Synthesis and Studies on Partially Stabilized Zirconia and Rare-Earth Zirconate Pyrochlore Structured Multilayered Coatings
- Title
- Synthesis and Studies on Partially Stabilized Zirconia and Rare-Earth Zirconate Pyrochlore Structured Multilayered Coatings
- Creator
- Teja Pasupuleti K.; Manikanta Dunna U.; Ghosh S.; Ramaswamy P.; Murty Svs N.
- Description
- This work is focused on the thermal fatigue behaviour studies of ceramic coatings, as TBC (Thermal Barrier Coating) system, its importance in determining the thermo-mechanical properties and service-life estimation of the coatings when exposed to elevated operating temperatures. Commercial 6-8%Yttria stabilized zirconia (YSZ) top coat (TC) and NiCrAlY bond coat (BC) in (a) conventional YSZ (BC and TC), (b) multi-layered functionally graded materials (FGM) i.e., BC-blend (50BC+50TC)-(TC) configuration and (c) lab synthesized Zirconia based pyrochlore (Lanthanum Zirconate-LZ) were the coating materials involved. Nickel based super alloy Inconel 718 substrates were coated by using Atmosphere Plasma Spray (APS) system with three different (varying power) plasma spray parameters. All the sides of the 25mm x 10mm x 5mm thick substrates were completely covered with the bond coat and ceramic coating. FGM configuration was spray coated only on one side of the Inconel flat plates. Thermal shock cycle tests were performed on the coated specimen by following the ASTM B214-07 guidelines which comprised of introducing the coated specimen in a muffle furnace at 1150C, held in it for 2 minutes before removing from furnace followed by forced fan air cooling (one shock cycle). The specimen were periodically subjected to visual inspection for faults, before continuing the shock cycles, until the coating flaked off or cracked or detached from substrate. Cross section metallographic samples were prepared and analysed under SEM (Scanning Electron Microscope) and Energy Dispersive spectroscope (EDS) to study the as-sprayed coating morphology and interface quality, measure coating thickness, study defects characteristics and the chemical composition. Crystal structural phases were analysed using X-Ray Diffraction (XRD). 2019 Elsevier Ltd.
- Source
- Materials Today: Proceedings, Vol-22, pp. 1244-1252.
- Date
- 2019-01-01
- Publisher
- Elsevier Ltd
- Subject
- Thermal barrier coatings; Thermal shock cycles; Zirconia based pyrochlore
- Coverage
- Teja Pasupuleti K., Department of Mechanical and Automobile Engineering, CHRIST (Deemed to Be University), Bangalore, 560074, India; Manikanta Dunna U., Department of Mechanical and Automobile Engineering, CHRIST (Deemed to Be University), Bangalore, 560074, India; Ghosh S., Department of Mechanical and Automobile Engineering, CHRIST (Deemed to Be University), Bangalore, 560074, India; Ramaswamy P., Department of Mechanical and Automobile Engineering, CHRIST (Deemed to Be University), Bangalore, 560074, India; Murty Svs N., Materials Characterization Division, Vikram Sarabhai Space Center, Trivandrum, 695022, India
- Rights
- Restricted Access
- Relation
- ISSN: 22147853
- Format
- Online
- Language
- English
- Type
- Conference paper
Collection
Citation
Teja Pasupuleti K.; Manikanta Dunna U.; Ghosh S.; Ramaswamy P.; Murty Svs N., “Synthesis and Studies on Partially Stabilized Zirconia and Rare-Earth Zirconate Pyrochlore Structured Multilayered Coatings,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 24, 2025, https://archives.christuniversity.in/items/show/20828.