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针对软第二相Cr稍微降低Laves相NbCr2合金的1200℃抗氧化性,采用Al、Si及Y多元合金化来提高Cr-20Nb合金的高温抗氧化性能。结果表明,多元合金化的Cr-20Nb合金1100℃及1200℃抗氧化性均好于加入单一合金化的及纯Cr-20Nb合金,并随着Si合金元素含量增加,Cr-20Nb合金的氧化增重变小,抗氧化性变好;SEM结果表明,添加合金元素后,氧化膜与基体的粘附性得到了明显提高。
The soft second phase Cr slightly reduces the oxidation resistance of Laves phase NbCr2 alloy at 1200 ℃. Al, Si and Y alloying are used to improve the high temperature oxidation resistance of Cr-20Nb alloy. The results show that the oxidation resistance of multi-alloying Cr-20Nb alloy at 1100 ℃ and 1200 ℃ is better than that of single alloying and pure Cr-20Nb alloy. With the increase of elemental Si content, the oxidation of Cr-20Nb alloy increases Smaller and smaller, oxidation resistance becomes better; SEM results show that the addition of alloying elements, the adhesion of the oxide film and the substrate has been significantly improved.