Colloidal processing for fine particles of Al 2 O 3 -15 vol% ZrO 2 system

Tohru Suzuki, Yoshio Sakka, Keijiro Hiraga

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12 Citations (Scopus)

Abstract

Al 2 O 3 -15vol%ZrO 2 composites were produced by colloidal process. Dispersed suspensions consisting of α-Al 2 O 3 and ZrO 2 fine powders were prepared by adjusting the pH value and salt concentration, or adding appropriate amounts of polyelectrolyte. The dispersion of powder particles was characterized by Theological measurement. In multicomponent particle systems, long range particle segregation occurs due to different particle size and specific gravity. The segregation decreases with increasing the salt concentration and/or solid content in the suspensions. The suspensions were consolidated by slip casting and cold isostatic pressing (CIP). They were sintered at temperatures from 1573K to 1793K for 2h in air. The microstmctures were observed by SEM. For the specimen sintered at 1673K, the density was more than 98% and the grain size of AljOj matrix was 0.42nm. At 1723K, the density was about 99.5% and the grain size was 0.59-0.70μm.

Original languageEnglish
Pages (from-to)356-361
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume44
Issue number4
DOIs
Publication statusPublished - 1997 Jan 1
Externally publishedYes

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Keywords

  • Fine powder
  • Rheology
  • Slip cast

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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