Effects of Nd Addition to Sr Ferrite Bonded Magnet

Sr 페라이트 본드자석의 Nd 첨가효과

  • 정왕일 (명지대학교 공과대학 대학원 전자공학과) ;
  • 진성빈 (명지대학교 공과대학 대학원 전자공학과) ;
  • 강재덕 (명지대학교 공과대학 대학원 전자공학과) ;
  • 신용진 (명지대학교 공과대학 전기전자공학부)
  • Published : 1997.11.01

Abstract

In this paper, we deal with the effect on magnetic properties when Nd is added to Sr ferrite bonded magnet. First, we choose SrO$_{n}$.Fe$_2$O$_3$(n=5.9), which is nonstoichiomatric composition, as specimen ferrite. Then, we add 5wt% polyvinyl alcohol and calcinate at 12$25^{\circ}C$ under $N_2$ environment for carbon coating on chemical compound specimen. After that we obtain 1.2${\mu}{\textrm}{m}$ single domain powder through grinding process for 18 hours. The single domain Sr ferrite Powder is well mixed with silage coupling and calcium stearate of 1wt% Then, it is kneaded by using polyamide12 as a binder and is pelleted. After adding Nd-Fe-B powder to the pelleted specimen, we injection-mould it under magnetic field by using anisotropic mould. Especially, when we add l3wt% Nd-Fe-B powder to the polyamide12, we obtain excellent magnetic propertiecs which are $_{B}$H$_{C}$=2.65KOe, Br=3.16KG and (BH)$_{max}$=2.61MGOeOeOeOeOe

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