Sintering of Al2O3-Cr2O3 powder prepared by sol-gel process

Motonari Fujita, Keisuke Inukai, Shinichi Sakida, Tokuro Nanba, Junji Ommyoji, Akira Yamaguchi, Yoshinari Miura

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The sol-gel method was applied to create Al2O 3-Cr2O3 ceramics using aluminum ethylacetoacetate diisopropylate and chromium (III) chloride hexahydrate as starting materials. In the calcination at 600-1200°C it was found that the grains of Cr2O3-rich solid solution grew when they were exposed to the surrounding Al2O3-rich amorphous particles. The composition of the powders obtained by the sol-gel process changed with calcining temperature. Cr2O3-rich solid solutions firstly crystallize at low temperature and the composition of the crystallites changes as the crystals grow and react with the surrounding Al2O 3-rich phases. The final sintered bodies fired under an Ar atmosphere showed higher relative densities as compared with those fired in air. A dense sintered body was not obtained when abnormal grains grew when calcining occurred.

Original languageEnglish
Pages (from-to)526-530
Number of pages5
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume56
Issue number6
DOIs
Publication statusPublished - Jun 2007

Keywords

  • AlO
  • CrO
  • Sitering
  • Sol-gel process
  • Solid solution

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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