Rare earth permanent magnet powder, method for producing same an

Details Rare earth permanent magnet powder, method for producing same an Rare earth permanent magnet powder, method for producing same an

1992-11-19

1994-08-16

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148122, H01F 102

Patent

active

053383710

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 or 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.

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