A Basic Study on the Production of $Sm_{2}Fe_{17}N_{x}$ System Rare Earth Permanent Magnet by the Reduction and Diffusion(I) - Production of Alloy Powder of $Sm_{2}Fe_{17}$ Intermetallic Compound -

환원.확산법에 의한 $Sm_{2}Fe_{17}N_{x}$ 계 희토류 영구자석의 제조에 관한 기초연구(제 1보) -$Sm_{2}Fe_{17}$금속간화합물 합금분말의 제조-

  • Song, Chang-Bin (Department of Materials Engineering, Kongju National University) ;
  • Choo, Tong-Rae (Department of Materials Engineering, Chungnam National University)
  • 송창빈 (공주대학교 공과대학 재료공학부) ;
  • 조통래 (충남대학교 공과대학 재료공학부)
  • Published : 1998.08.01

Abstract

As a basic study on the production of $Sm_{2}Fe_{17}N_{x}$ system rare earth permanent magnet by the reduction and diffusion(R- D) process, firstly the reduction reaction of $Sm_2O_3$ by metallic Ca and diffusion of Sm into Fe powder was investigated for the production the $Sm_{2}Fe_{17}$intermetallic compound. We concluded that the former case was very rapidly completed under the high temperature greater than 100$0^{\circ}C$ and the latter case of completion of diffusion reaction of Sm into the center of Fe powder(perfect homogenization condition) was required through 3h R- D reaction at 110$0^{\circ}C$ and identified as a rate determining step(RDS) on the whole reaction. Though $SmFe_2,SmFe_3$, and $Sm_{2}Fe_{17}$phases in the growth of phases of intermetallic compound in the Sm - Fe binary system were obseved below 100$0^{\circ}C$, but only $Sm_{2}Fe_{17}$phase was observed at lIOO$^{\circ}C$. Oxygen and Ca contents of the final sample in this work were 0.72wt% and O. 11 wt% respectively.

환원.확산법에 의해 $Sm_{2}Fe_{17}N_{x}$ 계 희토류 영구자석을 제조하기 위한 기초연구로서, 우선 $Sm_{2}Fe_{17}$ 금속간화합물의 제조를 위하여, 금속 Ca에 의한 $Sm_2O_3$의 환원반응과 Fe분말중에 Sm의 확산반응을 검토하였다. 그 결과 전자는 $1000^{\circ}C$이상의 고온의 경우에 매우 빠르게 완료되지만, 후자의 Fe분말의 중심까지 Sm의 확산반응의 완료(완전한 균질화조건)는 $1100^{\circ}C$에서 3h 정도의 R-D 반응이 필요하며, 이 확산반응이 전체반응에 있어서 율속단계임을 알았다. Sm-Fe 계의 금속간화합물들의 성장은$ 1000^{\circ}C$이하에서는 $SmFe_2$, $SmFe_3$,$Sm_{2}Fe_{17}$금속간화합물의 3개의 상이 관찰되었으나, $1100^{\circ}C$에서는 $Sm_{2}Fe_{17}$ 금속간화합물의 상만이 관찰되었다. 본 연구에서 얻어진 최종시료의 산소 및 Ca량은 각각 0.72wt% 및 0.11wt%이었다.

Keywords

References

  1. USP 3,748,193 v.24 Cech.R.E
  2. Presented at the 5th Interantional Workshop on Rare Earth-Cobalt Permanent Magnets and their Application Paper NO.X-i Li,D.;Liu,J.;Xu,E.
  3. Proc. 8th International Workshop on Rare Earth Permaenet Magnets and their Applications Herget,C
  4. 資源·素材學會誌 v.106 no.12 宋昌彬
  5. 資源·素材學會誌 v.106 no.14 田 晃生;務中達也;朝木善次郞
  6. Materials Trans. JIM v.31 no.6 Qi,G.;Hino,M.;Yazawa,Y.
  7. Proc. Int. Sympo. on Processing of Rare metals Tanabe,T.;Hirose,S;Asaki,Z.
  8. 資源·素材學會平成3年度春季大會講演槪要集 宋昌彬;小川 修
  9. 資源·素材學會誌 v.108 no.2 田 晃生;務中達也;朝木善次郞
  10. 資源·素材學會誌 v.108 no.2 安田淸隆;李自强;板垣 乙未生
  11. 資源·素材學會誌 v.108 no.5 宋昌彬;小川 修
  12. IEEE Trans. Magn v.28 no.5 T.Y.Liu;W.C.Chang;C.J.Chen;T.Y.Chu;C.D.Wu
  13. 資源·素材學會誌 v.110 no.14 宋昌彬;小川 修
  14. Journa of Magnetism and Magnetic Materials v.169 C.Burkhardt;M.Matzinger;M.Steinhorst;J.Fidler;I.R.Harris
  15. ASM v.1 Binary Allot Phase Diagrams Massalski,T.B.