Abstract
After the Fukushima nuclear accident, the concept of accident-tolerant fuel (ATF) cladding coating was proposed with the aim of increasing the rescue time in the case of an accident. Cr coatings are considered to be promising ATFs cladding materials for loss-of-coolant-accident conditions. The oxidation behavior of a Cr coating is dominated by the microstructure and defects formed during the deposition process. To endow the Cr coatings with excellent oxidation resistance under a high-temperature steam environment, we deposited Cr coatings on Zirlo substrates by high-impulse-power magnetron sputtering (HiPIMS), a technique that can optimize the microstructure of the coating compared to the traditional arc ion plating (AIP) technique. The results revealed that the HiPIMS-Cr coatings exhibited a better steam oxidation resistance, and their oxidation weight gains were 14.6% and 42.4% lower than those of AIP-Cr coatings at 1100 °C and 1200 °C, respectively.
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