Aging effects on the characteristics and sintering behavior of coprecipitated Al2O3ZrO2 powders

Chih Cheng Chen, Fu Su Yen, Chi-Yuen Huang

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Effect of gel aging on the characteristics of zirconia-toughened alumina (ZTA) composites were investigated. The composite powders were prepared by coprecipitation processes using a mixed solution of aluminum nitrate and zirconium oxynitrate. The coprecipitates were aged in an aqueous solution of pH 9 at room temperature. The occurrence of either intra- or intergranular ZrO2 particles in the Al2O3 matrix depended on the aging condition, which also affected the content of tetragonal ZrO2 (t-ZrO2). Aging treatment decreased the amount of intragranular ZrO2, as well as the agglomerate strength of calcined powders, both of which seemed to improve the sintered densities of ZTA ceramic bodies. Through suitable aging processes, sintered ZTA specimens with relative density >99% and intergranular ZrO2 particles were fabricated.

Original languageEnglish
Pages (from-to)379-384
Number of pages6
JournalCeramics International
Volume20
Issue number6
DOIs
Publication statusPublished - 1994 Jan 1

Fingerprint

Powders
Aluminum Oxide
Sintering
Aging of materials
Zirconia
Alumina
Composite materials
Coprecipitation
Zirconium
Nitrates
Gels
Aluminum
zirconium oxide
Temperature

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "Effect of gel aging on the characteristics of zirconia-toughened alumina (ZTA) composites were investigated. The composite powders were prepared by coprecipitation processes using a mixed solution of aluminum nitrate and zirconium oxynitrate. The coprecipitates were aged in an aqueous solution of pH 9 at room temperature. The occurrence of either intra- or intergranular ZrO2 particles in the Al2O3 matrix depended on the aging condition, which also affected the content of tetragonal ZrO2 (t-ZrO2). Aging treatment decreased the amount of intragranular ZrO2, as well as the agglomerate strength of calcined powders, both of which seemed to improve the sintered densities of ZTA ceramic bodies. Through suitable aging processes, sintered ZTA specimens with relative density >99{\%} and intergranular ZrO2 particles were fabricated.",
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Aging effects on the characteristics and sintering behavior of coprecipitated Al2O3ZrO2 powders. / Chen, Chih Cheng; Yen, Fu Su; Huang, Chi-Yuen.

In: Ceramics International, Vol. 20, No. 6, 01.01.1994, p. 379-384.

Research output: Contribution to journalArticle

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