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http://dx.doi.org/10.6111/JKCGCT.2012.22.4.183

High temperature properties of surface-modified Hastelloy X alloy  

Cho, Hyun (Department of Nanomechatronics Engineering, Pusan National University)
Lee, Byeong-Woo (Department of Materials Engineering, Korea Maritime University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.22, no.4, 2012 , pp. 183-189 More about this Journal
Abstract
Surface treatments and their effects on high temperature properties for the Hastelloy X, which is a promising candidate alloy for high temperature heat-transport system, have been evaluated. For TiAlN and $Al_2O_3$ overlay coatings, the two different PVD (physical vapor deposition) methods using an arc discharge and a sputtering, were applied, respectively. In addition, a different surface treatment method of the diffusion coating by a pack cementation of Al (aluminiding) was also adopted in this study. To achieve enhanced thermal oxidation resistance at $1000^{\circ}C$ by suppressing the inhomogeneous formation of thick $Cr_2O_3$ crust at the surface region, a study for the surface modification methods on the morphological and structural properties of Hastelloy X substrates has been conducted. The structural and compositional properties of each sample were characterized before and after heat-treatment at $1000^{\circ}C$ under air and He environment. The results showed that the Al diffusion coating showed the more enhanced high temperature properties than the overlay coatings such as the suppressed thick $Cr_2O_3$ crust formation and lower wear loss.
Keywords
Hastelloy X; Surface modification; Overlay coating; Diffusion coating; High temperature properties;
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