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Use of impure inert gases in the controlled heating and cooling of mixed conducting metal oxide materials

United States Patent

8,246,719
August 21, 2012
View the Complete Patent at the US Patent & Trademark Office
Method for processing an article comprising mixed conducting metal oxide material. The method comprises contacting the article with an oxygen-containing gas and either reducing the temperature of the oxygen-containing gas during a cooling period or increasing the temperature of the oxygen-containing gas during a heating period; during the cooling period, reducing the oxygen activity in the oxygen-containing gas during at least a portion of the cooling period and increasing the rate at which the temperature of the oxygen-containing gas is reduced during at least a portion of the cooling period; and during the heating period, increasing the oxygen activity in the oxygen-containing gas during at least a portion of the heating period and decreasing the rate at which the temperature of the oxygen-containing gas is increased during at least a portion of the heating period.
Carolan; Michael Francis (Allentown, PA), Bernhart; John Charles (Fleetwood, PA)
Air Products and Chemicals, Inc. (Allentown, PA)
12/ 567,167
September 25, 2009
RESEARCH OR DEVELOPMENT This invention was made with Government support under Cooperative Agreement No. DE-FC26-98FT40343 between Air Products and Chemicals, Inc. and the U.S. Department of Energy. The Government has certain rights to this invention.