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http://dx.doi.org/10.6111/JKCGCT.2012.22.5.227

Thermal stability of surface modified Ni-Cr-alloys in molten FLiNaK salt  

Kwang, Hyun Cho (Department of Nanomechatronics Engineering, Pusan National University)
Bang, Hyun (Division of Mechanical and Energy Systems Engineering, Korea Maritime University)
Lee, Tae Suk (Department of Materials Engineering, Korea Maritime 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.5, 2012 , pp. 227-232 More about this Journal
Abstract
Inconel 617 and Hastelloy X are the most promising candidate materials for the heat exchanger of next generation nuclear reactor. Surface coating and its effects on high temperature properties for the Inconel 617 and Hastelloy X under molten FLiNaK (LiF-NaF-KF) salt environment have been investigated. For TiAlN and $Al_2O_3$ overlay coatings, the two different PVD (physical vapor deposition) methods of an arc discharge and a sputtering were applied, respectively. A study for the thermal stability of the surface modified Ni-Cr alloy substrates has been conducted. To evaluate the corrosion mechanism of Ni-Cr alloys in the molten salt, a ruptured Inconel pipe used for the molten salt transportation has been analyzed. The thermal properties of morphological and structural properties each sample were characterized before and after heat-treatment at $600^{\circ}C$ in molten FLiNaK salt. The results showed that the TiAlN and $Al_2O_3$ overlay coated specimens had the enhanced high temperature stability.
Keywords
Inconel 617; Hastelloy X; FLiNaK salt; Coating; Thermal stability;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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