摘要
对淤泥沙原料中Fe3O4及其中间产物Fe O和Fe可能参与的反应进行了热力学分析.结合绘制的不同CO分压下Fe-Si体系在C和Si O2过量下的优势区相图及Fe-O-N体系热力学参数状态图,得出体系中Fe元素最终以Fe3Si形式存在,为淤泥沙合成O'-Sialon-Si C-Fe3Si(即Fe-Sialon)复合材料提供了热力学理论依据.在热力学分析的基础上,以淤泥沙为主要原料,采用碳热还原氮化法制备了Fe-Sialon复合材料,并借助X射线衍射仪和扫描电子显微镜对烧结体的物相和显微形貌进行了表征,得出产物的主晶相为O'-Sialon,还含有少量的Si C和Fe3Si相,晶粒呈现为纤维状、絮状或短柱状,与热力学分析结果(Fe元素最终以Fe3Si存在)吻合.
A thermodynamic analysis was performed on possible reactions of Fe304 in sediment material, intermediate product FeO, Fe, and other matters. In combination with the predominant area phase diagram of the Fe-Si system under different carbon mon- oxide partial pressures and excess carbon and silicon dioxide as well as the thermodynamic parameter state diagram of the Fe-O-N system, it is found that Fe finally exists in the form of Fe3 Si, which provides a thermodynamic theoretical basis for using sediment to synthesize O＇-Sialon-SiC-Fe3Si （Fe-Sialon） composites. These Fe-Sialon matrix composites made from sediment were prepared by carbothermal reduction- nitridation on the basis of thermodynamic analysis. X-ray diffraction and scanning electron microscopy resuhs in- dicate that plentiful O＇-Sialon phase and a small quantity of SiC and Fe3 Si phases appear in samples, and the crystalline grains are fi- ber-, cotton-, or short column-shaped, which is consistent with thermodynamic analysis results.
出处
《工程科学学报》
EI
CAS
CSCD
北大核心
2015年第2期219-224,共6页
Chinese Journal of Engineering
基金
国家科技支撑计划资助项目(2011BAB03B05)
住房和城乡建设部科学技术计划资助项目(2013-K4-8)
辽宁省教育厅科技研究项目(L2011078)
关键词
复合材料
铁
SIALON
热力学分析
碳热还原
氮化
实验验证
composite materials
iron
Sialon
thermodynamic analysis
carbothermal reduction
nitridation
experimental confirmation
