Method for depositing a uniform layer of particulate material on the surface of an article having interconnected porosity
- (Clinton, TN)
- (Oak Ridge, TN)
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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4452832
- OSTI ID:
- 865035
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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
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