×

METHOD FOR PRODUCING R-T-B SINTERED MAGNET

  • US 20140375404A1
  • Filed: 01/17/2013
  • Published: 12/25/2014
  • Est. Priority Date: 01/19/2012
  • Status: Active Grant
First Claim
Patent Images

1. A method for producing a sintered magnet, the method comprising the steps of:

  • providing a sintered R-T-B based magnet body, of which the R mole fraction that is defined by the content of a rare-earth element falls within the range of 31 mass % to 37 mass %;

    providing an RH diffusion source including a heavy rare-earth element RH (which is at least one of Dy and Tb) and 30 mass % to 80 mass % of Fe;

    loading the sintered magnet body and the RH diffusion source into a processing chamber so that the magnet body and the diffusion source are movable relative to each other and readily brought close to, or in contact with, each other; and

    performing an RH diffusion process by conducting a heat treatment on the sintered magnet body and the RH diffusion source at a process temperature of 700°

    C. to 1000°

    C. while moving the sintered magnet body and the RH diffusion source either continuously or discontinuously in the processing chamber.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×