【摘要】 通过增重法研究了新型奥氏体耐热钢NH4在700、900℃和1 000℃空气中的抗高温氧化性能。结果表明,NH4钢在700、900℃和1 000℃时的平均氧化速率分别为:0.064 g/(m2.h)、0.083 g/(m2.h)和0.278 6g/(m2.h)。在700℃和900℃时的氧化层是由外层的Cr2O3和内层的SiO2、Al2O3组成,在1 000℃时是由Cr、Si和Al 3种元素的混合氧化物组成。更多还原

【Abstract】 The high-temperature oxidation resistance of new austenitic stainless steel NH4 in air over the temperature range of 700-1 000 ℃ was studied by using the way of gain weight.Experimental results indicate that the average oxidation rate of NH4 are 0.064 g/(m2·h) at 700 ℃,0.083 g/(m2·h) at 900 ℃ and 0.278 6 g/(m2·h) at 1 000 ℃ respectively.The compositions of oxide include outer Cr2O3 film and inner SiO2 film at 700 ℃ and 900 ℃.While at 1 000 ℃ the oxide layer is a mixture of Cr2O3,SiO2 and Al2O3.更多还原