Research progress of high-temperature oxidation-resistant coatings on surface zirconium alloy
Zirconium alloys have become the primary structural materials in current nuclear reactors due to their low thermal neutron absorption cross-section,low thermal expansion coefficient and excellent compatibility with UO2.However,in high-temperature steam oxidation environments,zirconium alloys quickly oxidize and fail,generating large amounts of hydrogen and leading to hydrogen explosions.In order to enhance the safety of nuclear reactors,it is imperative to strengthen the surface of zirconium alloys to form high-temperature oxidation-resistant protective coatings,which represents an effective approach to addressing this challenge.This paper introduces the high-temperature oxidation behavior of zirconium alloy surfaces,focusing on the oxidation behavior and failure mechanisms of high-temperature oxidation-resistant coatings(including metal coatings ceramic coatings,and composite coatings),and comparatively analyzes the high-temperature oxidation performance of different coatings on surface of zirconium alloys.The development progress of multi-element composition design,preparation methods,and gradient structure design of high-temperature oxidation-resistant coatings on zirconium alloy surfaces were discussed.
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