Anisotropic magnetic powder and magnet thereof and method of producing same

A magnetically anisotropic pressed powder magnet having improved thermal stability, made of magnetically anisotropic R-TM-B-Ga alloy having an average crystal grain size of 0.01-0.5 .mu.m wherein R consisting essentially of Nd part of which may be substituted with Dy, TM represents Fe which may be partially substituted by Co, B represents boron, and Ga represents gallium, said magnetically anisotropic R-TM-B-Ga alloy having an axis of easy magnetization, wherein said R-TM-B-Ga alloy comprises 11-18 atomic % of R, 4-11 atomic % of B, 5 atomic % or less of Ga and balance Fe which may be partially substituted by 30 at % or less of Co, and inevitable impurities.

A magnetically anisotropic resin-bonded magnet of rare earth-iron-boron having improved thermal stability composed of 15-40 volume % of a resin binder and balance R-TM-B-Ga alloy powder having an average crystal grain size of 0.01-0.5 .mu.m, wherein R represents one or more rare earth elements including Y, TM represents Fe which may be partially substituted by Co, B represents boron and Ga represents gallium, said magnetically anisotropic R-TM-B-Ga alloy having an axis of easy magnetization, wherein said R-TM-B-Ga alloy comprises 11-18 atomic % of R, 4-11 atomic % of B, 5 atomic % or less of Ga, and balance Fe which may be partially substituted by 30 at % or less of Co, and inevitable impurities.

A magnetically anisotropic magnetic powder of rare earth-iron-boron having improved thermal stability, the powder having an average particle size of 1-1000 .mu.m, and composed of an R-TM-B-Ga-M alloy powder having an average crystal grain size of 0.01-0.5 .mu.m, wherein R represents one or more rare earth elements including Y, TM represent Fe which may be partially substituted by Co, B represents boron, Ga represents gallium and M represents one or more elements selected from the group consisting of Nb, W, V, Ta, Mo, Si, Al, Zr, Hf, P, C and Zn, wherein said R-TM-B-Ga-M alloy comprises 11-18 atomic % of R, 4-11 atomic % of B, 5 atomic % or less of Ga, 3 atomic % or less of M and balance Fe which may be partially substituted by 30 at % or less of Co, and inevitable impurities.

A magnetically anisotropic pressed powder magnet having improved thermal stability made of magnetically anisotropic R-TM-B-Ga-M alloy having an average crystal grain size of 0.01-0.5 .mu.m, wherein R consisting essentially of Nd part of which may be substituted by Dy, TM represents Fe which may be partially substituted by Co, B represents boron, Ga represents gallium, and M represents one or more elements selected from the group consisting of Nb, W, V, Ta, Mo, Si, Al, Zr, Hf, P, C and Zn, said magnetically anisotropic R-TM-B-Ga-M alloy having an axis of easy magnetization, wherein said R-TM-B-Ga-M alloy comprises 11-18 atomic % of R, 4-11 atomic % of B, 5 atomic % or less of Ga, 3 atomic % or less of M and balance Fe which may be partially substituted by 30 at % or less of Co, and inevitable impurities.

A magnetically anisotropic resin-bonded magnet of rare earth-iron-boron having improved thermal stability composed of 15-40 volume % of a resin binder and balance R-TM-B-Ga-M alloy powder having an average crystal grain size of 0.01-0.5 .mu.m, wherein R represents one or more rare earth elements including Y, TM represents Fe which may be partially substituted by Co, B represents boron, Ga represents gallium, and M represents one or more elements selected from the group consisting of Nb, W, V, Ta, Mo, Si, Al, Zr, Hf, P, c and Zn, said magnetically anisotropic R-TM-B-Ga-M alloy having an axis of easy magnetization, wherein said R-TM-B-Ga-M alloy comprises 11-18 atomic % of R, 4-11 atomic % of B, 5 atomic % or less of Ga, 3 atomic % or less of M and balance Fe which may be partially substituted by 30 at % of Co, and inevitable impurities.