Skip to main content
SpringerLink
Log in

Phase Equilibria in Fe-Nd-B and Related Systems and Microstructure of Sintered Fe-Nd-B Magnets

  • Chapter
Concerted European Action on Magnets (CEAM)

Abstract

Phase relations in the systems Fe-Nd, Fe-Nd-B, Fe-Nd-O, Fe-Dy-B, Fe-Tb-B and Fe-Nd-Dy(Tb)-B were investigated. The knowledge of these phase relations is used for a better understanding and an enhancement of the microstructure of the Fe-Nd-B-based sintered magnets. The important microstructural parameters: phase distribution, grain-size distribution, contiguity, porosity and microstructure of the intergranular regions and their influence on the coercivity were investigated. The effect of additions like Al and oxides (e.g. A1203) was determined. Al stabilizes an additional phase and improves the wetting behaviour between the Nd-rich liquid and Φ.

This is a preview of subscription content, log in via an institution to check access.

Access this chapter

Log in via an institution
eBook
USD 16.99
Price excludes VAT (USA)
  • Available as PDF
  • Read on any device
  • Instant download
  • Own it forever
Softcover Book
USD 54.99
Price excludes VAT (USA)
  • Compact, lightweight edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info

Tax calculation will be finalised at checkout

Purchases are for personal use only

Institutional subscriptions

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. G.P. Espinosa, “Crystal Chemical Study of the Rare-Earth Iron Garnets”, J. Chem. Phys. 37 (1962) 2344–2347

    Article  CAS  Google Scholar 

  2. V.F. Terekhova, E.V. Maslova, Y.M. Savitskiy, “Iron -Neodymium Equilibrium Diagram”, Russ. Metall. 6 (1965) 50–52

    Google Scholar 

  3. M. Marezio, J.P. Remeika, P.D. Dernier, “The Crystal Chemistry of the Rare Earth Orthoferrites”, Acta Cryst. B26 (1970) 2008–2022

    Google Scholar 

  4. J.F. Cannon, D.L. Robertson, H.T. Hall, “Synthesis of Lanthanide-Iron Laves Phases at High Pressures and Temperatures”, Mat. Res. Bull. 7 (1972) 5–12

    Article  CAS  Google Scholar 

  5. M.P. Dariel, M. Malekzadeh, M.R. Pickus, Proc. 21st Ann. Conf. Magn. Magn. Materials (1976) 583

    Google Scholar 

  6. N.F. Chaban, Y.B. Kuz f ma, N.S. Bilonizhko, O.O. Kachmar, N.V. Petriv, “Ternary {Nd,Sm,Gd}-Fe-B Systems”, Dopov. Akad. Nauk URSR Ser. A. : Fiz.-Mat. Tekh. Nauki 10 (1979) 875–877

    Google Scholar 

  7. M. Sagawa, S. Fujimara, N. Togawa, H. Yamamoto, Y. Matsuura, “New Material for Permanent Magnets on Base of Nd and Fe”, J. Appl. Phys. 55 (1984) 2083–2087

    Article  CAS  Google Scholar 

  8. H.H. Stadelmaier, N.A. Elmasry, N.C. Liu, S.F. Cheng, “The Metallurgy of the Iron-Neodymium-Boron Permanent Magnet System”, Mat. Lett. 2 (1984) 411–415

    Article  CAS  Google Scholar 

  9. A. Bezinge, H.F. Braun, J. Muller, K. Yvon, “Tetragonal Rare Earth (R) Iron Borides, R1+εFe4B4 (ε ≈ 0.1), With Incommensurate Rare Earth and Iron Substructures”, Solid State Com. 55 (1985) 131–135

    Article  CAS  Google Scholar 

  10. K.H.J. Buschow, D.B. De Mooij, H.M. Van Noort, “The Fe-Rich Isothermal Section of Nd-Fe-B at 900°C”, Philips J. Res. 40 (1985) 227–238

    CAS  Google Scholar 

  11. J.D. Livingston, “Iron-Rare Earth Permanent Magnets”, 8th Int.Workshop on Rare Earth Magnets and their Applications, Dayton, Ohio (1985) 423-440

    Google Scholar 

  12. Y. Matsuura, S. Hirosawa, H. Yamamoto, S. Fujimura, M. Sagawa, K. Osamura, “Phase Diagram of the Nd-Fe-B Ternary System”, Japan. J. Appl. Phys. 24 (1985) L635

    Article  Google Scholar 

  13. H.H. Stadelmaier, N.A. ElMasry, “Understanding Rare Earth Permanent Magnet Alloys: Crystal Chemistry and Problems Inherent in Phase Constitution”, Proceedings of the 4th Int. Symp. on Magn. Anisotropy and Coercivity in Rare Earth - Transition Metal Alloys, Dayton, OH, (1985) 613-633

    Google Scholar 

  14. G. Schneider, E.-Th. Henig, G. Petzow, and H.H Stadelmaier, “Phase Relations in the System Fe-Nd-B”, Z. Metallkde. 77 (1986) 755

    CAS  Google Scholar 

  15. H.H. Stadelmaier, G. Schneider, M. Ellner, “A CaCu5-Type Iron-Neodymium Phase stabilized by Rapid Solidification”, J. Less-Common Metals 115 (1986) L11–L14

    Article  CAS  Google Scholar 

  16. K.-D. Durst, H. Kronmüller, “The Coercive Field of Sintered and Melt-Spun NdFeB Magnets”, J. Magn. Magn. Mat. 68 (1987) 63–75

    Article  CAS  Google Scholar 

  17. K. -Durst, H. Kronmüller, G. Schneider, “Magnetic Hardening Mechanisms in Fe-Nd-B Type Permanent Magnets”, Proceedings of the 5th Int. Symp. on Magn. Anisotropy and Coercivity in Rare Earth - Transition Metal Alloys, Bad Soden, FRG (1987) 209-225

    Google Scholar 

  18. J. Fidler, “The Role of the Microstructure on the Coercivity of Nd-Fe-B Sintered Magnets”, Proceedings of the 5th Int. Symp. on Magn. Anisotropy and Coercivity in Rare Earth - Transition Metal Alloys, Bad Soden, FRG (1987) 363-377

    Google Scholar 

  19. B. Grieb, E.-Th. Henig, G. Schneider, G. Petzow, “Homogeneity Ranges and Phase Equilibria Around (Nd,RE)2Fe14B with RE=Tb,Dy”, Proceedings of the 5th Int. Symp. on Magn. Anisotropy and Coercivity in Rare Earth - Transition Metal Alloys, Bad Soden, FRG (1987) 395-402

    Google Scholar 

  20. E.-Th. Henig, G. Schneider, H.H. Stadelmaier, “Metastable Solidification of Fe-Rich Iron-Neodymium-Boron Alloys”, Z. Metallkde. 78 (1987) 818–820

    CAS  Google Scholar 

  21. S. Hock, H. Kronmuller, “Intrinsic Magnetic Properties of Fe14Nd2B Single Crystals”, Proceedings of the 5th Int. Symp. on Magn. Anisotropy and Coercivity in Rare Earth- Transition Metal Alloys, Bad Soden, FRG (1987) 275-282

    Google Scholar 

  22. B.M.Ma, R.F.Krause, “Microstructure and Magnetic Properties of Sintered NdDyFeB Magnets”, Proceedings of the 5th Int. Symp. on Magn. Anisotropy and Coercivity in Rare Earth - Transition Metal Alloys, Bad Soden, FRG (1987) 141-148

    Google Scholar 

  23. R.van Mens, G.W.Turk, M.Brouha, “Magnetic and Corrosion Properties of Mechanically Alloyed Nd 2 Fe u B with a Rare Earth Hydride”, Proceedings of the 9th Int. Workshop on Rare Earth Magnets and their Applications, Bad Soden, FRG (1987) 311-316

    Google Scholar 

  24. G. Schneider, E. Th. Henig, G. Petzow, H.H. Stadelmaier, “The Binary System Iron-Neodymium”, Z. Metallkde. 78 (1987) 694–696

    CAS  Google Scholar 

  25. G. Schneider, E. -Th. Henig, H.H. Stadelmaier, G. Petzow, “The Phase Diagram of Fe-Nd-B and the Optimization of the Microstructure of Sintered Magnets”, Proceedings of the 5th Int. Symp. on Magn. Anisotropy and Coercivity in Rare Earth - Transition Metal Alloys, Bad Soden, FRG (1987) 347-362

    Google Scholar 

  26. N. Zhang, Y. Luo, “Two Important Sections in the Nd-Fe-B Ternary Phase Diagram”, Proceedings of the 5th Int. Symp. on Magn. Anisotropy and Coercivity in Rare Earth- Transition Metal Alloys, Bad Soden, FRG (1987) 453-460

    Google Scholar 

  27. G.Schneider, “Konstitution und Sinterverhalten von Hartmagnetwerkstoffen auf Fe-Nd-B-Basis”, Dissertation, Universität Stuttgart (1988)

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Max-Planck-Institut für MetalIforschung, Institut für Werkstoffwissenschaften, Heisenbergstr. 5, D-7000, Stuttgart 80, Germany

    Gerhard Schneider, Ernst-Theo Henig, Bernd Grieb & Gerhard Knoch

Authors
  1. Gerhard Schneider
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Ernst-Theo Henig
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Bernd Grieb
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Gerhard Knoch
    View author publications

    You can also search for this author in PubMed Google Scholar

Editor information

Editors and Affiliations

  1. Commission of the European Communities, Brussels, Belgium

    I. V. Mitchell

  2. Trinity College, Dublin, Ireland

    J. M. D. Coey

  3. Laboratoire Louis Néel, CNRS, Grenoble, France

    D. Givord

  4. University of Birmingham, UK

    I. R. Harris

  5. Technische Universität Berlin, Federal Republic of Germany

    R. Hanitsch

Rights and permissions

Reprints and permissions

Copyright information

© 1989 ECSC, EEC, EAEC, Brussels and Luxembourg

About this chapter

Cite this chapter

Schneider, G., Henig, ET., Grieb, B., Knoch, G. (1989). Phase Equilibria in Fe-Nd-B and Related Systems and Microstructure of Sintered Fe-Nd-B Magnets. In: Mitchell, I.V., Coey, J.M.D., Givord, D., Harris, I.R., Hanitsch, R. (eds) Concerted European Action on Magnets (CEAM). Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1135-2_29

Download citation

  • DOI: https://doi.org/10.1007/978-94-009-1135-2_29

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-7003-4

  • Online ISBN: 978-94-009-1135-2

  • eBook Packages: Springer Book Archive

Publish with us

Policies and ethics

Search

Navigation