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研究了三元复相合金Cu-20Ni-30Cr(at%)在700℃和800℃纯氧气中的氧化行为。合金由三相组成,具有最大Cu浓度和最小Cr浓度的α相为合金的基体,中间浓度的Ni和Cr的β相和富Cr的γ相以颗粒状态分布在合金基体中。合金在2个温度下的氧化动力学曲线偏离抛物线规律,其氧化增重随时间延长而降低,合金氧化速率随温度升高而加快。合金形成了复杂的氧化膜结构,外层为富Cu氧化物,中间层为尖晶石层,最内层为不规则但连续的Cr2O3膜。合金中的复相组织限制Cr在合金中的扩散,抑制了外氧化膜的形成。
The oxidation behavior of ternary complex phase Cu-20Ni-30Cr (at%) in pure oxygen at 700 ℃ and 800 ℃ was studied. The alloy is composed of three phases, the α phase with the maximum Cu concentration and the minimum Cr concentration is the matrix of the alloy, and the intermediate concentration of Ni and the β phase of Cr and the γ phase rich in Cr are distributed in the alloy matrix in the particle state. The oxidation kinetics curve of the alloy deviates from the parabolic law at two temperatures. The oxidation weight gain decreases with time, and the oxidation rate of the alloy increases with increasing temperature. The alloy formed a complex oxide film structure, the outer layer is rich in Cu oxide, the middle layer is a spinel layer, the innermost layer is an irregular but continuous Cr2O3 film. The complex phase in the alloy limits the diffusion of Cr in the alloy and suppresses the formation of the outer oxide film.