Reduction and sintering of a nickel-dispersed-alumina composite and its properties

Tohru Sekino, Toshio Nakajima, Satoru Ueda, Koichi Niihara

Research output: Contribution to journalArticlepeer-review

275 Citations (Scopus)

Abstract

High-density nickel-dispersed-alumina (Al2O3/nickel) composites with superior mechanical properties were obtained by the hydrogen reduction and the hot pressing of alumina-nickel oxide (Al2O3/NiO) mixed powders. The mixtures were prepared by using NiO or nickel nitrate (Ni(NO3)2·nH2O) as a dispersion source of nickel metal. Microstructural investigations of the composite fabricated using nitrate powder revealed that fine nickel particles, ∼100 nm in diameter, dispersed homogeneously at the matrix grain boundaries, forming the intergranular nanocomposite. High strength (>1 GPa) and high-temperature hardness were registered for the composite that contained a small amount of nickel dispersion. The ferromagnetic properties of nickel, such as high coercive force, were observed, because of the fine magnetic dispersions, which indicates a functional value of structural composites.

Original languageEnglish
Pages (from-to)1139-1148
Number of pages10
JournalJournal of the American Ceramic Society
Volume80
Issue number5
DOIs
Publication statusPublished - 1997 May

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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