Microstructural Characterization of Thermal Barrier Coatings Glazed by a High Power Laser

Hong Zhou; Fei Li; Jun Wang; Bao De Sun

doi:10.4028/www.scientific.net/KEM.723.247

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 723Microstructural Characterization of Thermal...

Microstructural Characterization of Thermal Barrier Coatings Glazed by a High Power Laser

Abstract:

Thermal barrier coatings have been widely used in in both energy and propulsion systems. Plasma-sprayed thermal barrier coatings have relatively high interconnected porosity and lamina structure, which bring out a low bond strength, and lead to a short thermal cycling life. Lasers can be used for modification of materials surface. In this paper, plasma-sprayed thermal barrier coatings were laser-glazed by a high power laser in order to modify the structures. The microstructure of laser-glazed TBCs is investigated. The change on surface roughness has been examined. The result indicates that a smooth and dense glazed surface with craters and a network of microcracks is obtained after laser-glazing. The laser-glazed region consists of a columnar microstructure. There are segmentation microcracks in the laser-glazed coatings, which don’t run through the coatings along thickness. Surface roughness has been reduced significantly for the laser treated ceramic coatings.

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Proceedings of International Conference on Material Science and Engineering 2016

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Periodical:

Key Engineering Materials (Volume 723)

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247-251

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.723.247

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Online since:

December 2016

Authors:

Hong Zhou*, Fei Li, Jun Wang, Bao De Sun

Keywords:

Microstructure, Plasma Spray, Surface Laser-Glazing, Thermal Barrier Coatings

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