Abstract
Cr coatings have been widely applied on Zircaloy for accident tolerant fuel materials. However, it has long been a great challenge in the nuclear community for Cr coatings surviving in the beyond design basis conditions (BDB) because of the unstable chromia layer and eutectic reactions between Cr and Zr. In this study, bi-layered CrAl-Mo coatings have been designed to improve the performance of Cr coatings in the BDB conditions. Results showed that the CrAl-Mo coated samples can tolerant in steam at temperatures as high as1400 °C because of the formation of a more stable alumina layer on the surface and the inhibition of eutectic reactions near the coating/substrate interface. Moreover, diffusion of Mo facilitated the formation of a CrAlMo layer, which stabilized the outer alumina layer and reserved the Al inventory within the coating.
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