Akademik Veri Yönetim Sistemi
Journal of Thermal Spray Technology, 2026 (SCI-Expanded, Scopus)
In this study, the aim was to enhance the CMAS resistance and thermal cycling lifetime of the environmental barrier coating produced by the atmospheric plasma spray method (APS) through laser glazing. In plasma-sprayed environmental barrier coatings, the transition from an amorphous to a crystalline phase under operational conditions leads to deterioration, reducing their longevity. The surface of the YbSi coating, which was applied to the SiC substrate using APS, was modified using a CO2 laser that operated at 1.5 kW power, had a wavelength of 10.6 µm, and moved at a speed of 170 mm/s. Thermal cycle tests were conducted to examine the influence of laser surface modification on the thermal cycling performance of the coatings in corrosive conditions. Microstructures before and after laser surface alteration were analysed using SEM with EDS capability. XRD investigations were conducted to examine phase changes prior to and following thermal cycle tests. Laser glazing converted the amorphous phases in the YbSi layer into crystalline structures. XRD investigations were conducted to examine phase changes before and following thermal cycle tests. After laser glazing, the surface crystallinity of the extremely amorphous EBC coating increased by 39%. After surface modification, the surface roughness value of the coating was improved by roughly 40%, and the thermal cycle life was enhanced by up to 10 times. After the thermal cycling test in corrosive environment, cross-sectional EDS results showed that the development of corrosive salts such as V, Na, and Ca in the coated region was improved by at least 50%. Moreover, surface EDS data showed that after laser modification, corrosive salts accumulated more than in the unglazed sample.