CAJ | 학술논문

在氩气气氛下,采用扩散偶法研究了1323~1473 K下的Fe2 O3-TiO2体系的固相反应.使用电子探针对扩散偶的微观形貌进行观察,并对Fe、Ti离子的扩散摩尔分数曲线进行定量分析.动力学分析表明,氩气下体系的固相反应受铁、钛和氧离子的扩散控制.用Boltzmann-Matano法计算了体系的互扩散系数,其数量级在10-13~10-10 cm2·s-1范围内,并随着温度和Ti离子摩尔分数的增大而升高.氩气气氛下体系的扩散活化能约为356.06 kJ·mol-1,远比空气下的大,表明外界气氛中氧分压对体系的反应机理有重要影响.
재아기기분하,채용확산우법연구료1323~1473 K하적Fe2 O3-TiO2체계적고상반응.사용전자탐침대확산우적미관형모진행관찰,병대Fe、Ti리자적확산마이분수곡선진행정량분석.동역학분석표명,아기하체계적고상반응수철、태화양리자적확산공제.용Boltzmann-Matano법계산료체계적호확산계수,기수량급재10-13~10-10 cm2·s-1범위내,병수착온도화Ti리자마이분수적증대이승고.아기기분하체계적확산활화능약위356.06 kJ·mol-1,원비공기하적대,표명외계기분중양분압대체계적반응궤리유중요영향.
ABSTRACT The diffusion couple method was used to study the solid-state reaction of the Fe2 O3-TiO2 system in the temperature range of 1323 K to 1473 K in argon. The microstructure of the diffusion couple and the diffusion concentration profiles of Fe and Ti were determined by electron probe microanalysis ( EPMA) . According to kinetic analysis, this solid-state reaction is controlled by the diffu-sion of Fe, Ti and O ions. The inter-diffusion coefficient, which increases with the increasing temperature and concentration of Ti ions, was calculated by the Boltzmann-Matano method, and its order of magnitude is in the range of 10 -13 to 10 -10 cm2·s-1 . The diffusion activation energy ( about 356.06 kJ·mol-1 ) of the system in argon is much bigger than that in air, which indicates that the partial pres-sure of oxygen in atmosphere has important effect on the reaction mechanism of the system.