Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1985-09-30
1987-01-27
Marquis, Melvyn I.
Coating processes
With post-treatment of coating or coating material
Heating or drying
428413, 428418, 524439, 524701, 523445, B05D 302
Patent
active
046393854
ABSTRACT:
A conformal coating protects electrical components used in a high voltage high vacuum evironment from flashovers caused by patch charging. The coating comprises a semiconductor powder, preferably elemental boron, having a low atomic number and uniformly dispersed throughout an organic binder such an an epoxy. The coating's surface resistivity is made to be high enough so that the coating acts as an electrical insulator. On the other hand, the coating's surface resistivity is sufficiently low that any patch charge is siphoned off to the nearest conductor. The surface resistivity is regulated by the proportion of semiconductor present. The coating's secondary electron emission coefficient is 1 or just under 1. The coating has the properties of adhesion, stability, elasticity, provision of mechanical support, and resistance to solvents and heat. An example is given in which the epoxy comprises resin, fine particles of elemental boron, and a polyamide hardener. The epoxy is mixed with solvents and sprayed or brushed onto the electrical components being protected, in this case a satellite TWTA EPC.
REFERENCES:
patent: 3649542 (1969-01-01), Hasebe et al.
patent: 3779988 (1973-12-01), Rembold et al.
patent: 3843675 (1974-10-01), Porret et al.
patent: 3936574 (1976-02-01), Marin
patent: 3947373 (1976-03-01), Sobajima et al.
Sudarshan, T. S., et al, "The Effect of Chromium Oxide Coatings on Surface Flashover of Alumina Spacers in Vacuum" IEEE Transactions on Electrical Insulation, vol. EI-11, No. 1, Mar. 1976, pp. 32-36.
Jolitz William L.
Williams Richard A.
Ford Aerospace & Communications Corporation
Marquis Melvyn I.
Radlo Edward J.
Sadler Clifford L.
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