Title :
As-melt-spun anisotropy of Nd-Fe-B-M flakes (M=Cr or Mo/W/Mn/Co/Ni)
Author :
Chin, Tsung-Shune ; Huang, Sen-Huann ; Yau, June-Min
Author_Institution :
Dept. of Mater. Sci. & Eng., Tsing Hua Univ., Hinschu, Taiwan
fDate :
11/1/1993 12:00:00 AM
Abstract :
As-melt-spun anisotropy of Nd-Fe-B-M (M is 0.5 to 3 at.% Cr or Mo/W/Mn/Co/Ni) flakes is studied. It is found that 1 at.% addition of Mo or Mn, Co results in much higher remanence and maximum energy product measured normal to the flake surface than that parallel, from flakes obtained at moderate wheel speeds, Vs, of 10 to 12 m/s. Field-aligned and resin-bonded 325 mesh powders ground from the 1 at.% Mo or Mn/Co added flakes (Vs=10 m/s) show 79% or 45/33% higher remanence measured along the field direction with respect to the perpendicular direction. The deteriorated coercivity of the powders due to grinding can be 70 to 100% restored by etching in a dilute nitric acid solution. Hence, these flakes may be readily applicable to anisotropic resin bond magnets
Keywords :
alloying additions; boron alloys; chromium alloys; cobalt alloys; coercive force; etching; ferromagnetic properties of substances; iron alloys; magnetic anisotropy; magnetic properties of fine particles; manganese alloys; molybdenum alloys; neodymium alloys; nickel alloys; permanent magnets; powder metallurgy; remanence; tungsten alloys; Nd-Fe-B-M flakes; NdFeBCr; NdFeBMn; NdFeBMo; NdFeBW; anisotropic resin bond magnets; as-melt spun anisotropy; coercivity; etching; field aligned powders; grinding; maximum energy product; powders; remanence; resin-bonded 325 mesh powders; Anisotropic magnetoresistance; Chromium; Coercive force; Energy measurement; Etching; Magnetic field measurement; Powders; Remanence; Velocity measurement; Wheels;
Journal_Title :
Magnetics, IEEE Transactions on
