开发了一种新型镍基高温合金(Ni48Cr28W5Co3Mn1Si1.6)并研究微量混合稀土对其氧化性能的影响。在950~1150°C 下进行100 h 的等温氧化试验，并对试样进行 SEM 和 XRD 分析。结果表明，添加和不添加混合稀土的试样，其氧化增重均满足抛物线规律。加入少量混合稀土对氧化增重影响很小，加入0.20%稀土的试样，其氧化速率常数降低5.9%~9.0%。常温氧化100 h 后，氧化产物为 MnCr2O4、Cr2O3和 SiO2。氧化层共3层，最外层为连续有保护性的 MnCr2O4尖晶石层，中间层是致密的 Cr2O3，最内层为不连续的 SiO2层。
A new Ni-based superalloy Ni48Cr28W5Co3Mn1Si1.6 was developed and the influence of a trace amount of rare earth (RE) metal addition on the oxidation resistance of this alloy was investigated. Isothermal oxidation behavior was investigated at 950?1150 °C in air, and then analyzed using scanning electronic microscopy and X-ray diffraction. The results showed that oxidation mass gain kinetics of the samples with and without RE elements follow the parabolic law. The effect of 0.20% RE on oxidation resistance is relatively small, and the oxidation rate constant of the alloy modified with 0.20% RE addition decreases by 5.9%?9.0%. Oxidation at 950?1150 °C for 100 h results in the formation of MnCr2O4, Cr2O3 and SiO2. A continuous and protective MnCr2O4 spinel layer forms as outer layer. The continuous middle oxide layer is confirmed to be Cr2O3, and the innermost layer consists of discontinuous SiO2.
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