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Method for removing volatile components from a ceramic article, and related processes

United States Patent

April 9, 2002
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A method of removing substantially all of the volatile component in a green, volatile-containing ceramic article is disclosed. The method comprises freezing the ceramic article; and then subjecting the frozen article to a vacuum for a sufficient time to freeze-dry the article. Frequently, the article is heated while being freeze-dried. Use of this method efficiently reduces the propensity for any warpage of the article. The article is often formed from a ceramic slurry in a gel-casting process. A method for fabricating a ceramic core used in investment casting is also described.
Klug; Frederic Joseph (Schenectady, NY), DeCarr; Sylvia Marie (Waterford, NY)
General Electric Company (Schenectady, NY)
09/ 499,121
February 7, 2000
The U.S. Government may have certain rights in this invention pursuant to contract number DEAC 05-960R22464, awarded by the U.S. Department of Energy.