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Enhanced adhesion of coating layers by Ion Beam Mixing: An application for nuclear hydrogen production

Published online by Cambridge University Press:  17 August 2011

Jae-Won Park
Affiliation:
Korea Atomic Energy Research Institute, Daejon-City, South.Korea
Hyung-Jin Kim
Affiliation:
Korea Atomic Energy Research Institute, Daejon-City, South.Korea
Sunmog Yeo
Affiliation:
Korea Atomic Energy Research Institute, Daejon-City, South.Korea
Seong-Duk Hong
Affiliation:
Korea Atomic Energy Research Institute, Daejon-City, South.Korea
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Abstract

The bonding between two dissimilar materials has been a problem, partiularly in coating metals with non-metallic protective layer. In this work, it is demonstrated that a strong bonding between ceramics/metal can be achieved by mixing the atoms at the interface by ion-beam. Specifically, SiC coating on Hastelloy X was studied for a high temperature corrosion protection. Auger elemental mapping across the interface shows a far broader mixed region than the region expected by SRIM calculation, which is thought to be due to the thermal spike liquid state diffusion. The results showed that, although the thermal expansion coefficient of Hastelloy X is about three times higher than that of SiC, the film did not peel-off at above 900 oC confirming excellent adhesion. Instead, the SiC film was cracked along the grain boundary of the substrate above 700 oC. At above 900 oC, the film was crystallized forming islands on the substrate so that a considerable part of the substrate surface could be exposed to the corrosive environment. To cover the exposed area, it is suggested that the coating/IBM process should be repeated multiply.

Type
Research Article
Copyright
Copyright © Materials Research Society 2011

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