Development of Evaluation Method for Damage of Oxidation CoNiCrAlY Coating

The bond coat plays an important role in the failure of the thermal barrier coating (TBC) system used for gas turbines [1, 2]. In this research, the CoNiCrAlY coated Ni-base superalloy specimens were used for developing evaluation method for interfacial damage in the coat. Samples were exposed at 10...

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Bibliographic Details
Published in:Key engineering materials 2019-05, Vol.804, p.47-51
Main Authors: Zhu, Shijie, Chen, Mo, Yoshikawa, Kodai, Song, Zhen Qiang
Format: Article
Language:English
Subjects:
Damage assessment
Gas turbines
Low pressure
Morphology
Nickel base alloys
Optical microscopes
Oxidation
Residual stress
Spraying
Superalloys
Thermal barrier coatings
Yttrium
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Summary:The bond coat plays an important role in the failure of the thermal barrier coating (TBC) system used for gas turbines [1, 2]. In this research, the CoNiCrAlY coated Ni-base superalloy specimens were used for developing evaluation method for interfacial damage in the coat. Samples were exposed at 1000°C and 1100°C for up to 1000 hours. The morphology and residual stress in the thermally grown oxide (TGO) layer on the CoNiCrAlY coating were characterized by microscopic observation and luminescence spectroscope, respectively. The microstructure and damage o\n both the coating surfaces and the cross sections were observed by optical microscope and scanning electron microscope. According to the results, the low pressure plasma sprayed CoNiCrAlY coating (LPPS) showed the thinnest TGO layer and lowest residual stress.Residual stress decreased with an increase in exposure time, depending on the morphology of TGO layer. The effects of thermal spraying methods on the oxidation of yttrium in TGO layer and BC layer and its influence on interfacial damage were discussed.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.804.47