SURFACE-TREATED RARE EARTH-BASED MAGNETIC POWDER, RESIN COMPOSITION FOR BOND MAGNET CONTAINING THE RARE EARTH-BASED MAGNETIC POWDER, AND BOND MAGNET

摘要

PROBLEM TO BE SOLVED: To provide an Nd-Fe-B-based magnetic powder or an Sm-Fe-N-based magnetic powder for a bond magnet, which has superior rust preventive properties and excellent fluidity; a resin composition for a bond magnet containing the magnetic powder; and the bond magnet.;SOLUTION: The Nd-Fe-B-based magnetic powder or the Sm-Fe-N-based magnetic powder is coated with a phosphate compound; is covered with a composite metal phosphate film including a silicon compound that originates from an alkoxy oligomer of which the molecular end is blocked with an alkoxysilyl group and contains silica as a main component, and a phosphate compound; and further is surface-treated with a silane coupling agent. The rare earth-based magnetic powder is made of the surface-treated Nd-Fe-B-based magnetic powder or the surface-treated Sm-Fe-N-based magnetic powder, of which the quantity of leaching Fe is 10 mg/L or less.;COPYRIGHT: (C)2010,JPO&INPIT