Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Fabrication of Al2O3/Fe-Ni Nanocomposites by Pressureless Sintering and their Magnetic Properties

상압소결에 의한 Al2O3/Fe-Ni 나노복합재료의 제조 및 자기적 특징

  • 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)
  • 이홍재 (요업기술원 나노세라믹센터) ;
  • 정영근 (요업기술원 나노세라믹센터) ;
  • 남궁석 (한양대학교 금속재료공학과) ;
  • 오승탁 (한양대학교 금속재료공학과) ;
  • 이재성 (한양대학교 금속재료공학과)
  • Published : 2002.01.01
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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.

금속 산화물 상태으 혼합분말을 수소 환원하여 $Al_2O_3$ 분말 표면에 20 nm 크기의 Fe-Ni 합금이 균일하게 분산된 복합분말을 합성하였다. 상압소결을 이용하여 제조한 $Al_2O_3$/Fe-Ni 나노복합재료는 전 소결 온도 범위에서 단지 $Al_2O_3$와 ${gamma}$-Fe-Ni 상만으로 구성되어 있었고, $1350^{\circ}C$ 이상의 소결 온도에서 98% 이상의 치밀화를 이루었다. 최대 파괴강도와 파괴인성은 각각 574 MPa과 3.9 MP$a{\cdot}m1/2$로서 동일한 소결 조건의 순수 $Al_2O_3$ 보다 약 20% 증가하였다. 나노복합재료는 강자성 거동을 보였으며 분산상의 평균 입자 크기가 감소함에 따라 증가된 보자력 값을 나타내었다.

Keywords

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