Patent ID: 7487819

Claim:
A method comprising: injecting into a thin wall disposable core die a slurry having a viscosity of about 1to about 1,000 Pascal-seconds at room temperature when tested at a shear rate of up to 70 seconds −1 and a flow index of less than 0.6; the injecting being carried out at a hydrostatic pressure of about 0.07 to about 7 kilograms per centimeter square; wherein the thin wall disposable core die has an average wall thickness of about 1.5 to about 10 millimeters; restoring the thin wall disposable core die to its original position upon the removal of the hydrostatic pressure; curing the slurry to form a cured ceramic core; removing the thin wall disposable core die from the cured ceramic core; and firing the cured ceramic core to form a solidified ceramic core.