The high-temperature oxidation behavior of a novel γ′-strengthened CoNi-base superalloy was investigated by isothermal oxidation in air at 700 °C and 900 °C. The results show that the superalloy formed a multilayered oxide scale at the two temperatures, exhibiting parabolic oxidation kinetics. Theoretical calculations suggest that the alloy Al content was insufficient to form a protective alumina scale and elevating temperature was beneficial for reducing the critical Al concentrations required for alumina scale formation. In agreement with the predications, a discontinuous alumina band was developed at the oxidation front as the temperature was increased from 700 to 900 °C.

通过在空气中 700 °C 和 900 °C 等温氧化，研究了新型γ ' 强化 CoNi 基高温合金的高温氧化行为。结果表明，高温合金在两个温度下形成了多层氧化皮，表现出抛物线氧化动力学。理论计算表明，合金中的Al含量不足以形成保护性氧化铝垢，升高温度有利于降低形成氧化铝垢所需的临界Al浓度。与预测一致，当温度从 700 °C 升高到 900 °C 时，在氧化前沿形成了不连续的氧化铝带。