Properties of alumina–titania coatings prepared by laser-assisted air plasma spraying

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DOIResolve DOI: http://doi.org/10.1016/j.surfcoat.2006.11.026
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TypeArticle
Journal titleSurface & Coatings Technology
Volume201
Issue14
Pages62786284; # of pages: 7
SubjectLaser-assisted air plasma spraying; Alumina-titania; Erosive wear; Abrasive wear
AbstractStudies have shown that microstructures formed by post-laser remelting of air plasma sprayed coatings exhibit densification but also numerous macrocracks due to the rapid cooling and thermal stresses. In laser-assisted air plasma spraying (LAAPS) process, the laser beam interacts simultaneously with the plasma torch in order to increase the temperature of the coating and possibly remelt the coating at the surface. As a result, the microstructure is partially densified and macrocracks, which are generally produced in the post-laser irradiation treatment, may be inhibited. In this paper, LAAPS was performed to improve the hardness and wear resistance of Al₂O₃–13%TiO₂ coatings. These coatings prepared by air plasma spraying (APS) are widely used to protect components against abrasive wear at low temperatures. The coating microstructure was characterized by SEM and X-ray diffraction. The mechanical characterization was done by hardness measurements, erosive wear tests and abrasion wear tests. Results showed that laser assistance may improve the microstructural and mechanical properties. Phenomena involved in LAAPS of alumina–titania coatings are discussed in this paper.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number49405
AMTC-2008-0036
NPARC number15820153
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Record identifierbac13786-3604-4b4b-8dc8-aef6d9b3826d
Record created2010-07-19
Record modified2016-05-09
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