Solid-state synthesis and formation mechanism of barium hexaaluminate from mechanically activated Al2O3-BaCO3 powder mixtures

Sri Nugroho, Zhong Chun Chen, Akira Kawasaki, M. O.D. Jarligo

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The synthesis and formation mechanism of barium hexaaluminate compound (Ba-β-Al2O3) by solid-state reactions between powdered reactants of alumina (Al2O3) and barium carbonate (BaCO3) have been investigated. The processes for synthesizing Ba-β-Al2O3 phase include mechanically activated milling of Al2O3-BaCO3 powder mixtures and subsequent solid-state reactions at high temperatures. The mechanically activated milling results in a significant decrease in the decomposition temperature of BaCO3, hence promotes its reactions with Al 2O3. Almost monophasic Ba-β-Al2O 3 can be synthesized by 9-12 h ball milling, followed by heat treatment at 1500 °C for 2 h. The formation of Ba-β-Al 2O3 phase includes three stages: (i) decomposition of BaCO3, (ii) formation and growth of spherical BaO·Al 2O3 particles, and (iii) reaction between Al 2O3 and BaO·Al2O3 to form Ba-β-Al2O3 with an elongated morphology.

Original languageEnglish
Pages (from-to)466-471
Number of pages6
JournalJournal of Alloys and Compounds
Volume502
Issue number2
DOIs
Publication statusPublished - 2010 Jul 23

Keywords

  • Ba-β-AlO
  • High-energy planetary ball milling
  • Mechanical activation
  • Oxide materials
  • Solid-state synthesis
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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