钛精粉氧化过程中物相转变  

Phase transformation of titanium concentrate in the oxidation process

作　　者：司新国[1,2] 李传维[1] 鲁雄刚[1] 郭曙强[1] 丁伟中[1] 

机构地区：[1]上海大学上海市现代冶金与材料制备重点实验室,上海200072 [2]河北钢铁集团有限公司唐钢分公司,唐山063020

出　　处：《北京科技大学学报》2012年第4期378-382,共5页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(51074105);国家重点基础研究发展计划资助项目(2007CB613606);上海大学创新基金资助项目(A.16--0110--09--704)

摘　　要：采用热重分析和恒温实验法研究了攀枝花钛精粉氧化过程中相的存在形式及其转变规律.X射线衍射结果和微观形貌分析表明:温度低于500℃,钛精粉未发生氧化反应;600℃时产生Fe2Ti3O9和TiO2相,其和原相Fe2O3相衍射峰强度均随温度的升高而增强;900℃时,Fe2Ti3O9相完全转变为Fe2TiO5相,且随温度的升高,TiO2相和Fe2O3相衍射峰强度逐渐减弱;在整个氧化过程中存在四个化学反应,其与烧结作用相互关联,使得氧化产物表面形成较多孔隙,变得凹凸不平且疏松.The existence form and transformation pattern of phases in Panzhihua titanium concentrate during the oxidation process were studied by thermogravimetry,constant temperature tests,X-ray diffraction analysis and microstructure observations.The results show that the titanium concentrate is not oxidized by oxygen below 500 ℃.Fe2Ti3O9 and TiO2 phases start to form when the temperature is 600 ℃ and the diffraction peak intensities of Fe2Ti3O9,TiO2 and original phase Fe2O3 strengthen with the experimental temperature rising.When the temperature rises at 900 ℃,Fe2Ti3O9 is substituted by Fe2TiO5 and the diffraction peak intensities of TiO2 and Fe2O3 gradually weaken with the experimental temperature rising.Four chemical reactions concomitant with sintering effect occur in the oxidation process;they accelerate the formation of porosities and make the surface of oxidation products rough and loose.

关 键 词：钛精粉 氧化 相转变 热重分析 

分 类 号：TF124.5[冶金工程—粉末冶金]