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:
-
- (Clinton, TN)
- (Oak Ridge, TN)
- Issue Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- OSTI Identifier:
- 865035
- Patent Number(s):
- 4452832
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B05 - SPRAYING OR ATOMISING IN GENERAL B05D - PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
- 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 = {Sun Jan 01 00:00:00 EST 1984},
month = {Sun Jan 01 00:00:00 EST 1984}
}