Two-step sintering of fine alumina-zirconia ceramics

Chih Jen Wang, Chi Yuen Huang, Yu Chun Wu

Research output: Contribution to journalArticlepeer-review

105 Citations (Scopus)

Abstract

This work investigates the feasibility to the fabrication of high density of fine alumina-5 wt.% zirconia ceramics by two-step sintering process. First step is carried out by constant-heating-rate (CHR) sintering in order to obtain an initial high density and a second step is held at a lower temperature by isothermal sintering aiming to increase the density without obvious grain growth. Experiments are conducted to determine the appropriate temperatures for each step. The temperature range between 1400 and 1450 °C is effective for the first step sintering (T1) due to its highest densification rate. The isothermal sintering is then carried out at 1350-1400 °C (T2) for various hours in order to avoid the surface diffusion and improve the density at the same time. The content of zirconia provides a pinning effect to the grain growth of alumina. A high ceramic density over 99% with small alumina size controlled in submicron level (0.62-0.88 μm) is achieved.

Original languageEnglish
Pages (from-to)1467-1472
Number of pages6
JournalCeramics International
Volume35
Issue number4
DOIs
Publication statusPublished - 2009 May

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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