Manganese sulfide composition and its method of production

Details Manganese sulfide composition and its method of production Manganese sulfide composition and its method of production

1996-05-08

1998-06-16

Mai, Ngoclan

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 28, 419 38, 423511, B22F 312

Patent

active

057686785

ABSTRACT:
Disclosed is a metal sulfide composition for use as a machining aid comprising 55.0% to 65.0% by weight of manganese, 29.0% to 36.0% by weight of sulfur, and greater than 2.0% to 10% by weight of iron. Also disclosed is a method of making the metal sulfide composition comprising mixing manganese, sulfur, and iron; initiating an exothermic reaction between the manganese and sulfur, wherein the iron component moderates and cools the exothermic reaction; forming a solid mass of manganese sulfide composition containing a portion of the iron suspended therein; and recovering the solid manganese sulfide composition. A method of using the manganese sulfide composition according to the present invention as a machining aid comprises mixing into a blend a desired metal powder with the manganese sulfide composition; spreading the blend into a metal part die; compacting the blend into the die; sintering the compacted part; and machining the sintered part.

REFERENCES:
patent: 2770527 (1956-11-01), Alderson et al.
patent: 3705020 (1972-12-01), Nachtman
patent: 3956146 (1976-05-01), Tsuya et al.
patent: 4676970 (1987-06-01), Todd et al.
Improvement of Machinability in PM Parts Using Manganese Sulfide; K.S. Chopra; pp. 501-510; vol. 43; Progress in Powder Metallurgy.

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