TITLE:
Effect of Pulsed Laser on the Structure and Morphology of Alumina-Zirconia Coatings
AUTHORS:
Hala Omar, Ahmed Ibrahim, Hanadi Salem, Sherif Sedky
KEYWORDS:
Laser Annealing; Alumina-Zirconia Coatings; Surface Morphology; Plasma Sprayed Coatings
JOURNAL NAME:
Journal of Surface Engineered Materials and Advanced Technology,
Vol.3 No.3,
July
12,
2013
ABSTRACT: The effect
of excimer laser annealing on the structure and morphology of ceramic coatings
were investigated. Alumina-40% zirconia (AZ-40) coatings were sprayed with a
water-stabilized plasma spray gun. The coated surface was treated by excimer
laser having a wavelength of 248 nm and pulse duration of 24 ns. The surface
structure of the treated coating was examined by field emission scanning
electron microscope (FESEM) and X-ray diffraction (XRD). A detailed parametric
study was performed to investigate the effects of different parameters such as
laser energy density (fluence), pulse repetition rate (PRR), and the number of shots on the mechanical properties, surface morphology, and
microstructure of the coatings. The results of this study indicated that laser
energy and pulse repetition rate have significant effects on surface
morphology, porosity, and microstructure of the coating.