Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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A Study on Addition of Rare Earth Element in the Spent Permanent Magnet Scrap to Gray Cast Iron

회주철에서의 폐 영구자석 스크랩을 활용한 희토류 원소 첨가 영향 연구

  • Park, Seung-Yeon (Korea Institute of Rare Metals, Korea Institute of Industrial Technology) ;
  • Noh, Jung-Hyun (Korea Institute of Rare Metals, Korea Institute of Industrial Technology) ;
  • Kim, Hyo-jung (Korea Institute of Rare Metals, Korea Institute of Industrial Technology) ;
  • Lim, Kyoung-Mook (Korea Institute of Rare Metals, Korea Institute of Industrial Technology)
  • 박승연 (한국생산기술연구원 희소금속산업기술센터) ;
  • 노정현 (한국생산기술연구원 희소금속산업기술센터) ;
  • 김효중 (한국생산기술연구원 희소금속산업기술센터) ;
  • 임경묵 (한국생산기술연구원 희소금속산업기술센터)
  • Received : 2018.04.03
  • Accepted : 2018.06.11
  • Published : 2018.06.30
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Abstract

In this study, we developed a method for manufacturing high strength gray cast irons by adding a rare earth element (R.E.) included in a spent permanent magnet scrap to gray cast irons. The improvement of the mechanical properties of gray cast irons is attributed to A-type graphite formation promoted by complex sulfide, which was formed by R.E. in the spent magnets during a solidification process. The cast specimen inoculated by R.E. in the spent magnet scrap showed excellent tensile strength up to 306 MPa, and is similar to that of the specimen inoculated by expensive misch-metal. In this regards, we concluded that the cheap spent magnets scrap is a very efficient inoculation agent in fabrication of high performance gray cast irons.

본 연구에서는 폐 영구자석 스크랩에 함유된 희토류원소(Rare Earth Element, R.E.)를 첨가하여 고강도 회주철의 제조 방법을 검토하였다. 폐 영구자석 스크랩에 함유되어있는 희토류원소가 회주철의 응고 시 복합유화물 및 A형 흑연 형성을 촉진하여 조직 및 기계적 특성 향상에 효과적으로 작용한 것으로 나타났다. 폐 영구자석 스크랩을 접종제로 활용하여 주조 시 인장강도는 306 MPa의 우수한 특성으로 나타났으며, 고가의 희토류원소를 사용하여 접종한 실험의 인장강도와 비슷한 수준의 특성이다. 연구결과를 토대로 고특성의 회주철 제조에 있어서 폐 영구자석 스크랩을 활용한 R.E. 첨가가 효과적인 접종방안임을 확인하였다.

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References

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