熔融酸化鉄中へのアルミナの溶解速度

概要

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The rate of dissolution of polycrystalline alumina in molten iron oxide at 1500°C was studied under conditions of free and forced convection by rotating cylindrical alumina specimens in a stationary crucible containing the melt.Alumina specimen was about 19.4mm in diameter and 30mm long of about 18 percent apparent porosity.The specimens were rotated for 1-15min at speeds from 0 to 700rpm in the melt.Then, the dissolution rates in molten iron oxide from 1400°C to 1600°C were studied at 100rpm.The dissolution rate was calculated with the change of radius of alumina specimens.The dissolution rate was proportional to U0.69, where U is the speed of rotation of specimen, and it was dependent on temperature of the melt.Activation energy for the dissolution was about 55kcal per mol.The interdiffusion coefficient was estimated to be about 1.4×10-5-2.1×10-5 square cm per sec at 1400-1500°C.Therefore, we obtained the findings that the process of dissolution of alumina in molten iron oxide within the range of this investigation is controlled by diffusion of aluminium ion in the liquid boundary layer.
社団法人日本セラミックス協会の論文
1975-02-01