[논문]Microstructural characterization of accident tolerant fuel cladding with Cr-Al alloy coating layer after oxidation at 1200 ℃ in a steam environment

Park, Dong Jun; Jung, Yang Il; Park, Jung Hwan; Lee, Young Ho; Choi, Byoung Kwon; Kim, Hyun Gil

doi:10.1016/j.net.2020.04.005

Microstructural characterization of accident tolerant fuel cladding with Cr-Al alloy coating layer after oxidation at 1200 ℃ in a steam environment 원문보기

Nuclear engineering and technology : an international journal of the Korean Nuclear Society, v.52 no.10, 2020년, pp.2299 - 2305

Park, Dong Jun (Korea Atomic Energy Research Institute) , Jung, Yang Il (Korea Atomic Energy Research Institute) , Park, Jung Hwan (Korea Atomic Energy Research Institute) , Lee, Young Ho (Korea Atomic Energy Research Institute) , Choi, Byoung Kwon (Korea Atomic Energy Research Institute) , Kim, Hyun Gil (Korea Atomic Energy Research Institute)

Abstract ▼ AI-Helper

Zr alloy specimens were coated with Cr-Al alloy to enhance their resistance to oxidation. The coated samples were oxidized at 1200 ℃ in a steam environment for 300 s and showed extremely low oxidation when compared to uncoated Zr alloy specimens. The microstructure and elemental distribution of the oxides formed on the surface of Cr-Al alloys have been investigated by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). A very thin protective layer of Cr2O3 formed on the outer surface of the Cr-Al alloy, and a thin Al2O3 layer was also observed in the Cr-Al alloy matrix, near the surface. Our results suggest that these two oxide layers near the surface confers excellent oxidation resistance to the Cr-Al alloy. Even after exposure to a high temperature of 1200 ℃, inter-diffusion between the Cr-Al alloy and the Zr alloy occurred in very few regions near the interface. Analysis of the inter-diffusion layer by high-resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray spectroscopy (EDS) measurement confirmed its identity as Cr2Zr.

주제어

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제안 방법

Therefore, the XPS analysis results represent elemental characteristics of a very thin section of the surface and cannot be considered to represent the characteristics of the overall oxide layer. For microstructural characterization of a more representative oxide layer formed on the Cr-Al alloy layer, the cross-sectional area near the surface region containing the entire oxide layer was characterized by STEM. Fig.
In this study, we used a Cr-10 wt% Al alloy to coat the Zr-based alloy to improve its temperature resistance during LOCA scenarios. Zr-based alloy samples coated with a Cr-Al layer were exposed to a temperature of 1200 ℃ in a steam environment.
Uncoated Zr-based alloy was also exposed to the same test conditions to compare the efficacy of the coating layer. The microstructure and elemental distribution of the oxides formed on the surface of the Cr-Al alloy, the Cr-Al alloy matrix, and the interfacial region between the coated Cr-Al alloy and Zr-based alloy were analyzed in detail, using field emission transmission electron microscopy (FETEM). X-ray photoelectron spectroscopy (XPS) was also used to confirm the exact elemental composition, chemical state, and electronic state of the elements in the oxides formed on the Cr-Al alloy.

대상 데이터

The arc current and the substrate bias voltage during the Cr-Al alloy layer deposition were 80 A and -200 V, respectively. High purity Ar gas (99.999%) was introduced into the deposition chamber to maintain the working pressure at 20 mTorr. The pressure of the Ar gas at the inlet was kept at 1 × 10^-2Torr during the deposition phase.

성능/효과

2. Although the diamond-structured Cr₂Zr inter-diffusion layer was formed at the interfacial region between the Cr-Al coating layer and the Zr matrix, it was very thin, measuring about 1.145 mm, despite the long exposure at high temperature.
3. The Cr-Al coating layer showed complex microstructures near the outer surface region because of oxygen diffusion into the Cr-Al alloy matrix, while the columnar structure near the interface was maintained after high-temperature oxidation.
4. Cr oxide phases such as Cr₂O₃, together with CrO₂, and CrO₃ were present near the outer oxide surface; the predominant phase was Cr₂O₃. The Cr-Al alloy layer below the Cr oxide showed a continuous long strip of an Al₂O₃ layer perpendicular to the surface.

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