Extrusion of strontium hexaferrite magnets with radial alignment using hydrothermally synthesized powder

Author

Yuan, Z.C. ; Blackburn, S. ; Williams, A.J. ; Harris, I.R.

Author_Institution

IRC in Mater. Process., Univ. of Birmingham, UK

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2925

Lastpage

2927

Abstract

Hydrothermally synthesized strontium hexaferrite (HT-SrM) powder was combined with an ethylvinylacetate (EVA)-paraffin wax system to give an extrudable paste from which tubular magnets were produced. Due to the very high specific surface area of the plate-like hexaferrite particles, the maximum solids loading was ∼46 vol% when mixed at 120°C. Using such pastes, a degree of radial magnetic alignment in tubular extrudates was induced by the paste flow. The extrusion parameters and the influence of die gap on the orientation of SrM particles have been investigated.

Keywords

extrusion; ferrites; magnetic particles; permanent magnets; powder technology; strontium compounds; 120 degC; SrFe₁₂O₁₉; anisotropic magnet; die gap; ethylvinylacetate-paraffin wax system; extrusion; hydrothermal synthesis; paste flow; plate-like particle orientation; radial magnetic alignment; solid loading; specific surface area; strontium hexaferrite powder; tubular magnet; Anisotropic magnetoresistance; Electromagnetic fields; Magnetic anisotropy; Magnets; Perpendicular magnetic anisotropy; Powders; Production; Reluctance motors; Rheology; Strontium;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.803070

Filename

1042412