Method for depositing a uniform layer of particulate material on the surface of an article having interconnected porosity
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.
- DOE Contract Number:
- W-7405-ENG-26
- Assignee:
- ERA-08-054369; EDB-83-178029
- Application Number:
- ON: DE83018040
- OSTI ID:
- 5708112
- Country of Publication:
- United States
- Language:
- English
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Method for depositing a uniform layer of particulate material on the surface of an article having interconnected porosity
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Related Subjects
POROUS MATERIALS
SURFACE COATING
SUSPENSIONS
DEPOSITION
ACETONE
GRAPHITE
LOW PRESSURE
RESINS
TOLUENE
AROMATICS
CARBON
DISPERSIONS
ELEMENTAL MINERALS
ELEMENTS
HYDROCARBONS
KETONES
MATERIALS
MINERALS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
420100* - Engineering- General Engineering- (-1987)