摘要
采用扩散偶法研究了1323~1473 K下FexO-Ti O2体系的固相反应,反应过程中氧分压由一定比例的CO-CO2混合气体控制.扩散偶截面的微观形貌用电子探针进行观察,并对Fe2＋、Ti4＋和O2-离子的扩散浓度轮廓进行定量分析.结合Fe O-Ti O2体系相图确定了固相反应中有钛铁晶石、钛铁矿和假铁板钛矿相生成,且它们的生长受扩散控制.依据扩散组元的摩尔分数变化绘制了铁离子的扩散路径图,并在此基础上描述了该体系的固相反应机理.
The diffusion couple was used to study solid state reaction in the FexO- Ti O2 system at a temperature range of 1323 to1473 K,during which the oxygen partial pressure was controlled by CO- CO2 gas mixture. The cross-sections of the diffusion couple were observed by electron probe microanalysis（ EPMA）,and the diffusion concentration profiles of Fe2 ＋,Ti4 ＋,and O2-ions were also determined. In combination with the phase diagram of the Fe O-Ti O2 system,it was found that ulvospinel,ilmenite,pseudobrookite phases formed during the reaction and their growth was diffusion-controlled. According to the concentration changes of diffusion ions,the diffusion path of Fe ions was plotted,based on which the solid state reaction mechanism of this system was reasonably proposed.
出处
《工程科学学报》
EI
CAS
CSCD
北大核心
2015年第7期867-872,共6页
Chinese Journal of Engineering
基金
国家自然科学基金重大研究项目(51090384)
关键词
铁氧化物
二氧化钛
固相反应
反应机理
扩散控制
iron oxides
titanium dioxide
solid state reaction
reaction mechanism
diffusion control
