Permanent magnet having improved corrosion resistance and method

Details Permanent magnet having improved corrosion resistance and method Permanent magnet having improved corrosion resistance and method

1990-04-10

1992-11-10

Sheehan, John P.

Metal treatment

Stock

Magnetic

420 83, 420121, 75233, 75237, 75244, H01F 1053

Patent

active

051620642

ABSTRACT:
A permanent magnet of the neodymium-iron-boron type having improved corrosion resistance imparted by a combination of oxygen, carbon and nitrogen. Oxygen is provided in an amount equal to or greater than 0.6 weight percent in combination with carbon of 0.05-0.15 weight percent and nitrogen 0.15 weight percent maximum. Preferably, oxygen is within the range of 0.6-1.2% with carbon of 0.05-0.1% and nitrogen 0.02-0.15 weight percent or more preferably 0.04-0.08 weight percent. The magnet may be heated in an argon atmosphere and thereafter quenched in an atmosphere of either argon or nitrogen to further improve the corrosion resistance of the magnet.

REFERENCES:
patent: 4588439 (1986-05-01), Narasimhan et al.
Patent Abstracts of Japan, vol. 11, No. 381 (C-464)[2828], Dec. 12, 1987; Japanese Patent Document No. 62-151542, dated Jul. 6, 1987, S C S K.K. (Ichinose).
Patent Abstracts of Japan, vol. 11, No. 361 (C-459)[2808], Nov. 25, 1987; Japanese Patent Document No. 62-133040, dated Jun. 16, 1987, Shin Etsu Chem. Co., Ltd. (Ohashi).
Patent Abstracts of Japan, vol. 13, No. 139 (E-738)[3487], Apr. 6, 1989; Japanese Patent Document No. 63-301505, dated Dec. 8, 1988, Hitachi Metals Ltd. (Kobayashi).
IEEE Transactions on Magnetics, vol. 26, No. 5, Sep. 1990, pp. 1936-1938; "Effect of Oxygen, Carbon, and Nitrogen Contents on the Corrosion Resistance of Nd-Fe-B Magnets", Kim et al.

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