Phosphorus-iron powder and method of producing soft magnetic mat

Details Phosphorus-iron powder and method of producing soft magnetic mat Phosphorus-iron powder and method of producing soft magnetic mat

1978-11-27

1980-12-02

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

75201, 75211, 75214, 75230, 75246, 75255, 252 6255, 148 3155, H01F 102

Patent

active

042369452

ABSTRACT:
A phosphorus-iron powder is disclosed for use in the pressing and sintering of soft magnetic parts. This powder comprises a substantially phosphorous free iron powder blended with a sufficient quantity of ferrophosphorus powder having an average particle size of at least 10 micron and a phosphorus content of from 18 to 30%, to arrive at a phosphorus content for the mixture in a range of from about 0.40 to 1.25%. By pressing the blended mixture to a green density of at least 6.0 grams per cubic centimeter, and sintering the pressed mixture in a nonoxidizing atmosphere at a temperature of at least 1900.degree.F., the part linear shrinkage during sintering is less than 2%.

REFERENCES:
patent: 3836355 (1974-09-01), Lindskog et al.
patent: 4000980 (1977-01-01), Morishita et al.
patent: 4047893 (1977-09-01), Falkowski et al.
patent: 4090868 (1978-05-01), Tengzelius et al.
patent: 4093449 (1978-06-01), Svensson
patent: 4115158 (1978-09-01), Reen
"Phosphorus as an Alloying Element in Ferrous P/M", Lindskog et al., Modern Developments in Powder Metallurgy, vol. 10, Ferrous and Nonferrous P/M Materials, pp. 97-128, copyright 1977.
"The Influence of Particle Size and Phosphorous Additions on Soft Magnetic Properties of Sintered High Purity Atomized Iron", Tengzelius et al., Presented at Fifth European Symposium on P/M Jun. 4-8, 1978.

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