Interaction of a diffusion barrier from the refractory metals with a zirconium alloy and a chrome coating of an accident tolerant fuel

Isayev, R.S.; Джумаев, П. С.

doi:10.1016/j.nucengdes.2023.112307

Cited by 13 publications

(1 citation statement)

References 25 publications

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“…Thus, the thinner the ZrO 2 /Cr multilayer coating, the more cavities were observed in the cross-section of the samples after steam oxidation. It is assumed that Mo, Re, Nb, and Ta are potentially applicable as barrier interlayers due to their high melting points and low diffusion coefficients in Zr [13,24,25]. However, Nb has high solubility in zirconium [26], and rhenium has a rather high thermal neutron capture cross-section of 89.7 barn [27].…”

Section: Introductionmentioning

confidence: 99%

Barrier Properties of Cr/Ta-Coated Zr-1Nb Alloy under High-Temperature Oxidation

Syrtanov,

Korneev,

Kashkarov

et al. 2024

Metals

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In this paper, Cr (8 μm)/Ta (3 μm) bilayer coatings deposited on a Zr-1Nb alloy substrate were investigated and compared with a Cr-coated alloy under high-temperature steam oxidation at 1200–1400 °C. The bilayer coatings with α- and β-Ta interlayers were obtained by magnetron sputtering. The Cr/Ta-coated samples were studied using scanning electron microscopy (SEM), X-ray diffraction (XRD), and optical microscopy (OM). The coating with an α-Ta interlayer can suppress the interdiffusion of chromium and zirconium more effectively up to 1330 °C in comparison with the coating having a β-Ta interlayer. The weight gain of the α-Ta-coated samples after oxidation at 1200 °C for 2000 s was 5–6 times lower than that of the Cr-coated Zr alloy samples. Oxidation at 1400 °C for 120 s showed no significant difference in the weight gain of the Cr- and Cr/Ta-coated Zr-1Nb alloy samples. It was shown that the effect of suppression of Zr-Cr interdiffusion by the barrier coating (α- and β-Ta) is only short-term.

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