Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Alloying occurs during sintering
Patent
1981-11-19
1984-02-07
Hunt, Brooks H.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Alloying occurs during sintering
419 47, 428567, B22F 300
Patent
active
044302959
ABSTRACT:
In the preferred embodiment, a method is presented for forming an iron-base article by powder metallurgy, which includes compacting a powder mixture comprising a major portion of iron particles and between about 2 to about 5 weight percent of a powder consisting of hypereutectic tricopper phosphide Cu.sub.3 P compound. The compact is sintered at a temperature between about 970.degree. C. to about 1100.degree. C., whereupon the copper phosphide forms a liquid that flows and wets the iron particle surfaces. During sintering, phosphorus from the copper phosphide diffuses into the iron particles and resulting copper-enriched liquid forms a film coating pore surfaces in the compact. The sintered article displays an improved combination of ductility and strength, particularly in view of the relatively low sintering temperature.
REFERENCES:
patent: 2213523 (1940-09-01), Jones et al.
patent: 2226520 (1940-12-01), Lenel
patent: 3674472 (1972-07-01), Kimura et al.
Jones, Fundamental Principles of Powder Metallurgy 1960, pp. 504, 505, 508, 509.
Bockstiegel et al., "Influence of Various Alloying Additions on Case Hardening of Sintered Steel Parts", by Hoganas Presented 9-66 in Czechoslovakia.
Fekete Douglas D.
General Motors Corporation
Hunt Brooks H.
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