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Title
Japanese: 
English:Preparation and Properties of Al2O3/Ni Composite from NiAl2O4 spinel by In-situ Reaction Sintering Method 
Author
Japanese: 磯部敏宏, 大門啓志, 伊藤 和則, 松原 孝至, 引地 康夫, 太田敏孝.  
English: Toshihiro ISOBE, Keiji Daimon, Kazunori Ito, Takashi Matsubara, Yasuo Hikichi, Toshitaka Ota.  
Language English 
Journal/Book name
Japanese: 
English:Ceramics International 
Volume, Number, Page Vol. 33    No. 7    Page 1211–1215
Published date July 2007 
Publisher
Japanese: 
English:Elsevier 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1016/j.ceramint.2006.03.027
Abstract Al2O3/Ni nano composites were prepared from NiAl2O4 spinel by in situ reaction sintering method. The starting materials of Al2O3–NiOpowder were synthesized by thermal decomposition of precipitates prepared from aluminum sulfate and nickel sulfate. The specific surface area ofthe Al2O3–NiO powder was >36 m2/g. The Al2O3/Ni composites were obtained by firing the starting material buried in a carbon bed at 1500 8C for1 h. The resulting Al2O3/Ni composites have relative densities >96% (0–40 mol% Ni). Nickel grains dispersed homogeneously in themicrostructure, accounting for 10% of within the grains and 90% at grain boundaries. The average particle size of the former nickel grainswas 150 nm while that of the latter grains was 300 nm. The maximum three-point bending strength was 408 MPa at 10 mol% Ni sample and themaximum fracture toughness was 9.9 MPa m1/2 at 40 mol% Ni sample. The Vickers hardness decreased slightly with increasing Ni content and thischange is in good agreement with individual mixture rule.

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