세미나&이벤트

세미나&이벤트

DANE’s Regular Seminar

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2023.02.22 / 857

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 Date: 2023. 02. 23(THU)

 Time: 4:30 ~ 5:30PM

 Venue : Research Building I, #310

 Speaker: Prof. Hwasung Yeom(POSTECH, DANE)

 Title: Development of cold spray Cr-coated Zirconium alloy cladding for Accident Tolerant Fuel (ATF)

 Abstract:

The development of a cold spray process for the deposition of chromium (Cr) coatings on zirconium-alloys is presented with the goal of improving the accident tolerance and extending the current burnup level of light water reactor (LWR) fuel cladding tubes. The cold spray parameters and feedstock powders were varied to attain the desired coating properties such as thickness, microstructure, and oxidation resistance, on both Zr-alloy flat specimens and cladding tubes. The coated samples were tested at temperatures up to 1410°C in steam to investigate the oxidation performance and inter-diffusion between the Cr coatings and the underlying zirconium-alloy substrate. To simulate the performance of the coatings under normal LWR operating conditions, the coated samples were also tested in prototypical PWR coolant condition as well as high energy heavy ion irradiation. Microstructures, phases, and mechanical properties of the feedstock powders and as-deposited coatings were examined, and oxidation and inter-diffusion profiles were quantified in post-oxidation test samples. Overall, cold sprayed Cr coatings show significant promise for enhancing the accident tolerance of zirconium-alloy fuel cladding in LWRs both in terms of performance and cost-effective manufacturability.