Abstract
To develop a nuclear fuel cladding that has high tolerance under normal operating conditions and accident conditions, TiAlCrN coatings were deposited onto Zr substrates by multi-arc ion plating technique. After a corrosion test in static pure water at 360 °C and 18.5 MPa, the TiAlCrN coating showed no obvious spallation and had a weight gain of one order of magnitude less than that of the uncoated Zr sample. The decomposition and oxidation of the TiAlCrN coating at high temperature is an endothermic and exothermic reaction, respectively. Owing to the oxidation in the coating, the formed oxide layers reduce the oxygen penetration through the coating and also reduce the thickness of the zirconia layer from 300 μm to 10 μm at 1060 °C in air. This work lays the foundation for the next oxidation of TiAlCrN coating in high temperature steam, and demonstrates that TiAlCrN is a promising candidate material for the development of nuclear fuel cladding.
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