Rare earth permanent magnet power, method for producing same and

Details Rare earth permanent magnet power, method for producing same and Rare earth permanent magnet power, method for producing same and

1990-07-31

1993-07-20

Sheehan, John P.

Metal treatment

Stock

Magnetic

420 83, 420121, 252 6254, 75244, H01F 1053

Patent

active

052289303

ABSTRACT:
There is disclosed a R-Fe-B or R-Fe-Co-B alloy permanent magnet powder which may contain Ga, Zr or Hf, or may further contain Al, Si or V. Each individual particle of the powder includes a structure of recrystallized grains containing a R.sub.2 Fe.sub.14 B or R.sub.2 (Fe,Co).sub.14 B intermetallic compound phase. The intermetallic compound phase has recrystallized grains of a tetragonal crystal structure having an average crystal grain size of 0.05 to 20 .mu.m. At least 50% by volume of the recrystallized grains of the aggregated structure are formed so that a ratio of the greatest dimension to the smallest dimension is less than 2 for each recrystallized grain. In order to manufacture the magnet powder, regenerative material and alloy material are prepared and their temperature is elevated in a hydrogen atmosphere. Then, the alloy material and the regenerative material are held in the same atmosphere at a temperature of 750.degree. C. to 950.degree. C., and then held in a vacuum at 750.degree. C. to 950.degree. C., and cooled and crushed. A bonded magnet produced using the above magnet powder is also disclosed.

REFERENCES:
patent: 4935075 (1990-06-01), Mizoguchi et al.
patent: 4981532 (1991-01-01), Takeshita et al.
Panchanathan, et al., Properties of Rapidly Solidified Nd-Fe-Ca-Co-B Alloys, IEEE Transactions on Magnetics, vol. 25, No. 5, Sep. 1989, pp. 4111-4113.

Affiliated with

Also associated with

Rating

Rare earth permanent magnet power, method for producing same and does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rare earth permanent magnet power, method for producing same and, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rare earth permanent magnet power, method for producing same and will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1757810