Alumina ceramics based on seeded boehmite and electrophoretic deposition


Boccaccini A., Kaya C.

CERAMICS INTERNATIONAL, vol.28, no.8, pp.893-897, 2002 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 28 Issue: 8
  • Publication Date: 2002
  • Doi Number: 10.1016/s0272-8842(02)00070-6
  • Title of Journal : CERAMICS INTERNATIONAL
  • Page Numbers: pp.893-897
  • Keywords: alumina, boehmite, electrophoretic deposition, seeding, ALPHA-ALUMINA, GAMMA-AL2O3 POWDERS, SOL-GEL, TRANSFORMATION, COMPOSITES, DENSIFICATION, FABRICATION

Abstract

It is shown that seeding a commercial boehmite sol with crystallographically suitable seeds reduces both the crystallization temperature for the final alpha-Al(2)O(3) phase and the sintering densification temperature. The seeding component was a tailored combination of delta- and alpha-alumina particles in nanometre and micrometer ranges, respectively, dispersed in water. Electrophoretic deposition (EPD) provided a quick, simple and cost-effective processing route to prepare dense monolithic alumina ceramics from the seeded boehmite suspensions. EPD-formed green bodies could be sintered and densified at temperatures as low as 1250 degreesC for 2 h. (C) 2002 Elsevier Science Ltd and Techna S.r.l. All rights reserved.