Oxidation behavior of thermal barrier coatings modified by laser remelting
Journal
Surface and Coatings Technology
Journal Volume
102
Journal Issue
3
Pages
197-204
Date Issued
1998
Author(s)
Abstract
In this study, a bond coat (Ni-22Cr-10Al-1Y (wt%)) and a top coat (ZrO2-7.5 wt% Y2O3) were deposited on 304 stainless steel by air plasma spraying and then processed with either single laser remelting (SLR) or double laser remelting (DLR) treatment. Preheating specimens at 950 °C in the SLR treatment reduced depressions and the width of cracks in the top coat. A recently developed DLR treatment, in which zirconia powder in the form of a colloidal suspension was applied after SLR and then laser remelted again, helped to lower the extent of surface defects in the top coat significantly. Oxidation tests at 1200 °C indicated that the DLR specimens had a better oxidation resistance than the SLR and the plasma-sprayed specimens. © 1998 Published by Elsevier Science S.A.
SDGs
Type
journal article