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Fully plasma-sprayed compliant backed ceramic turbine seal (1982)

Wisander, D. W. ; Bill, R. C.

In: CASI

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Publication Date: 2019-06-28

Description: A seal having a high temperature abradable lining material encircling the tips of turbine blades in turbomachinery is discussed. The minimum operating clearances between the blade tips and the lining of a high pressure turbine are maintained. A low temperature easily decomposable material, such as a polymer, in powder form is blended with a high temperature oxidation resistant metal powder. The two materials are simultaneously deposited on a substrate formed by the turbine casing. Alternately, the polymer powder may be added to the metal powder during plasma spraying. A ceramic layer is then deposited directly onto the metal polymer composite. The polymer additive mixed with the metal is then completely volatilized to provide a porous layer between the ceramic layer and the substrate.

Keywords: NONMETALLIC MATERIALS

Format: application/pdf

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