Thermal fatigue characteristics of 8Y2O3-ZrO2, La2Zr2O7, La2(Zr0.7Ce0.3)2O7 and La2Ce2O7 thermal barrier coatings in duplex, multilayer functionally graded and multilayer configurations
- Title
- Thermal fatigue characteristics of 8Y2O3-ZrO2, La2Zr2O7, La2(Zr0.7Ce0.3)2O7 and La2Ce2O7 thermal barrier coatings in duplex, multilayer functionally graded and multilayer configurations
- Creator
- Pasupuleti K.T.; Vattappara K.; Gomes S.A.; Ramaswamy P.
- Description
- La2Zr2O7, La2(Zr0.7Ce0.3)2O7 and La2Ce2O7 pyrochlore plasma sprayable powders were synthesized and plasma spray coated on steel plates with NiCrAlY bond coat. Three different configurations were used: duplex, multilayer functionally graded and multilayer, with different combinations of commercial 8% yttria stabilized zirconia (8YSZ) and NiCrAlY (bond coat) layers. The prepared coatings were compared with the standard duplex 8YSZ thermal barrier coatings (TBCs) with a goal to study their suitability to serve as TBCs. TBCs layer thicknesses and interfaces were studied via SEM on polished cross section metallographic samples removed from the spray coated TBCs. Thermal fatigue resistance was evaluated by directing a gas flame on the ceramic surface at 1200 and 1400 C, followed by its rapid withdrawal and forced cooling by pedestal fan. The maximum number of thermal shock cycles the coatings could withstand before failure was determined. The multilayered TBCs with lanthanum cerate composition stacked with 8YSZ exhibited the superior thermal fatigue resistance characteristics compared to all other studied TBCs. The findings were correlated with the crystalline phases of the ceramic coatings, obtained via XRD, and discussed in the light of existing literature. 2023 University of Novi Sad, Faculty of Technology. All rights reserved.
- Source
- Processing and Application of Ceramics, Vol-17, No. 3, pp. 236-247.
- Date
- 2023-01-01
- Publisher
- University of Novi Sad, Faculty of Technology
- Subject
- pyrochlore oxides; structure; thermal barrier coatings; thermal fatigue
- Coverage
- Pasupuleti K.T., Department of Mechanical Engineering, School of Engineering & Technology, CHRIST (Deemed to be University), Bangalore Kengeri Campus, Bangalore, 560074, India; Vattappara K., Department of Mechanical Engineering, School of Engineering & Technology, CHRIST (Deemed to be University), Bangalore Kengeri Campus, Bangalore, 560074, India; Gomes S.A., Department of Mechanical Engineering, School of Engineering & Technology, CHRIST (Deemed to be University), Bangalore Kengeri Campus, Bangalore, 560074, India; Ramaswamy P., Department of Mechanical Engineering, School of Engineering & Technology, CHRIST (Deemed to be University), Bangalore Kengeri Campus, Bangalore, 560074, India
- Rights
- All Open Access; Gold Open Access
- Relation
- ISSN: 18206131
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Pasupuleti K.T.; Vattappara K.; Gomes S.A.; Ramaswamy P., “Thermal fatigue characteristics of 8Y2O3-ZrO2, La2Zr2O7, La2(Zr0.7Ce0.3)2O7 and La2Ce2O7 thermal barrier coatings in duplex, multilayer functionally graded and multilayer configurations,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 24, 2025, https://archives.christuniversity.in/items/show/14507.