酸化鉄のシンタリングについて
1967 年 83 巻 949 号 p. 755-758
詳細
1967 年 83 巻 949 号 p. 755-758
The sintering process of artificial magnetite, hematite, and wiistite has been investigated by means of measurements of the linear shrinkage versus sintering time at various temperatures.
Although Kingery's equation derived from a model of bulk diffusion is applied in the case of hematite, it doesn't hold in the case of magnetite and wustite.
The experimental value of activation energy for sintering of hematite is 114kcal/mol, and shows agood agreement with that for self diffusion of Fe ion. On the other hand, the values of activation energyfor sintering of magnetite and wostite are 150kcal/mol, which is much larger than those for self diffusionof Fe ion in the materials.
From these experimental results, it seems that the rate controlling factor in sintering is the diffusionof less diffusible species in the constituent ions of iron oxide. In other words, the rate of sintering iscontrolled by the diffusion of Fe ion in the case of hematite, and by the diffusion of O ion in the case ofmagnetite and wustite respectively.
