Plasma-arc ceramic coating of non-conductive surfaces
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United States of America Patent
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Mar 5, 1991
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N/A
app pub date -
Jun 2, 1989
filing date -
Jun 2, 1989
priority date (Note) -
Expired
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Abstract
For high temperature applications, ceramic coatings are plasma-sprayed onto various substrates. Plasma-spraying of ceramics onto non-conductive polymer surfaces often results in coatings which are poorly adherent. Adherent, non-spalling, ceramic layers can be achieved by first coating the non-conductive surface with an adhesively bonded, more conductive layer. It is postulated that the resulting more conductive coating is sufficient to prevent the build-up of electrostatic charges which can act to repel the plasma-sprayed particles. After the more conductive layer is applied (a bond coat may be employed, but is generally unnecessary), the ceramic powders are plasma-sprayed.
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