Tin-containing ferrous composite powder and method of producing

Details Tin-containing ferrous composite powder and method of producing Tin-containing ferrous composite powder and method of producing

1985-06-11

1987-02-17

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75255, 428570, C22C 3300

Patent

active

046437657

ABSTRACT:
As the raw material of a ferrous sintered alloy, a ferrous composite powder excellent in both compressibility and distribution of alloying elements is obtained by mixing an iron powder or a Sn-free low-alloy iron powder with at least one secondary powder comprising at least one of C, Co, Cr, Cu, Mn, Mo, Ni, P and Si and another powder comprising Sn and heating the powder mixture in a nonoxidizing atmosphere at 250.degree.-900.degree. C. to result in that the secondary powder(s) is at least partially bonded to the iron particles with Sn as a sort of cementing medium. In the powder mixture the content of Sn is 0.1-20 wt %, and the weight ratio of the secondary powder(s) to Sn is not greater than 50:1. Also disclosed is a ferrous sintered magnetic material high in magnetic flux density and small in iron loss, which contains 1-12 wt % of Si, 0.05-7 wt % of Sn and, optionally, 0.05-2 wt % of P and in which Sn concentrates on the surfaces of iron particles.

REFERENCES:
patent: 3161948 (1964-12-01), Bechtold
patent: 3254990 (1966-06-01), Goering
patent: 3429696 (1969-02-01), Werley
patent: 4174235 (1979-11-01), Fiedler
patent: 4293336 (1981-10-01), Matsumura
patent: 4540437 (1985-09-01), Patel

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