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Title :熱サイクル疲労後の遮熱コーティングの残存密着強度に及ぼすボンドコート界面粗さの影響(<小特集>ガスタービン用遮熱/耐環境コーティング技術)
Title alternative :Effect of Interfacial Roughness of Bond Coat on the Residual Adhesion Strength of a Plasma Sprayed TBC System after Thermal Cycle Fatigue(<Special Issue>Thermal Barrier Coating Systems for Gas Turbines)
Authors :山崎, 泰広
深沼, 博隆
大野, 直行
Publisher :社団法人日本機械学会
Issue Date :Jul-2010
Journal Title :日本機械学會論文集 A編
Volume :76
Issue :767
Start Page :831
End Page :838
ISSN :0387-5008
Abstract :The effect of the bond coat on residual adhesion strength after thermal cycle fatigue was investigated in plasma-sprayed thermal barrier coatings (TBC). This study used CoNiCrAlY powder with two different particle sizes for spraying bond coat material to examine the effect of interface roughness between the bond coat and top coat. In addition, the bond coat was sprayed on either by a high velocity oxy-fuel (HVOF) or a low pressure plasma spray (LPPS). The residual adhesion strength of the TBC top coat was evaluated as a function of the number of thermal cycles by the modified 4-point bending test. In addition, SEM observations of thermal fatigue cracking morphologies and measurements of the residual stress in the ceramic top coat were carried out. The experimental results indicated that, after thermal cycle fatigue, microcracks were generated in the ceramic top coat; however, they were moderated in a rough interface TBC compared to a smooth interface TBC. In addition, the bond coat sprayed by the HVOF method showed a higher resistance to microcracking than the coat sprayed using the LPPS. Residual stress in the ceramic top coat is almost zero at 0 thermal cycles. After thermal cycle fatigue, it becomes compression; however, it is independent of the bond coat. There was little difference in the adhesion strength by bond coat in as-sprayed conditions. On the other hand, the specimen with a rough interface exhibited higher residual adhesion strength after thermal cycle fatigue compared with the specimens with a relatively smooth interface. In addition, if the bond coat is sprayed by HVOF, the residual adhesion strength increases. It was revealed that the difference in residual adhesion strength by bond coat is related to the distribution morphology of thermal fatigue microcracks.
Keywords :Thermal Barrier Coatings
Interface Strength
Thermal Cycle Fatigue
Interfacial Roughness
Bond Coat
Low Pressure Plasma Spray
High Velocity Oxy-Fuel
Type Local :Journal Article
Language :jpn
URI :http://hdl.handle.net/10623/28498
Relation :http://ci.nii.ac.jp/naid/110007685182
Rights :社団法人日本機械学会
Appears in Collections:10 査読済論文 = Postprint

Please use this identifier to cite or link to this item: http://hdl.handle.net/10623/28498

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