Process for diffusing metallic coatings into ceramics to improve their voltage withstanding capabilities
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsH. Craig Miller, Herbert F. Zuhr
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Abstract
The disclosure relates to a method for diffusing a coating of manganese powder and titanium powder into a ceramic to improve its voltage hold off withstanding capability. The powder coated ceramic is fired for from about 30 to about 90 minutes within about one atmosphere of wet hydrogen at a temperature within the range of from about 1450.degree. to about 1520.degree. C to cause the mixture to penetrate into the ceramic to a depth on the order of a millimeter.
Claims6
A method for penetratingly covering an alumina ceramic insulator with metal so that the metal is diffused into the surface of the insulator a preselected amount, the method comprising:
- coating the insulator with a mixture comprising manganese powder and titanium powder, the manganese and titanium powder mixture ranging from about two parts by metal weight of manganese and five parts by metal weight of titanium to about seven parts by metal weight of manganese and one part by metal weight of titanium, the manganese and titanium together constituting essentially 100% of the metal present in the mixture;
- and firing the coated insulator for about 30 to about 90 minutes in about one atmosphere of wet hydrogen at a temperature of from about 1450.degree. to about 1520.degree. C to cause the mixture to penetrate into the ceramic from a depth of from about one tenth millimeter to about three millimeters.
Dependencies are inferred from the claim text.