Plasma-arc ceramic coating of non-conductive surfaces

Details Plasma-arc ceramic coating of non-conductive surfaces Plasma-arc ceramic coating of non-conductive surfaces

1989-06-02

1991-03-05

Beck, Shrive

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427 34, 427404, 428472, 428323, B05D 110

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active

049977040

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.

REFERENCES:
patent: 3179531 (1965-04-01), Koubek
patent: 4578310 (1986-03-01), Hatfield
patent: 4883703 (1989-11-01), Riccio

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