Reduction and Sintering of a Nickel-Dispersed-Alumina Composite and Its Properties

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 dispersio...

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Published inJournal of the American Ceramic Society Vol. 80; no. 5; pp. 1139 - 1148
Main Authors Sekino, Tohru, Nakajima, Toshio, Ueda, Satoru, Niihara, Koichi
Format Journal Article
LanguageEnglish
Published Westerville, Ohio American Ceramics Society 01.05.1997
Blackwell
Subjects
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Structural ceramics
Technical ceramics
Phase composition
Nickel Oxides
Mechanical properties
Dispersion reinforced material
Nanostructure
Metal
Hardness
Experimental study
Oxide ceramics
Composite material
Structural ceramic
Fracture toughness
Chemical reduction
Hot pressing
Sintering
Nickel
Manufacturing
Microstructure
Rupture strength
Alumina
Magnetic properties
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Summary: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.
Bibliography:ark:/67375/WNG-MTHJ7V3H-4
ArticleID:JACE1139
istex:BC40F314791908DF1BEA3E5DDE4E46A83386DB27
C. G. Pantano—contributing editor
Supported by the Ministry of Education, Science and Culture under a Grant‐in‐Aid for Scientific Research (Nos. 05303005 and 05750749) and partly by the cooperative project “Advanced Materials Creation on Their Limit State Prediction” between ISIR and Welding Research Institute at Osaka University.
Member, American Ceramic Society.
Present address: Electric Devices and Material Division, Asahi Glass Co., Ltd., Hyogo 676, Japan.
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ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1997.tb02956.x