AlPO4–C composite coating for high emissivity and oxidation protection applications. (June 2013)

• Record Type: Journal Article
• Authors: Roy, S; Maharana, R; Gokul Laxmi, S; Sakthivel, Y; Roy, M; Bhanu Prasad, V V; Das, D K
• Is Part Of: Surface engineering. Volume 29:Number 5(2013)
• Page Start: 360
• Page End: 365
• Publication Date: 2013-06
• Subjects: Emissivity coating -- Nimonic 75 -- Oxidation resistance -- Sol–gel technique; Surfaces (Technology) -- Periodicals; Coatings -- Periodicals; 620.4405
• DOI: 10.1179/1743294413Y.0000000119
• Languages: English
• ISSNs: 0267-0844

Abstract

Abstract : AlPO4 –C coating deposited by sol–gel technique on Ni base superalloy substrate Nimonic-75 has been examined for high emissivity applications. The coating showed a spectral (2–25 μm wavelength) emissivity in the range of 0·8–0·91, and the emissivity increased with coating thickness. The coating exhibited a reasonably good adhesion with the substrate, as determined from nanoscratch test. The above coating also had a good oxidation resistance in air at 800 and 900°C under cyclic heating and cooling conditions.