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Improving the corrosion resistance of thermal barrier coatings against CMAS by depositing top ceramic layer of enhanced splat bonding

  • Xi'an Jiaotong University

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

The corrosion resistance of thermal barrier coatings against CMAS deposit at high temperature is significantly affected by the microstructure of the coatings. Enhancing the bonding ratio between splats can reduce the inter-connected pores and then obstructs the penetration of the molten CMAS into the coatings. In this study, atmospheric plasma sprayed ZrO2 contains 8 wt. % Y2O3 (8YSZ) coating with improved lamellar bonding ratios was deposited with full-molten droplets at an enhanced deposition temperature. The microstructure of the dense 8YSZ coating and conventional 8YSZ coating before and after thermal exposure with CMAS were characterized. It was clearly revealed that by adjusting the microstructure and designing a ceramic layer with high bonding ratio, the corrosion resistance of the thermal barrier coating could be enhanced. Moreover, by designing double-ceramic-layer (DCL) TBCs composed of a porous ceramic layer and well- bonded ceramic layer, the TBCs with high CMAS corrosion resistance and low thermal conductivity can be achieved.

Original languageEnglish
Title of host publicationASM International - International Thermal Spray Conference and Exposition, ITSC 2015
EditorsArvind Agarwal, Yuk-Chiu Lau, Andre McDonald, Giovanni Bolelli, Filofteia-Laura Toma, Amadeu Concustell, Christian A. Widener, Erja Turunen
PublisherASM International
Pages92-98
Number of pages7
ISBN (Electronic)9781510811546
StatePublished - 2015
EventInternational Thermal Spray Conference and Exposition, ITSC 2015 - Long Beach, United States
Duration: 11 May 201514 May 2015

Publication series

NameProceedings of the International Thermal Spray Conference
Volume1

Conference

ConferenceInternational Thermal Spray Conference and Exposition, ITSC 2015
Country/TerritoryUnited States
CityLong Beach
Period11/05/1514/05/15

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