Colloidal spray method for low cost thin coating deposition
- San Jose, CA
- Livermore, CA
- Naperville, IL
A dense or porous coating of material is deposited onto a substrate by forcing a colloidal suspension through an ultrasonic nebulizer and spraying a fine mist of particles in a carrier medium onto a sufficiently heated substrate. The spraying rate is essentially matched to the evaporation rate of the carrier liquid from the substrate to produce a coating that is uniformly distributed over the surface of the substrate. Following deposition to a sufficient coating thickness, a single sintering step may be used to produce a dense ceramic coating. Using this method, coatings ranging in thickness from about one to several hundred microns can be obtained. By using a plurality of compounds in the colloidal suspension, coatings of mixed composition can be obtained. By using a plurality of solutions and separate pumps and a single or multiple ultrasonic nebulizer(s), and varying the individual pumping rates and/or the concentrations of the solutions, a coating of mixed and discontinuously graded (e.g., stepped) or continuously graded layers may be obtained. This method is particularly useful for depositing ceramic coatings. Dense ceramic coating materials on porous substrates are useful in providing improved electrode performance in devices such as high power density solid oxide fuel cells. Dense ceramic coatings obtained by the invention are also useful for gas turbine blade coatings, sensors, steam electrolyzers, etc. The invention has general use in preparation of systems requiring durable and chemically resistant coatings, or coatings having other specific chemical or physical properties.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- The Regents of the University of California (Oakland, CA)
- Patent Number(s):
- US 6358567
- OSTI ID:
- 874290
- Country of Publication:
- United States
- Language:
- English
YBa2Cu3O7−δ thin films deposited by an ultrasonic nebulization and pyrolysis method
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journal | April 1996 |
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journal | October 1991 |
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Related Subjects
spray
method
cost
coating
deposition
dense
porous
material
deposited
substrate
forcing
suspension
ultrasonic
nebulizer
spraying
fine
mist
particles
carrier
medium
sufficiently
heated
rate
essentially
matched
evaporation
liquid
produce
uniformly
distributed
surface
following
sufficient
thickness
single
sintering
step
ceramic
coatings
ranging
hundred
microns
obtained
plurality
compounds
mixed
composition
solutions
separate
pumps
multiple
nebulizers
varying
individual
pumping
rates
andor
concentrations
discontinuously
graded
stepped
continuously
layers
useful
depositing
materials
substrates
providing
improved
electrode
performance
devices
power
density
solid
oxide
fuel
cells
gas
turbine
blade
sensors
steam
electrolyzers
etc
preparation
systems
requiring
durable
chemically
resistant
specific
chemical
physical
properties
fuel cell
gas turbine
solid oxide
oxide fuel
coating material
colloidal suspension
carrier medium
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