Abstract
Laser surface modification of plasma sprayed alumina coatings were carried out for obtaining desired structural and microstructural transformations. Appearance of Raman modes was used to detect the transformation of Al 2O 3 from γ to α phase. Photoluminescence due to the natural occurrence of Cr 3+ ions was used to probe the densification and enhancement of the surface quality of the coatings brought about by laser treatment.
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