Koji Atarashiya1, Ryukichi Nagasaki1 and Keizo Nishida2
1Metals Research Institute, Faculty of Engineering, Hokkaido University, Sapporo
The mutual diffusion coefficients of the alumina-chromia system were determined at 1676 K to 1793 K in air. The diffusion couples, which were made of the single crystals of alurmna embedded in the powder of chromia, were annealed at each experimental temperature in an electric furnace. The chromia powder was sufficiently densified on the contact interface of alumina. After the diffusion annealing, the concentration-penetration curves along the diffusion direction were determined with the aid of EPMA analysis. The mutual diffusion coefficients were calculated by the Matano-Boltzmann method. The results can be represented by the equation,
alumina, chromia, solid-state reaction, oxide solid solution, mutual diffusion coefficients, Matano-Boltzmann methoa, activation energy
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