| 상압소결에 의한 Al2O3/Fe-Ni 나노복합재료의 제조 및 자기적 특징 |
| 이홍재, 정영근, 남궁석1, 오승탁1, 이재성1 |
요업기술원 나노세라믹센터
1한양대학교 금속재료공학과 |
| Fabrication of Al2O3/Fe-Ni Nanocomposites by Pressureless Sintering and their Magnetic Properties |
| Hong-Jae Lee, Young-Keun Jeong, Seok NamKung1, Sung-Tag Oh1, Jai-Sung Lee1 |
Korea Institute of Ceramic Engineering and Technology
1Department of Metallurgy and Materials Science, Hanyang University |
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| ABSTRACT |
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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. |
| Key words:
Nanocomposites, Pressureless sintering, Microstructure, Mechanical property, Magnetic property |
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