE, Shigeru
IIO, Tetsuji
FUNAO, Atsuki
SEKIHARA, Masaru
ARIKAWA, Hideyuki
ICHIKAWA, Kunihiro
description It has become common to apply thermal barrier coatings (TBC) to hot gas path parts in gas turbines to increase thermal efficiency. However, some uncertainty about the delamination life prediction method for TBC still remains. The influences of mechanical parameters on delamination behavior were investigated through thermo-mechanical fatigue (TMF) tests to improve TBC delamination life prediction. The parameters investigated were loading pattern, strain range, ceramic coating thickness, and high temperature exposure processing prior to TMF tests. Delamination behavior with a simulated loading pattern seemed to better correspond to behavior under out-of-phase (OP) loading than that with in-phase (IP) loading. The OP loading pattern was better for evaluating delamination lives because of its shorter test period. The delamination lives became shorter under larger strain ranges. Of the specimens tested, the specimen with a 0.9-mm-thick ceramic coating had the shortest delamination life. The specimen with a 0.6-mm-thick coating had almost the same or longer life than the specimen with a 0.3-mm-thick coating. These results strongly suggest that an optimum ceramic coating thickness keeps the cooling performance consistent with delamination strength. Thermally grown oxides (TGO) are generally thought to be the main cause of TBC degradation in long-term operated gas turbine blades. The growth behavior of TGO was observed by exposing specimens to a high-temperature environment and it was suggested that the Larson-Miller parameter (LMP) could predict TGO thickness well. In addition, some specimens were exposed to high-temperature environments prior to TMF tests to evaluate the effect of TGO thickness on delamination lives. This high temperature pre-exposure seemed to accelerate the delamination growth rate due to sintering and TGO.
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However, some uncertainty about the delamination life prediction method for TBC still remains. The influences of mechanical parameters on delamination behavior were investigated through thermo-mechanical fatigue (TMF) tests to improve TBC delamination life prediction. The parameters investigated were loading pattern, strain range, ceramic coating thickness, and high temperature exposure processing prior to TMF tests. Delamination behavior with a simulated loading pattern seemed to better correspond to behavior under out-of-phase (OP) loading than that with in-phase (IP) loading. The OP loading pattern was better for evaluating delamination lives because of its shorter test period. The delamination lives became shorter under larger strain ranges. Of the specimens tested, the specimen with a 0.9-mm-thick ceramic coating had the shortest delamination life. The specimen with a 0.6-mm-thick coating had almost the same or longer life than the specimen with a 0.3-mm-thick coating. These results strongly suggest that an optimum ceramic coating thickness keeps the cooling performance consistent with delamination strength. Thermally grown oxides (TGO) are generally thought to be the main cause of TBC degradation in long-term operated gas turbine blades. The growth behavior of TGO was observed by exposing specimens to a high-temperature environment and it was suggested that the Larson-Miller parameter (LMP) could predict TGO thickness well. In addition, some specimens were exposed to high-temperature environments prior to TMF tests to evaluate the effect of TGO thickness on delamination lives. 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Soc. Mat. Sci., Japan</addtitle><description>It has become common to apply thermal barrier coatings (TBC) to hot gas path parts in gas turbines to increase thermal efficiency. However, some uncertainty about the delamination life prediction method for TBC still remains. The influences of mechanical parameters on delamination behavior were investigated through thermo-mechanical fatigue (TMF) tests to improve TBC delamination life prediction. The parameters investigated were loading pattern, strain range, ceramic coating thickness, and high temperature exposure processing prior to TMF tests. Delamination behavior with a simulated loading pattern seemed to better correspond to behavior under out-of-phase (OP) loading than that with in-phase (IP) loading. The OP loading pattern was better for evaluating delamination lives because of its shorter test period. The delamination lives became shorter under larger strain ranges. Of the specimens tested, the specimen with a 0.9-mm-thick ceramic coating had the shortest delamination life. The specimen with a 0.6-mm-thick coating had almost the same or longer life than the specimen with a 0.3-mm-thick coating. These results strongly suggest that an optimum ceramic coating thickness keeps the cooling performance consistent with delamination strength. Thermally grown oxides (TGO) are generally thought to be the main cause of TBC degradation in long-term operated gas turbine blades. The growth behavior of TGO was observed by exposing specimens to a high-temperature environment and it was suggested that the Larson-Miller parameter (LMP) could predict TGO thickness well. In addition, some specimens were exposed to high-temperature environments prior to TMF tests to evaluate the effect of TGO thickness on delamination lives. 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Soc. Mat. Sci., Japan</addtitle><date>2009-09</date><risdate>2009</risdate><volume>58</volume><issue>9</issue><spage>759</spage><epage>766</epage><pages>759-766</pages><issn>0514-5163</issn><eissn>1880-7488</eissn><abstract>It has become common to apply thermal barrier coatings (TBC) to hot gas path parts in gas turbines to increase thermal efficiency. However, some uncertainty about the delamination life prediction method for TBC still remains. The influences of mechanical parameters on delamination behavior were investigated through thermo-mechanical fatigue (TMF) tests to improve TBC delamination life prediction. The parameters investigated were loading pattern, strain range, ceramic coating thickness, and high temperature exposure processing prior to TMF tests. Delamination behavior with a simulated loading pattern seemed to better correspond to behavior under out-of-phase (OP) loading than that with in-phase (IP) loading. The OP loading pattern was better for evaluating delamination lives because of its shorter test period. The delamination lives became shorter under larger strain ranges. Of the specimens tested, the specimen with a 0.9-mm-thick ceramic coating had the shortest delamination life. The specimen with a 0.6-mm-thick coating had almost the same or longer life than the specimen with a 0.3-mm-thick coating. These results strongly suggest that an optimum ceramic coating thickness keeps the cooling performance consistent with delamination strength. Thermally grown oxides (TGO) are generally thought to be the main cause of TBC degradation in long-term operated gas turbine blades. The growth behavior of TGO was observed by exposing specimens to a high-temperature environment and it was suggested that the Larson-Miller parameter (LMP) could predict TGO thickness well. 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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; J-STAGE (Japan Science & Technology Information Aggregator, Electronic) Freely Available Titles - Japanese
subjects Delamination
Gas turbine
Thermal barrier coatings
Thermally grown oxides
Thermo-mechanical fatigue
title Delamination Behavior of Thermal Barrier Coatings under Thermo-Mechanical Fatigue
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