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钴-铝-钨合金是一种由γ′-Co3(Al,W)相沉淀强化的新型钴基高温合金。测定了该合金在800和900℃下空气氧化增重动力学数据,通过线性拟合得到合金在不同温度下的氧化速率常数。根据氧化速率常数的Arrhenius关系,计算合金在800和900℃高温环境中的氧化激活能。研究发现,7.5W、9W和10.7W合金中9W合金氧化激活能最高;合金元素Mo、Nb、Ta和Ti加入之后,Co-Al-W合金的氧化增重和氧化激活能发生变化,由此可以预测该合金在高温环境中的抗氧化能力。
Cobalt-aluminum-tungsten alloy is a new cobalt-based superalloy strengthened by γ’-Co3 (Al, W) phase precipitation. The kinetic data of air oxidation at 800 and 900 ℃ were measured. The oxidation rate constant of the alloy at different temperatures was obtained by linear fitting. According to the Arrhenius relationship of the oxidation rate constants, the oxidation activation energies of the alloys at 800 and 900 ℃ were calculated. The results show that the oxidation activation energy of 9W alloy is the highest in 7.5W, 9W and 10.7W alloys. The oxidation weight gain and oxidation activation energy of Co-Al-W alloy change after alloying elements Mo, Nb, Ta and Ti are added. It can predict the oxidation resistance of the alloy in high temperature environment.