1. Sintered rare earth permanent magnet
They include samarium cobalt and neodymium iron boron.
A proportioning of pure metal or alloy
B/vacuum induction melting
C crushing airflow grinding powder (nitrogen protection) about 5 microns
D magnetic field orientation molding plus isostatic pressure
E vacuum and protective atmosphere sintering
F post heat treatment
G machining, coating
H pulse magnetization
Ferrite permanent magnet
A oxide ingredients (SrO CaO,Fe2O3) are mixed proportionally
B presintering
C ball mill 1 micron or so
D oriented molding under magnetic field (dry press or wet press)