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采用增重法研究了w(Al)=5%~10%的HP40合金在1 200℃×30 h空气中的抗氧化性能。结果表明,铝可显著提高合金的高温抗氧化性能,而且合金的高温抗氧化性能随铝含量增加而提高。1 200℃时,合金氧化增重与氧化时间的关系呈抛物线规律,氧化速率随氧化时间延长而逐渐下降。加入铝,改变了合金氧化膜层的物相组成和致密度,含铝合金的氧化层中含有Al2O3,而且Al2O3量随铝加入量增加而增多。
The anti-oxidation properties of HP40 alloy w (Al) = 5% ~ 10% in air at 1 200 ℃ for 30 h were studied by weight gain method. The results show that aluminum can significantly improve the high temperature oxidation resistance of the alloy, and the high temperature oxidation resistance of the alloy increases with the increase of aluminum content. At 200 ℃, the relationship between the weight gain and the oxidation time of the alloy shows a parabolic law. The oxidation rate decreases gradually with the increase of the oxidation time. Addition of aluminum changed the phase composition and density of the oxide layer of the alloy. The oxide layer of the aluminum-containing alloy contained Al2O3, and the amount of Al2O3 increased with the addition of aluminum.