事故容错锆包壳表面FeCrAl 合金涂层的研究进展

The Fukushima nuclear accident in Japan exposed the fatal deficiency of zircaloy fuel cladding under loss of coolant accident (LOCA)conditions,i. e.,the reaction of zirconium with high-temperature steam. As a result,a research focus on the accident tolerant fuel (ATF)cladding materials with high security was triggered rapidly. Surface coating technologies provide a promising avenue for effectively improving the accident tolerance of zircaloy cladding in service. FeCrAl alloy,due to its excellent oxidation resistance and mechanical properties at high temperatures,becomes one of the candidate coating materials with great development potential for ATF claddings. This paper mainly reviewed the preparation technologies,composition and microstructure,service performances (including mechanical properties,oxidation resistance,corrosion resistance and anti-irradiation),and the relevant failure mechanisms of FeCrAl alloy coating. Moreover,the existed problems of FeCrAl coating / zircaloy cladding system in the engineering applications were also discussed,with prospecting the future direction of development.