TY - JOUR
T1 - Reduction and sintering of a nickel-dispersed-alumina composite and its properties
AU - Sekino, Tohru
AU - Nakajima, Toshio
AU - Ueda, Satoru
AU - Niihara, Koichi
PY - 1997/5
Y1 - 1997/5
N2 - 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.
AB - 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.
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U2 - 10.1111/j.1151-2916.1997.tb02956.x
DO - 10.1111/j.1151-2916.1997.tb02956.x
M3 - Article
AN - SCOPUS:0031139553
SN - 0002-7820
VL - 80
SP - 1139
EP - 1148
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 5
ER -