Laser surface modification and characterization of air plasma sprayed alumina coatings

Krishnan, R. ; Dash, S. ; Kesavamoorthy, R. ; Babu Rao, C. ; Tyagi, A. K. ; Baldev Raj, (2006) Laser surface modification and characterization of air plasma sprayed alumina coatings Surface and Coatings Technology, 200 (8). pp. 2791-2799. ISSN 0257-8972

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S02578...

Related URL: http://dx.doi.org/10.1016/j.surfcoat.2005.05.002

Abstract

Surface modification and characterization of engineering components using high energy beams is an ever expanding and innovative area of research. Laser surface modification of plasma sprayed alumina coatings were carried out for transforming metastable γ-Al2O3 phase predominantly present in as-sprayed coating to a thermodynamically stable α-Al2O3 phase. These laser treated coatings were characterized using laser based non-destructive techniques like laser Raman spectroscopy, laser scattering, photoluminescence and piezospectroscopy for quantitative evaluation of the phase transformation, surface roughness, densification and residual stress associated with the coatings. Raman spectroscopic studies indicated the restoration of α-Al2O3 phase and laser scattering technique was used to optimize the processing parameters to obtain superior surface finish. Photoluminescence measurements have shown a marginal decline in residual stress and significant increase in density of the laser treated coatings.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Aluminium Oxide; Plasms Spraying; Laser Melting; Raman Scattering Spectroscopy; Photoluminescence Spectroscopy; Roughness
ID Code:40308
Deposited On:23 May 2011 12:03
Last Modified:23 May 2011 12:03

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