Method of obtaining a magnetic material of the rare earth/transi

Details Method of obtaining a magnetic material of the rare earth/transi Method of obtaining a magnetic material of the rare earth/transi

1991-07-25

1993-06-22

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148105, 148122, H01F 102

Patent

active

052213684

ABSTRACT:
The invention relates to a method of obtaining friable and relatively inert TR Fe B type magnetic materials in divided form which lead to magnets having improved corrosion resistance. This method involves treating the material in an atmosphere containing (or capable of containing) hydrogen under the following conditions of absolute pressure (P) and of temperature (T.degree. C.): if P.ltoreq.Pa, 250<T<550; and if P>Pa, 250+100 log (P/Pa)<T<250+100 log (P/Pa) log base 10, Pa being atmospheric pressure. The invention is used for obtaining sintered TR Fe B magnets having improved corrosion resistance.

REFERENCES:
patent: 4853045 (1989-08-01), Rozendaal
patent: 5091020 (1992-02-01), Kim
patent: 5110374 (1992-05-01), Takeshita et al.

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