High-temperature oxidation behavior of HiPIMS as-deposited Cr-Al-C and annealed Cr2AlC coatings on Zr-based alloy - Archive ouverte HAL Access content directly
Journal Articles Journal of Nuclear Materials Year : 2019

High-temperature oxidation behavior of HiPIMS as-deposited Cr-Al-C and annealed Cr2AlC coatings on Zr-based alloy

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Abstract

Protective coatings of Zr-based claddings have been proposed for the development of Accident Tolerant nuclear Fuel (ATF). Coatings forming stable oxides at high temperature such as MAX phases are attractive candidates for these applications. In this study Cr-Al-C coatings were deposited on coupons of Zr-based alloy (Zr702) by High Power Impulse Magnetron Sputtering (HiPIMS). Cr2AlC coatings were then obtained by annealing of the asdeposited films at a temperature below metallurgical degradation of Zr alloys. The behavior of as-deposited Cr-Al-C and annealed Cr2AlC coatings with respect to high-temperature oxidation slightly differ for short oxidation times but converge for longer durations. Oxidized coatings are made of (i) an external dense, covering, adherent and thin scale of aluminum and chromium oxides, (ii) an intermediate thicker, porous layer of chromium carbide and (iii) an interdiffusion layer. Both coatings are protective in dry and wet air (up to 1473 K for 2 h in air-28 % H2O for an initial thickness of 7 µm), and are thermal shock-resistant. Self-healing capability is observed for submicronic defects. The top oxide scale acts as a barrier against oxygen diffusion, thus efficiently protecting the Zr702 substrate from extended oxidation except near coupon edges. The results indicate that Cr-Al-C thin films grown by HiPIMS process and annealed Cr2AlC coatings are both promising candidates for ATF cladding coatings.
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Dates and versions

cea-02454803 , version 1 (21-12-2021)

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Attribution - NonCommercial - CC BY 4.0

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Michael Ougier, Alexandre Michau, Fernando Lomello, Frédéric Schuster, Hicham Maskrot, et al.. High-temperature oxidation behavior of HiPIMS as-deposited Cr-Al-C and annealed Cr2AlC coatings on Zr-based alloy. Journal of Nuclear Materials, 2019, pp.151855. ⟨10.1016/j.jnucmat.2019.151855⟩. ⟨cea-02454803⟩
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