Method of making permanent magnets

Details Method of making permanent magnets Method of making permanent magnets

1992-04-15

1993-09-07

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148105, 75332, 75338, 75349, H01F 108

Patent

active

052425088

ABSTRACT:
A method for making an isotropic permanent magnet comprises atomizing a melt of a rare earth-transition metal alloy (e.g., an Nd--Fe--B alloy enriched in Nd and B) under conditions to produce protectively coated, rapidly solidified, generally spherical alloy particles wherein a majority of the particles are produced/size classified within a given size fraction (e.g., 5 to 40 microns diameter) exhibiting optimum as-atomized magnetic properties and subjecting the particles to concurrent elevated temperature and elevated isotropic pressure for a time effective to yield a densified, magnetically isotropic magnet compact having enhanced magnetic properties and mechanical properties.

REFERENCES:
patent: 3663317 (1972-05-01), Westendorp et al.
patent: 3904448 (1975-09-01), Takahashi et al.
patent: 4104787 (1978-08-01), Jandeska et al.
patent: 4290826 (1981-09-01), Clegg
patent: 4402770 (1983-09-01), Koon
patent: 4533408 (1985-08-01), Koon
patent: 4585473 (1986-04-01), Narasimhan et al.
patent: 4597938 (1986-07-01), Matsuura et al.
patent: 4601875 (1986-07-01), Yamamoto et al.
patent: 4619845 (1987-10-01), Ayers et al.
patent: 4636353 (1987-01-01), Seon et al.
patent: 4664724 (1987-05-01), Mizoguchi et al.
patent: 4770723 (1988-09-01), Sagawa et al.
patent: 4801340 (1989-01-01), Inoue et al.
patent: 4802931 (1989-02-01), Croat
patent: 4834812 (1989-05-01), Ghandehari
patent: 4867809 (1989-09-01), Haverstick
patent: 4911882 (1990-03-01), Greenwald
Hot-Pressed Neodymium-Iron-Boron Magnets, R. W. Lee, Appl. Phys. Lett., 1985.
Iron-Based Rare-Earth Magnets, J. J. Croat, Chairperson, J. Appl. Phys., 1985.
Nd--Fe--B Permanent Magnet Materials, Japanese Journal of Applied Science, 1987, Masato Sagawa et al.
Processing of Neodymium-Iron-Boron Melt-Spun Ribbons to Fully Dense Magnets, R. W. Lee et al., IEE Transactions on Magnetics, 1985.
Flow Measurements in Gas Atomization Processes, R. S. Figliola et al., 1989.
Permanent Magnet Materials Based on the Rare Earth-Iron-Boron Tetragonal Compounds, M. Sagawa et al., IEE Transactions on Magnetics, 1985.
New Material for Permanent Magnets on a Base of Nd and Fe, M. Sagawa et al., American Institute of Physics, 1984.
Materials Research for Advanced Inertial Instrumentation, D. Das et al., 1978.
Low oxygen processing of SmCo.sub.5 magnets, K. S. V. L. Narasimhan, J. Appl. Phys., 1981.
Fluid Flow Effects in Gas Atomization Processing, I. E. Anderson et al., International Symposium on the Physical Chemistry of Powder Metals Production and Processing, 1989.
Observations of Gas Atomization Process Dynamics, I. E. Anderson et al., MPIF-AMPI, 1988.

Affiliated with

Also associated with

Rating

Method of making permanent magnets does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of making permanent magnets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making permanent magnets will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-484596