Permanent magnet and method of production

Details Permanent magnet and method of production Permanent magnet and method of production

1991-01-07

1991-12-31

Howard, Jacqueline V.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148302, 252 6257, 252 6258, H01F 104

Patent

active

050768611

ABSTRACT:
An anisotropic rare earth-iron series permanent magnet having a columnar macrostructure is provided. The magnet is prepared by melting and casting an R-Fe-B alloy in order to make a magnet having a columnar macrostructure and heat treating the cast alloy at a temperature of greater than or equal to about 250.degree. C. in order to magnetically harden the magnet. Alternatively, the cast alloy can be hot processed at a temperature greater than or equal to about 500.degree. C. in order to align the axes of the crystal grains in a specific direction and make the magnet anisotropic. In another embodiment, the cast alloy can be hot processed at a temperature of greater than or equal to about 500.degree. C. and then heat treated at a temperature of greater than or equal to about 250.degree. C.

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Lee, "Hot-Pressed Neodymium-Iron-Boron Magnets", Appl. Phys. Lett. 46(8), Apr. 15, 1985, pp. 790-791.

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