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

1992-10-27

1994-02-01

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148121, 419 12, 419 29, H01F 102

Patent

active

052829049

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: 4814139 (1989-03-01), Tokunaga et al.
patent: 4826546 (1989-05-01), Yamamoto et al.
Kim et al., "Effect of Oxygen, Carbon, and Nitrogen Contents on the Corrosion Resistance of Nd-Fe-B Magnets", IEEE Transactions on Magnetics, vol. 26, No. 5, Sep. 1990.

Affiliated with

Also associated with

Rating

Permanent magnet having improved corrosion resistance and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Permanent magnet having improved corrosion resistance and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Permanent magnet having improved corrosion resistance and method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-576944