Diffusion coefficient of Ti4+ in calcium ferrite/calcium titanate diffusion couple
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第9期
论文作者：Wang Wei Hong-rui Yue Xiang-xin Xue
文章页码：1216 - 1225
摘 要：This study investigated the interdiffusion of calcium ferrite/calcium titanate system in the time range of 0–120 min by the diffusion couple method in a CO/N2 reducing atmosphere at 700℃. The results show that after the diffusion reaction occurred, no longitudinal agglomerations were present on the substrate surface on the calcium titanate side. When the diffusion time was increased to 105 min, a net vacancy flow from calcium titanate to calcium ferrite might have occurred, causing the surface of the calcium ferrite substrate to collapse. The thickness of the diffusion layer of the calcium ferrite/calcium titanate system was about 17–48 μm, which conforms to the parabolic law of diffusion. The diffusion coefficient and the Ti4+ concentration in the calcium ferrite/calcium titanate system are related. This shows an increase in the diffusion coefficient with the increase of Ti4+concentration, and the diffusion coefficient value was in the range of 10-12–10-11 cm2·s-1.
Wang Wei，Hong-rui Yue，Xiang-xin Xue
School of Metallurgy,Northeastern University
摘 要：This study investigated the interdiffusion of calcium ferrite/calcium titanate system in the time range of 0–120 min by the diffusion couple method in a CO/N2 reducing atmosphere at 700℃. The results show that after the diffusion reaction occurred, no longitudinal agglomerations were present on the substrate surface on the calcium titanate side. When the diffusion time was increased to 105 min, a net vacancy flow from calcium titanate to calcium ferrite might have occurred, causing the surface of the calcium ferrite substrate to collapse. The thickness of the diffusion layer of the calcium ferrite/calcium titanate system was about 17–48 μm, which conforms to the parabolic law of diffusion. The diffusion coefficient and the Ti4+ concentration in the calcium ferrite/calcium titanate system are related. This shows an increase in the diffusion coefficient with the increase of Ti4+concentration, and the diffusion coefficient value was in the range of 10-12–10-11 cm2·s-1.
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