Titania Coating of Alumina Powders

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  • TAKAHASHI Yasutaka
    Department of Industrial Chemistry, Faculty of Engineering, Gifu University
  • CHISAKI Junji
    Department of Industrial Chemistry, Faculty of Engineering, Gifu University

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  • アルミナ粉末のチタニアコーティング
  • アルミナ フンマツ ノ チタニア コーティング

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Abstract

TiO2 deposition on alumina powders by the hydrolysis of titanium isopropoxide (TIP) was investigated as a model experiment of the uniform addition of a sintering aid. The rate of hydrolysis increased with increasing TIP/Al2O3 and H2O/TIP molar ratios, and titania deposition occurred effectively at the H2O/TIP ratio larger than 10. Examination of the coated powders by SEM, TEM, BET surface area measurement and electrophoresis showed that fine titania deposits adhered loosely to the alumina particles before calcination, but that after calcination at 500°C the deposits spread over the surface of the alumina particles, resulting in the tight coating. The hydrolysis reaction was accelerated by the addition of diethylamine (DEA); however the titania powders had a tendency to deposit separately from the alumina particles.

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