Abstract
The high-temperature oxidation of the Zr-3 mass% Cu alloy and Zr 2Cu in oxygen is characterized by selective oxidation of zirconium while the excess of copper is accumulated at the alloy–oxide interface forming the Zr 8Cu 5 phase. The oxidation of Zr 2Cu at elevated temperatures shows an anomalous decrease of the oxygen consumption rate in the temperature range 890–975 °C. The oxide layer consists of monoclinic ZrO 2 mainly, with preferentially oriented crystallites in depth region at 900 °C and tetragonal ZrO 2 on the surface below 600 °C, and small amounts of CuO and Cu 2O. The reaction kinetics obeys a parabolic rate law. The activation energy of 117.5 and 54.4 kJ/mol has been estimated for the oxidation of the Zr-3 mass% Cu alloy and Zr 2Cu, respectively.
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