Gelcasting process of Al2O3/Ni nanocomposites

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

doi:10.1016/S0167-577X(03)00397-5

Gelcasting process of Al₂O₃/Ni nanocomposites

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

Institute of Multidisciplinary Research for Advanced Materials (IMRAM)

Research output: Contribution to journal › Article

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 language	English
Pages (from-to)	17-20
Number of pages	4
Journal	Materials Letters
Volume	58
Issue number	1-2
DOIs	https://doi.org/10.1016/S0167-577X(03)00397-5
Publication status	Published - 2004 Jan 1

Keywords

Colloidal
Ferromagnetism
Gelcasting
Nanocomposites

ASJC Scopus subject areas

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

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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

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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.",

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AU - Kim, B. S.

AU - Sekino, T.

AU - Yamamoto, Y.

AU - Nakayama, T.

AU - Kusunose, T.

AU - Wada, M.

AU - Niihara, K.

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N2 - 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.

AB - 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.

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