Development & Characterization of Alumina Coating by Atmospheric Plasma Spraying
| Autor: | Abyson Scaria, Don George Kurian, Jobin Sebastian |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Oxide Atmospheric-pressure plasma 02 engineering and technology General Medicine Substrate (printing) engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Abrasive blasting Corrosion law.invention chemistry.chemical_compound chemistry Coating law visual_art 0103 physical sciences visual_art.visual_art_medium engineering Surface roughness Ceramic Composite material 0210 nano-technology |
| Zdroj: | Applied Mechanics and Materials. 877:104-109 |
| ISSN: | 1662-7482 |
| DOI: | 10.4028/www.scientific.net/amm.877.104 |
| Popis: | Ceramic coatings are applied on metals to prevent them from oxidation and corrosion at room as well as elevated temperatures. The service environment, mechanisms of protection, chemical and mechanical compatibility, application method, control of coating quality and ability of the coating to be repaired are the factors that need to be considered while selecting the required coating. The coatings based on oxide materials provides high degree of thermal insulation and protection against oxidation at high temperatures for the underlying substrate materials. These coatings are usually applied by the flame or plasma spraying methods. The surface cleanliness needs to be ensured before spraying. Abrasive blasting can be used to provide the required surface roughness for good adhesion between the substrate and the coating. A pre bond coat like Nickel Chromium can be applied on to the substrate material before spraying the oxide coating to avoid chances of poor adhesion between the oxide coating and the metallic substrate. Plasma spraying produces oxide coatings of greater density, higher hardness, and smooth surface finish than that of the flame spraying process Inert gas is often used for generation of plasma gas so as to avoid the oxidation of the substrate material. The work focuses to develop, characterize and optimize the parameters used in Al2O3 coating on transition stainless steel substrate material for minimizing the wear rate and maximizing the leak tightness using plasma spray process. The experiment is designed using Taguchi’s L9 orthogonal array. The parameters that are to be optimized are plasma voltage, spraying distance and the cooling jet pressure. The characterization techniques includes micro-hardness and porosity tests followed by Grey relational analysis of the results |
| Databáze: | OpenAIRE |
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