Metal founding – Process – Shaping a forming surface
Patent
1993-07-08
1995-04-18
Lin, Kuang Y.
Metal founding
Process
Shaping a forming surface
106 3835, B22C 106, B22C 904
Patent
active
054070015
ABSTRACT:
The disclosure describes an aqueous ceramic slurry having from about 70-weight percent to about 85 weight-percent of a fused yttria-zirconia material. The weight percent of zirconia in the fused yttria-zirconia preferably varies from about 1.0 weight percent to about 10.0 weight percent. Fused slurries may comprise, in addition to fused yttria-zirconia, an inorganic binder (preferably silica), an organic binder (preferably a latex binder), a surfactant (preferably a sodium dioctyl sulfosuccinate), an antifoaming agent (preferably a water-dilutable active silicone defoamer) and titanium dioxide. The slurries of the present invention are used to form ceramic mold facecoatings for casting reactive materials. These slurries are less sensitive to pH fluctuations than are slurries made from 100 percent yttria (yttria slurries). Moreover, slurries as described in the disclosure do not gel prematurely, and exhibit substantially the same formation of oxygen-enriched titanium (alpha case) than do yttria slurries.
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Crego Ted R.
Kelly, III Thomas J.
Kemp William W.
Nikolas Douglas G.
Springgate Mark E.
Lin Kuang Y.
Precision Castparts Corporation
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