Abstract
Al 2O 3/Ni nanocomposites were fabricated by gelcasting an Al 2O 3/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 Al 2O 3/NiO green body comprised Al 2O 3 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 Al 2O 3 matrix. Near-net shaping and sintering for the Al 2O 3/Ni nanocomposite were also achieved by present gelcasting, indicating applicability of this process for industrial use.
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