Method for sealing a porous layer at the surface of a body, in particular for the sealing of a thermal spray layer
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United States of America Patent
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Issued Date -
Jun 14, 2001
app pub date -
Dec 6, 2000
filing date -
Dec 13, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The method serves for the sealing of porous layers (10) at body surfaces (11), in particular of thermal spray layers of a ceramic coating material. Communicating capillary spaces (12) in the layer (10) have openings at the surface (11). A liquid (2) is used as a sealing medium which consists of a solvent and at least one oxidizable metal which is contained therein. The method comprises the following steps: a) application (3) of the sealing medium to the body surface and waiting for a penetration of the liquid into the capillary spaces, b) input of heat (4) for the evaporation of the solvent component and for the oxidation of the metal at a temperature which is greater than a conversion temperature which depends on the oxidizable metal, c) if required, an at least partial removal (5) of a deposit on the original surface which is formed by solid residues of the sealing medium, and d) a single or multiple repetition of the application (3, 4, 5) which is defined by the steps a) to c), with the same or with a different sealing medium.
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