ANADOLU UNIVERSITY JOURNAL OF SCIENCE AND TECHNOLOGY –A, cilt.12, sa.2, ss.105-110, 2011 (Hakemli Dergi)
Thermal barrier coatings (TBCs) are widely used by aero and land based gas turbines to protect
hot section parts from oxidation and reducing component temperature thereby increase life. TBCs are
generally a combination of multiple layers of coating (usually two) with each layer having a specific
function [Aktaa et al., 2005]. In this study air plasma sprayed TBCs were deposited on 304 stainless
steel substrates then ceramic surfaces were glazed using Nd-YAG laser. Both glazed and as-coated
samples were subjected to metallographic examination to investigate microstructural changes in
glazed ceramic layer. Laser glazing provides a remelting and subsequent solidification of the surface,
resulting on new top layer microstructure.