Method of casting a reactive metal against a surface formed from

Details Method of casting a reactive metal against a surface formed from Method of casting a reactive metal against a surface formed from

1989-11-08

1990-08-14

Seidel, Richard K.

Metal founding

Process

Shaping a forming surface

164516, B22C 102

Patent

active

049479270

ABSTRACT:
Reactive metals, such as titanium or nickel-chrome superalloys containing rare earths, are cast with mold and/or core surface areas formed from an improved slurry. The improved slurry contains yttria to form an inert surface which is exposed to the molten reactive metal. In order to prevent premature gelation of the slurry, the forming of defects in the mold and/or core surface areas, and the forming of defects in the cast article, the slurry contains a source of hydroxyl ions. The source of hydroxyl ions is sufficient to result in the slurry having a pH of at least 10.2 six days after initially mixing the slurry. The source of hydroxyl ions may be a metal alkali or an organic hydroxide. It is believed that the source of hydroxyl ions functions as a hydration suppressant for the yttria to prevent premature gelation of the slurry. The slurry contains a silicon oxide (SiO.sub.2) to alkali ratio which is equivalent to a silicon oxide to sodium oxide (Na.sub.2 O) dry weight ratio of less than thirty-to-one (30:1).

REFERENCES:
patent: 3955616 (1976-05-01), Gigliotti, Jr. et al.
patent: 4063954 (1977-12-01), Brown
patent: 4578487 (1986-03-01), Barfurth et al.
patent: 4703806 (1987-11-01), Lassow et al.
patent: 4787439 (1988-11-01), Feagin
patent: 4799532 (1989-01-01), Mizuhara
Publication by E. D. Calvert and entitled "An Investment Mold for Titanium Castings", Bureau of Mines, Report of Investigation 8541.

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