Title :
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
fDate :
9/1/2002 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.803070
