Preparation of polymer composites containing hollow magnetic particles and measurement of their electromagnetic properties

중공 자성입자를 포함한 복합재료 제조 및 전자파 특성 측정

  • 이진우 (한국기계연구원 부설 재료연구소 융합공정연구부 복합재료연구그룹) ;
  • 이상복 (한국기계연구원 부설 재료연구소 융합공정연구부 복합재료연구그룹) ;
  • 김진봉 (한국기계연구원 부설 재료연구소 융합공정연구부 복합재료연구그룹) ;
  • 이상관 (한국기계연구원 부설 재료연구소 융합공정연구부 복합재료연구그룹) ;
  • 박기연 (한국과학기술원 기계항공시스템학부 항공우주공학 대학원)
  • Published : 2008.04.30

Abstract

In order to design light weight and high efficient electromagnetic wave absorbing materials, hollow magnetic particles have been introduced in this study. The electroless plating method has been utilized to coat Ni and Fe on the substrates of synthesized polystyrene particles of submicron size. Removing polystyrene particles by heat treatment resulted in hollow structures. Observation by SEM, TEM and EDS confirmed the surface morphology and coating thickness of Ni and Fe. Polymeric composites containing hollow particles were tested in order to compare the electromagnetic properties between Ni coated and Fe costed particles. The composite of 30 wt% Fe hollow particles showed the higher complex permeability than Ni hollow particles or the conventional barium ferrite particles.

자성 금속 코팅을 위해 폴리스티렌 submicron 입자를 제조하였다. 니켈과 철 코팅을 위해 무전해 도금을 적용하였고 열처리를 통해 폴리스티렌을 탄화 시켜 중공형 구조를 형성하였다. 이러한 중공형 자성 입자는 가볍고 효율이 우수한 전자파 흡수체 제조에 적용될 수 있다. 코팅 층의 두께, 성분 및 표면 형상은 SEM/EDS/TEM 으로 관찰하였고, 중공 자성 입자의 전자파 특성 비교를 위해 고분자 복합재료를 제조하였다. 복합재료의 투자율 측정 결과, 중공형 철이 니켈에 비해 우수하였으며 바륨 페라이트 (Barium ferrite)와 같은 기존의 자성 재료보다 우수하였다.

Keywords

References

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