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:
 [1];  [2]
  1. (Clinton, TN)
  2. (Oak Ridge, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
865035
Patent Number(s):
4452832
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; depositing; uniform; layer; particulate; material; surface; article; interconnected; porosity; liquid-suspended; particles; immersed; porous; characterized; form; coating; conducted; vessel; containing; organic; liquid; supporting; colloidal; dispersion; graphite; sized; lodge; pores; comprises; volatile; component; acetone; less-volatile; toluene; dissolved; graphite-bonding; agent; contains; cellulose; gum; maintaining; suspension; carbon; coated; permeated; therewith; stirred; maintain; blend; headspace; evacuated; effect; flashing-off; interior; causes; particle-laden; exterior; flow; inwardly; lodging; forming; continuous; retrieved; heated; resin-bond; smooth; adherent; various; materials; articles; rapid; reproducible; porous carbon; vessel head; bonding agent; particulate material; organic liquid; vessel containing; uniform layer; various materials; suspended particles; coated article; volatile component; various material; continuous coating; /427/

Citation Formats

Wrenn, Jr., George E., and Lewis, Jr., John. Method for depositing a uniform layer of particulate material on the surface of an article having interconnected porosity. United States: N. p., 1984. Web.
Wrenn, Jr., George E., & Lewis, Jr., John. Method for depositing a uniform layer of particulate material on the surface of an article having interconnected porosity. United States.
Wrenn, Jr., George E., and Lewis, Jr., John. Sun . "Method for depositing a uniform layer of particulate material on the surface of an article having interconnected porosity". United States. https://www.osti.gov/servlets/purl/865035.
@article{osti_865035,
title = {Method for depositing a uniform layer of particulate material on the surface of an article having interconnected porosity},
author = {Wrenn, Jr., George E. and Lewis, Jr., John},
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 = {1984},
month = {1}
}

Patent:

Save / Share: