摘要
研究了两种不同Cr含量的常规熔炼Ni Cr Al合金在1000℃空气中的氧化行为.合金氧化动力学遵循抛物线规律,Ni 20Cr 2 5Al合金在1000℃的氧化增重略小于Ni 15Cr 2 5Al合金,二者的氧化增重都明显小于Ni 20Cr合金.Ni 20Cr 2 5Al合金1000℃氧化后形成了外层的Cr2O3及内层极薄的Al2O3型氧化膜,在Ni Cr合金中加入Al,由于Cr、Al的相互作用,降低了形成Cr2O3和Al2O3外氧化膜所需的Cr或Al的临界含量,促进了保护性Al2O3或Cr2O3膜的生成.
The oxidation behavior of Ni-15Cr-2.5Al and Ni-20Cr-2.5Al alloys prepared by conventional casting in air at 1000℃ was investigated. The scaling kinetics follows only approximately the parabolic rate law. The mass gains of Ni-20Cr-2.5Al and Ni-15Cr-2.5Al alloy are much less than those of Ni-15Cr and Ni-20Cr, while the mass gain of Ni-20Cr-2.5Al is less than that of Ni-15Cr-2.5Al. A simple scale consisting of continuous outer layer Cr_2O_3 and much thinner inner layer Al_2O_3 was produced at 1000℃ in Ni-20Cr-2.5Al alloy. The critical concentration of Cr or Al needed for the formation of external Cr_2O_3 or Al_2O_3 scales was reduced due to the interaction of Cr and Al in Ni-Cr alloys.
出处
《材料与冶金学报》
CAS
2004年第4期313-316,共4页
Journal of Materials and Metallurgy
基金
沈阳市科技计划项目(No 1022041-1-03).
