Gelcasting process of Al2O3/Ni nanocomposites

B. S. Kim, T. Sekino, Y. Yamamoto, T. Nakayama, T. Kusunose, M. Wada, K. Niihara

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Al2O3/Ni nanocomposites were fabricated by gelcasting an Al2O3/NiO mixture, followed by reduction-sintering process. Dispersant quantity was optimized at 1.75 wt.% with measurement of rheological behaviors to determine the best dispersion state of binary oxides colloidal suspension for casting. Hydrogen reduction of NiO in the shaped body was accomplished successfully through pore channels of debinded organic chemical volume. The reduced Al2O3/NiO green body comprised Al2O3 and Ni phases without a reacted phase. One-dimensional diametric shrinkage reached 21% after pressureless sintering treatment, while fairly high strength of 586 MPa was maintained. Dispersed Ni particles revealed typical ferromagnetic behavior in the Al2O3 matrix. Near-net shaping and sintering for the Al2O3/Ni nanocomposite were also achieved by present gelcasting, indicating applicability of this process for industrial use.

Original languageEnglish
Pages (from-to)17-20
Number of pages4
JournalMaterials Letters
Volume58
Issue number1-2
DOIs
Publication statusPublished - 2004 Jan 1

Keywords

  • Colloidal
  • Ferromagnetism
  • Gelcasting
  • Nanocomposites

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Gelcasting process of Al<sub>2</sub>O<sub>3</sub>/Ni nanocomposites'. Together they form a unique fingerprint.

  • Cite this

    Kim, B. S., Sekino, T., Yamamoto, Y., Nakayama, T., Kusunose, T., Wada, M., & Niihara, K. (2004). Gelcasting process of Al2O3/Ni nanocomposites. Materials Letters, 58(1-2), 17-20. https://doi.org/10.1016/S0167-577X(03)00397-5