Coating processes – With post-treatment of coating or coating material – Vacuum or reduced pressure utilized
Patent
1982-09-29
1984-06-05
Lusignan, Michael R.
Coating processes
With post-treatment of coating or coating material
Vacuum or reduced pressure utilized
4273855, 4274301, B05D 118, B05D 302, B05D 312
Patent
active
044528329
ABSTRACT:
The invention is a method for depositing liquid-suspended particles on an immersed porous article characterized by interconnected porosity. In one form of the invention, coating is conducted in a vessel containing an organic liquid supporting a colloidal dispersion of graphite sized to lodge in surface pores of the article. The liquid comprises a first volatile component (e.g., acetone) and a second less-volatile component (e.g., toluene) containing a dissolved organic graphite-bonding agent. The liquid also contains an organic agent (e.g., cellulose gum) for maintaining the particles in suspension. A porous carbon article to be coated is immersed in the liquid so that it is permeated therewith. While the liquid is stirred to maintain a uniform blend, the vessel headspace is evacuated to effect flashing-off of the first component from the interior of the article. This causes particle-laden liquid exterior of the article to flow inwardly through its surface pores, lodging particles in these pores and forming a continuous graphite coating. The coated article is retrieved and heated to resin-bond the graphite. The method can be used to form a smooth, adherent, continuous coating of various materials on various porous articles. The method is rapid and reproducible.
REFERENCES:
patent: 3577344 (1971-05-01), Ardary et al.
patent: 4062991 (1977-12-01), Kyte et al.
patent: 4201611 (1980-05-01), Stover
Lewis, Jr. John
Wrenn, Jr. George E.
Esposito Michael F.
Hamel Stephen D.
Lewis Fred O.
Lusignan Michael R.
The United States of America as represented by the United States
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