ND-FE-B BASED MAGNET POWDER FOR BONDED MAGNET EXCELLENT IN CORROSION RESISTANCE, BONDED MAGNET AND PRODUCTION OF MAGNET POWDER

摘要

PURPOSE: To obtain an Nd-Fe-B based magnet powder for bonded magnet excellent in corrosion resistance, a bonded magnet excellent in corrosion resistance produced of that magnet powder, and a production method of magnet powder. ;CONSTITUTION: An SiO₂ protective film is formed on the surface of an Nd-Fe-B based magnet powder to produce a powder for bonded magnet excellent in corrosion resistance. The magnetic powder is bound by a resin binder to obtain a bonded magnet. A silicon dioxide protective film is formed on the surface of an Nd-Fe-B based magnet powder by sol-gel reaction using ethylsilicate or plasma chemical deposition to produce an Nd-Fe-B based magnet powder for bonded magnet excellent in corrosion resistance.;COPYRIGHT: (C)1996,JPO