Products of carbothermic reduction of Fe-Cr-O and Fe-Cr-Ni-O systems  

Fe-Cr-O和Fe-Cr-Ni-O体系中C还原产物(英文)

作　　者：张延玲[1] 刘洋[1] 魏文洁[1] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第4期1210-1219,共10页中国有色金属学报（英文版）

基　　金：Project (51074025) supported by the National Natural Science Foundation of China;Project (FRF-SD-12-009A) supported by the Fundamental Research Funds for the Central Universities,China

摘　　要：The reduction behaviors and characteristics of products of the Fe-Cr-O system （FeCr2O4 and Fe2O3＋Cr2O3） and Fe-Cr-Ni-O system （Fe2O3＋Cr2O3＋NiO） under various conditions were studied. The results show that more Fe-Cr or Fe-Cr-Ni solution and less residual carbon content were obtained at higher temperatures and lower initial molar ratio of C to O （nC：nO）. The degree of reduction was highly dependent on both time and temperature, and the residual carbon content greatly increased with increasing nC：nO at each temperature. The products generated during the carbothermic reduction of the Fe-Cr-O system were examined using X-ray diffraction （XRD）. A scanning electron microscope （SEM） coupled with energy dispersive spectrometer was used to observe the microstructure and the distribution of elements in the various phases of the final reduction products of the Fe-Cr-O and Fe-Cr-Ni-O.研究不同条件下C还原Fe-Cr-O体系(FeCr2O4和Fe2O3+Cr2O3)及Fe-Cr-Ni-O体系(Fe2O3+Cr2O3+NiO)的还原行为及产物特性。结果表明:温度与碳氧比对C还原Fe-Cr-O和Fe-Cr-Ni-O体系所得产物的组成有很大的影响,在较高温度和较低碳氧比的条件下,产物中残余碳含量更少且Fe-Cr和Fe-Cr-Ni合金含量更多;样品的还原率在很大程度上取决于还原时间和温度,在不同温度条件下,产物中的残余碳含量均随着碳氧比的增加而升高。此外,对不同时间条件下C还原Fe-Cr-O体系所得产物进行XRD分析,利用SEM和EDS研究C还原Fe-Cr-O和Fe-Cr-Ni-O体系所得最终产物中不同相的微观形貌和元素分布。

关 键 词：Fe-Cr-O system Fe-Cr-Ni-O system reduction product element distribution residual carbon content 

分 类 号：TF764.1[冶金工程—钢铁冶金]