A wet-chemical process yielding reactive magnesium aluminate spinel (MgAl2O4) powder

J. G. Li, T. Ikegami, J. H. Lee, T. Mori, Y. Yajima

Research output: Contribution to journalArticle

97 Citations (Scopus)

Abstract

Ammonium carbonate was used as the precipitant to synthesize Mg-Al spinel precursors from a mixed solution of magnesium and aluminum nitrates. The precursor, composed of crystalline ammonium dawsonite hydrate [NH4Al(OH)2CO3·H2O] and hydrotalcite [Mg6Al2(CO3)(OH)16· 4H2O] phases, transformed to pure spinel at ∼900°C via the decomposition of hydrotalcite at ∼400-800°C and a solid-state reaction between MgO (decomposed from hydrotalcite) and γ-Al2O3 (derived from NH4Al(OH)2CO3·H2O) at ∼800-900°C. Sinterability of the resultant spinel powders was evaluated by the constant-rate-of-heating sintering method. The effect of calcination temperature on particle morphology and sinterability of the resultant spinel powders was investigated. Spinel ceramics of ∼99% dense were produced by vacuum sintering at 1550°C for 2 h from the powder calcined at 1100°C for 2 h.

Original languageEnglish
Pages (from-to)481-489
Number of pages9
JournalCeramics International
Volume27
Issue number4
DOIs
Publication statusPublished - 2001
Externally publishedYes

Keywords

  • A. Sintering
  • Ammonium carbonate
  • Chemical synthesis
  • Mg-Al spinel

ASJC Scopus subject areas

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

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