Method of making rare earth magnets

Details Method of making rare earth magnets Method of making rare earth magnets

1990-04-27

1991-09-17

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 419 12, H01F 102

Patent

active

050492039

ABSTRACT:
A powder X formed by quenching a molten alloy containing, on an atomic percent basis, at least 8%, but less than 13%, of a rare earth component consisting mainly of one or both of neodymium and praseodymium, and 4 to 8% of boron, the balance of its composition being iron and unavoidable impurities, and a powder Y formed by quenching a molten alloy containing, on an atomic percent basis, 13 to 20% of a rare earth component consisting mainly of one or both of neodymium and praseodymium, and 4 to 8% of boron, the balance of its composition being iron and unavoidable impurities, are mixed to prepare a mixture containing 5 to 50% by volume of powder Y. The mixture is subjected to heat and pressure to make a rare earth magnet containing, on an atomic percent basis, 9 to 14% of a rare earth component consisting mainly of one or both of neodymium and praseodymium, and 4 to 8% of boron, the balance of its composition being iron and unavoidable impurities.

REFERENCES:
patent: 4898625 (1990-02-01), Otsuka et al.

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