Laser induced structural and microstructural transformations of plasma sprayed Al2O3 coatings

Air plasma sprayed Al2O3 coatings on metallic substrates suffer from porosities and metastable polymorphs. In this study, laser treatment employed to improve the coating properties resulted in transformation of the as-sprayed coating predominantly consisting of metastable gamma-Al2O3 into thermodyna...

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Bibliographic Details
Published in:Scripta materialia 2001-09, Vol.45 (6), p.693-700
Main Authors: KRISHNAN, R, DASH, S, BABU RAO, C, SUBBA RAO, R. V, TYAGI, A. K, RAJ, Baldev
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Methods of deposition of films and coatings
film growth and epitaxy
Physics
Spray coating techniques
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Summary:Air plasma sprayed Al2O3 coatings on metallic substrates suffer from porosities and metastable polymorphs. In this study, laser treatment employed to improve the coating properties resulted in transformation of the as-sprayed coating predominantly consisting of metastable gamma-Al2O3 into thermodynamically stable alpha-Al2O3 phase with enhanced microhardness and reduced surface roughness. (Author)
ISSN:1359-6462
1872-8456
DOI:10.1016/S1359-6462(01)01081-8