日本金属学会誌

J. Japan Inst. Metals, Vol. 51, No. 11 (1987),
pp. 1018-1022

Interdiffusion in A12O3-Cr2O3 Quasi-binary System

Koji Atarashiya1, Ryukichi Nagasaki1 and Keizo Nishida2

1Metals Research Institute, Faculty of Engineering, Hokkaido University, Sapporo
2Emeritus Professor of Hokkaido University

Abstract:

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,


(Received 1987/5/25)

Keywords:

alumina, chromia, solid-state reaction, oxide solid solution, mutual diffusion coefficients, Matano-Boltzmann methoa, activation energy


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