Method of encapsulating a molded ceramic member
AssigneeMotoren- und Turbinen-Union Munchen GmbH
InventorsWolfgang Betz, Axel Rossmann
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Abstract
For the encapsulation of a molded ceramic member for high-temperature isostatic pressing, the molded member, which preferably is of silicon ceramic, is covered with a dense surface coating of an Si melt. Thereafter, the coating is exposed to an N.sub.2 atmosphere at a temperature of within about 800.degree. to 1400.degree. C. for so long until the Si coating is converted into a Si.sub.3 N.sub.4 coating.
Claims4
In a method for encapsulating a molded member of ceramic, such as silicon ceramic for high-temperature isostatic pressing;
- the improvement comprising coating said molded member with a dense surface coating of Si melt;
- and thereafter exposing said coating to an N.sub. 2 atmosphere at a temperature in the range of about 800.degree. C. to 1400.degree. C. until the Si coating is converted into a Si.sub. 3N.sub. 4 coating.
Method as claimed in any one of the preceding claims, comprising adding about 1% to 10% Mg0 to the Si melt so as to improve the viscosity thereof.
Dependencies are inferred from the claim text.