ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Solid-state Reaction Studies in Al2O3–TiO2 System by Diffusion Couple Method
Jianchao ZhengXiaojun HuZhongshan RenXiangxin XueKuochih Chou
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2017 Volume 57 Issue 10 Pages 1762-1766

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Abstract

In order to study the formation mechanism of Al2TiO5, the solid-state inter-reaction between Al2O3 and TiO2 under Ar atmosphere was investigated in the temperatures range from 1723 to 1873 K by the diffusion couple method. The phase of the inter-compound and the change of the concentration of Ti across the diffusion layers were confirmed by the electron probe microanalysis (EPMA). Based on the concentration profile of Ti element, the thickness of diffusion layers was obtained and the interdiffusion coefficients which were affected by temperature and concentration of Ti were calculated by the Wagner method. The experimental results indicate that the thickness of diffusion layers increases with the diffusion time. The magnitudes of interdiffusion coefficients were in the range of 10−10~10−12 cm2/s and the range of diffusion activity energy ED was from 266.77 kJ/mol to 309.96 kJ/mol.

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© 2017 by The Iron and Steel Institute of Japan
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