Compositions: coating or plastic – Coating or plastic compositions – Molds and mold coating compositions
Patent
1990-05-14
1993-06-22
Bell, Mark L.
Compositions: coating or plastic
Coating or plastic compositions
Molds and mold coating compositions
106 3822, 106600, 501126, 164518, C04B 3568
Patent
active
052213366
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).
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Publication by E. D. Calvert and entitled "An Investment Mold for Titanium Castings", Bureau of Mines, Report of Investigation 8541.
Bell Mark L.
PCC Airfoils, Inc.
Wright Alan
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