Patent ID: 8500920

Claim:
A manufacturing method of a Nd—Fe—B based permanent magnet comprising steps of milling magnet material into magnet powder; adding an organometallic compound expressed with a structural formula of M-(OR) X , M representing V, Mo, Zr, Ta, Ti, W or Nb, R representing a substituent group consisting of a straight-chain or branched-chain hydrocarbon, and X representing an arbitrary integer, to the magnet powder obtained at the step of milling magnet material and getting the organometallic compound adhered to particle surfaces of the magnet powder; compacting the magnet powder of which particle surfaces have got adhesion of the organometallic compound so as to obtain a compact body; calcining the compact body in hydrogen atmosphere so as to obtain a calcined body; and sintering the calcined body, wherein the permanent magnet is Nd—Fe—B based.