ArticleNpj Materials degradation2026
Exceptional irradiation and corrosion resistances of a TaC nanoceramic coating deposited onto ZIRLO™ fuel cladding.
Article in Npj Materials degradation, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Improving the accident tolerance of zirconium-based nuclear fuel claddings is essential to mitigate oxidation-driven hydrogen generation under loss-of-coolant conditions. Here, a nanostructured tantalum carbide (TaC) ceramic coating is deposited onto ZIRLO™ fuel cladding by non-reactive DC magnetron sputtering. The coating was systematically assessed with respect to its microstructural stability, irradiation tolerance, and corrosion behaviour. Characterisation of as-deposited coating confirms a dense, nanocrystalline B1-type TaC structure with excellent adhesion and negligible interdiffusion at the coating-substrate interface. In situ transmission electron microscopy with heavy-ion irradiation up to ~8 dpa reveals exceptional radiation resistance, with no evidence of amorphization, phase decomposition, or radiation-induced segregation. Limited grain coarsening and the formation of Xe bubbles (~2 nm) were observed. Electrochemical measurements in borated aqueous media demonstrated rapid passivation, very low corrosion current densities, and high impedance over prolonged exposure. These results identify nanostructured TaC as a robust and scalable candidate coating for accident-tolerant fuel cladding systems.
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