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http://dx.doi.org/10.4191/KCERS.2002.39.8.769

Fabrication of Al2O3/Fe-Ni Nanocomposites by Pressureless Sintering and their Magnetic Properties  

Lee, Hong-Jae (Korea Institute of Ceramic Engineering and Technology)
Jeong, Young-Keun (Korea Institute of Ceramic Engineering and Technology)
NamKung, Seok (Department of Metallurgy and Materials Science, Hanyang University)
Oh, Sung-Tag (Department of Metallurgy and Materials Science, Hanyang University)
Lee, Jai-Sung (Department of Metallurgy and Materials Science, Hanyang University)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.8, 2002 , pp. 769-774 More about this Journal
Abstract
The powder mixture in which Fe-Ni alloy particles of 20 nm were homogeneously dispersed on $Al_2O_3$ particle surfaces was prepared by hydrogen reduction of $Al_2O_3$ and metal oxide powders. $Al_2O_3$/Fe-Ni nanocomposites fabricated by pressureless sintering were only composed of $Al_2O_3$ and ${gamma}$-Fe-Ni phases and achieved over 98% of the theoretical density at the sintering temperature above $1350^{\circ}C$. The highest strength and toughness of the composites were 574 MPa and 3.9 MP$a{\cdot}m1/2$, respectively. These values were about 20% higher than these of monolithic $Al_2O_3$ sintered at the same conditions. Nanocomposites showed ferromagnetic properties and coercive force was increased with decrease of the average particle size of dispersions.
Keywords
Nanocomposites; Pressureless sintering; Microstructure; Mechanical property; Magnetic property;
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Times Cited By KSCI : 1  (Citation Analysis)
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