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Aspects of NdFeB HDDR Powders: Fundamentals and Processing

  • N. Cannesan
  • I. R. Harris
Part of the NATO Science Series book series (NAII, volume 118)

Abstract

In this review, important aspects of the Hydrogenation, Disproportionation, Desorption and Recombination (HDDR) process are considered. The most surprising feature of the HDDR process in NdFeB (and PrFeB)-type alloys is the development of anisotropy in the Nd2Fe14B phase after recombination of the disproportionated mixture. Early work on this phenomenon reported that alloying additions such as Co and/or Ga were essential in developing the preferred orientation but it has now been shown quite conclusively that appreciable degrees of anisotropy can be developed in the ternary NdFeB alloys provided the appropriate temperatures and hydrogen pressures are employed during disproportionation and recombination. The detailed nature of the anisotropy mechanism still requires clarification but the presence of an intermediate boride could be the deciding factor and would explain the absence of any anisotropy in the Sm3Fe17N3-H2 system.

Keywords

Crystallographic Orientation Hydrogen Pressure Recombination Reaction Disproportionation Reaction Anisotropy Mechanism 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 2003

Authors and Affiliations

  • N. Cannesan
    • 1
  • I. R. Harris
    • 1
  1. 1.Department of Metallurgy and MaterialsUniversity of BirminghamBirminghamUK

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