Abstract
Laser surface annealing provides a rapid and efficient means for surface alloying and modification of ceramic materials. In this study, Alumina-13% Titania 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 and X-ray diffraction (XRD). A detailed analysis of the effects of various laser parameters including laser energy density (fluence), pulse repetition rate (PRR), and number of pulses on the morphology and the microstructure of the coatings are presented.
Highlights
Plasma sprayed alumina-13% titania (AT-13) coating is one of the most important coatings for many industrial applications [1,2,3,4,5,6,7]
Free-standing AT-13 coatings were produced by a water-stabilized plasma (WSP) spray gun to obtain a thickness of 5 mm; Table 1 lists the spray parameters
The porosity of the laser treated layers was greatly reduced compared to the untreated coating. This effect is attributed to the heat accumulation in the sample at higher pulse repetition rate. These results strongly suggest that the pulse repetition rate has a significant effect on the surface morphology of AT-13 coatings. 3.4
Summary
Plasma sprayed alumina-13% titania (AT-13) coating is one of the most important coatings for many industrial applications [1,2,3,4,5,6,7]. This is due to the fact that Excimer lasers operate in the ultraviolet region of the spectrum at wavelengths from 190 nm to 310 nm At these short wavelengths the reflectivity of most metals and ceramics is lower than at longer wavelengths and the absorptivity is higher [20]. In this investigation, Excimer laser was used for the surface annealing of free-standing AT-13 samples that were manufactured with a plasma spray gun. A detailed parametric study was performed to investigate the effects of several parameters such as laser energy density (fluence), pulse repetition rate (PRR), number of pulses on the mechanical properties, surface morphology, and microstructure of the coatings
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Surface Engineered Materials and Advanced Technology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
