Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Consolidation of powder prior to sintering
Patent
1983-07-08
1985-12-31
Cockeram, Herbert S.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Consolidation of powder prior to sintering
B22F 100
Patent
active
045620415
ABSTRACT:
The method disclosed in this specification is one of reducing the green density of an article cast in a slip casting operation. The article is cast from a casting slip containing silicon metal particles, yttrium containing particles, and a small amount of a fluoride salt which is effective to suppress flocculation of the silicon metal particles by y.sup.+3 ions derived from the yttrium containing particles. The method is characterized by the following step. A small amount of compound which produces a cation which will partly flocculate the particles of silicon metal is added to the casting slip. The small amount of this compound is added so that when the casting slip is slip cast into a casting mold, the partly flocculated particles of silicon will interrupt an otherwise orderly packing of the particles of silicon and particles of yttrium. In this manner, the green density of the slip cast article is reduced and the article may be more easily nitrided.
REFERENCES:
patent: 3322536 (1967-05-01), Stoddard et al.
patent: 3489555 (1970-01-01), Thellmann
patent: 4112143 (1978-09-01), Adlerborn et al.
patent: 4229217 (1980-10-01), Haehn
Dickie Ray A.
Mangels John A.
Cockeram Herbert S.
Ford Motor Company
Johnson William E.
Sadler Clifford L.
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