skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Method for depositing a uniform layer of particulate material on the surface of an article having interconnected porosity

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.

Inventors:
;
Issue Date:
OSTI Identifier:
5708112
Application Number:
ON: DE83018040
Assignee:
ERA-08-054369; EDB-83-178029
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 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)

Citation Formats

Wrenn, G.E. Jr., and Lewis, J. Jr. Method for depositing a uniform layer of particulate material on the surface of an article having interconnected porosity. United States: N. p., 1982. Web.
Wrenn, G.E. Jr., & Lewis, J. Jr. Method for depositing a uniform layer of particulate material on the surface of an article having interconnected porosity. United States.
Wrenn, G.E. Jr., and Lewis, J. Jr. Wed . "Method for depositing a uniform layer of particulate material on the surface of an article having interconnected porosity". United States.
@article{osti_5708112,
title = {Method for depositing a uniform layer of particulate material on the surface of an article having interconnected porosity},
author = {Wrenn, G.E. Jr. and Lewis, J. Jr.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {9}
}