ZG35Cr24Ni7SiN耐热钢不同温度下的氧化膜特征分析

Analysis on the Characteristice of Oxide Film of ZG35Cr24Ni7SiN Heat-resisting Steel at Different Temperatures

运用X射线衍射(XRD)和扫描电镜(SEM)等手段对900℃和1250℃下的ZG35Cr24Ni7SiN耐热钢的氧化膜进行了分析和研究。结果发现,ZG35Cr24Ni7SiN耐热钢900℃下的氧化膜在氧化初期只有一层,为Cr2O3膜,随着氧化时间的延长,其氧化膜分3层,外层为SiO2膜,中间层为Fe2O3膜,内层为Cr2O3膜,并且在Cr2O3膜与基材间存在着一个富镍层,由此具有非常好的抗氧化性。ZG35Cr24Ni7SiN耐热钢1250℃下的氧化膜在初期分两层,外层为Mn3O4/NiFe2O4膜,内层为Mn3O4/Cr2O3/SiO2膜。随着氧化时间的延长变成一层,为Cr2O3/Mn3O4膜,具有较好的抗氧化性。

Oxide films of ZG35Cr24Ni7SiN heat-resisting steel at 900 ℃ and 1 250 ℃ were analyzed and studied using XRD and SEM techniques.The results show that there is single Cr2O3 film of ZG35Cr24Ni7SiN heat-resisting steel at 900 ℃ at the early stage of oxidization.With increasing time,the oxide films develop into three layers,outer SiO2 film,interlayer Fe2O3 film,inner Cr2O3 film,and a Ni-rich layer exist between Cr2O3 film and substrate,which has excellet oxidation resistance.At 1 250 ℃ the oxide film of ZG35Cr24...