INTENSIFYING METHOD FOR COERCIVE FORCE OF Nd-Fe-B SYSTEM MAGNETIC SUBSTANCE

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PROBLEM TO BE SOLVED : To provide a coercive force intensifying method for Nd-Fe-B system magnetic substance, capable of achieving high utilization efficiency of a heavy rare earth material, high purity of a heavy rare earth membrane layer, high deposition speed, suitable mass production and remarkable intensification of a coercive force of a magnetic substance after heat treatment. SOLUTION : A flake of Nd-Fe-B system magnetic substance is placed on an argon gas protection container, dysprosium, terbium or dysprosium-terbium alloy powder is sprayed uniformly on a surface of the Nd-Fe-B system magnetic substance. The powder on the surface of the Nd-Fe-B system magnetic substance is heat-hardening deposited promptly by a rapid heating method. The magnetic substance is charged into a vacuum furnace for heat treatment to diffuse heavy rare earth element to the inside of the magnetic substance along a grain boundary for intensifying a coercive force without degrading a residual flux density. SELECTED DRAWING : None COPYRIGHT : (C)2019, JPO&INPIT