Hot pressing Nd-Fe-B HDDR powders

Author

Ragg, O.M. ; Harris, I.R. ; Nagel, H. ; Bohm, P.

Author_Institution

Dept. of Metall. & Mater., Birmingham Univ., UK

Volume

32

Issue

5

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

4395

Lastpage

4397

Abstract

Details of the important parameters for hot pressing isotropic Nd ₁₆Fe₇₆B₈ HDDR powders are presented. Optimum magnetic properties may be achieved over broad ranges of green compaction pressure and hot pressing temperature, time and pressure. Isotropic HDDR powders with lower Nd-contents (i.e. Nd₁₄Fe ₇₉B₇ and Nd₁₃Fe_80.5B_6.5) may also be hot pressed to full density to produce magnets with energy products 100 kJ/m and some advantages of hot pressing the lower Nd-content compositions are stated. The cause of the enhanced values of remanence obtained nominally isotropic hot pressed HDDR magnets is probably due to some alignment induced during hot pressing. The ease of hot pressing HDDR powder this process is commercially viable, particularly as the HDDR powder production process has been estimated to be cheaper than that of the MQ powder

Keywords

boron alloys; ferromagnetic materials; hot pressing; iron alloys; magnetic particles; neodymium alloys; permanent magnets; remanence; stoichiometry; HDDR powders; Nd₁₃Fe(₈0.5)B_6.5; Nd₁₃Fe_80.5B_6.5; Nd₁₄Fe₇₉B₇; Nd₁₆Fe₇₆B₈; green compaction pressure; hot pressing pressure; hot pressing temperature; hot pressing time; remanence; Compaction; Iron; Magnetic properties; Magnets; Neodymium; Powders; Pressing; Production; Remanence; Temperature distribution;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.538880

Filename

538880