Pyrolytic gas method of coating graphitic or ceramic articles wi

Details Pyrolytic gas method of coating graphitic or ceramic articles wi Pyrolytic gas method of coating graphitic or ceramic articles wi

1978-08-16

1981-04-14

Beck, Shrive P.

Coating processes

Particles, flakes, or granules coated or encapsulated

Solid encapsulation process utilizing an emulsion or...

176 91SP, 427 6, 427215, 427249, B05D 308

Patent

active

042620392

ABSTRACT:
A portion of the feed gas is supplied in a pulsating fashion to a fluidized ed reactor containing the articles to be coated mixed with fluidizing particles. The pulse frequency is between 1 and 10 Hz. A continuous flow of a portion of the total gas supply at a rate insufficient to produce turbulence in the bed is provided to facilitate control of the pulsing frequency and reduce the energy necessary for the pulsating gas stream. The gases fed to the reactor are a coating gas and a carrier gas, the flow containing the coating gas including a portion of the carrier gas. Either the pulsed flow or the continuous flow may consist entirely of carrier gas. The fluidizing particles are preferably of the same material as the articles to be coated and are typically of a grain size between 2 and 3 mm.

REFERENCES:
patent: 3399969 (1968-09-01), Bokros et al.
patent: 3547676 (1970-12-01), Bokros et al.
patent: 3682759 (1972-08-01), Beutler et al.
patent: 3799790 (1974-03-01), Schulz et al.
patent: 3940514 (1976-02-01), Baker et al.
patent: 3977896 (1976-08-01), Bokros et al.
patent: 3997689 (1976-12-01), Heruert
patent: 4016304 (1977-04-01), Beatty et al.
patent: 4028181 (1977-06-01), Huschka et al.
patent: 4056641 (1977-11-01), Huschka et al.

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