Effect of plasma spray distance on the features and hardness reliability of YSZ thermal barrier coating
In this paper hardness reliability and porosity features of plasma sprayed yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) as a function of variable spray distance parameter have been investigated. Microstructures details that include porosity and crack densities were studied using...
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| Published in: | Materials today : proceedings Vol. 42; pp. 2553 - 2560 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Elsevier Ltd
2021
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | In this paper hardness reliability and porosity features of plasma sprayed yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) as a function of variable spray distance parameter have been investigated. Microstructures details that include porosity and crack densities were studied using Field Emission Scanning Electron Microscopy (FESEM). Morphology and surface roughness were investigated through AFM analysis and central line average (CLA). Phases and chemical composition of the coating were characterized using XRD and EDS analysis. The distributions of plasma sprayed coatings hardness are highly scattered. The Weibull’s distribution was the best approach to describe the plasma sprayed coating hardness. The results indicated that the cohesion between splats mainly controls by the spray distance. By increasing the spray distance from 70 mm to 130 mm; the amount of surface roughness increased due to non-melted or insufficient melted of particles powder. Among the studied samples; the coating at spray distance 100 mm exhibited desirable microstructure and microhardness values. |
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| ISSN: | 2214-7853 2214-7853 |
| DOI: | 10.1016/j.matpr.2020.12.578 |