Magnetic Properties of Rapidly Quenched Nd-Fe-B Ribbons for Bonded Magnet Use

Abstract

Magnetic properties are investigated for ribbon specimens melt-spun under an optimal quenching rate of 16 m/sec. Their compositions are quaternary, discribed as Nd_13.3(Fe, M)₈₀ B_6.7 (M=Al, Ga, Co). Results obtained are summarized as follows:
(1) X-ray diffraction patterns for a ternary ribbon with Nd_13.3 Fe₈₀B_6.7 composition reveals that the 2-14-1 phase has no preffered orientation. The demagnetization curve is of regular shape and exhibits the coercive force of 14.9 k0e.
(2) The addition of suitable amounts of Al or Ga to the ternary ribbons improves the room temperature coercive force without introducing the serious decrease in Curie temperature.
(3) With Cc addition, paticularly, it is found that the Curie temperature and the coercive force are simultaneously improved, which is seemed to be characteristic for rapidly quenched ribbon and has never reported for sintered magnet.