CERAMIC COMPOSITES, INC.A subsidiary of Technology Assessment & Transfer, Inc.
Chemical vapor deposition (CVD) coatings are omni-directional, thick coatings that produces their own rough surface morphology. Coating thickness are typically a few to several mils, requiring grinding and polishing to achieve a smooth surface finish. CVD coatings are deposited under mild vacuum conditions at moderate (500 °F-800 °F) to high temperatures (1800 °F or higher) depending on whether the gaseous precursor starting materials are metal-organic or inorganic. Polymer substrates and low temperature metal parts are not good candidates for CVD coatings. Purities and densities are typically lower than sputtered films.
A list of the primary metallic and ceramic coatings and some of their applications are listed in Table below.
| Coating |
Application(s) |
Comments |
|
Rhenium |
Rocket motors, X-Ray targets |
Protection of C/C high 2, high temp. |
|
Niobium |
Rocket motors |
Attachment for E Beam welding |
|
Tungsten |
X-Ray targets |
|
|
Hafnium |
Rocket motors |
|
|
Carbon |
Fiber DeBond coating |
|
|
SiC |
Surface coating for CMC parts |
CMC components for oxidation protection |
|
SiO2 |
Surface coating |
Compatibility with SiC structures substrate |
|
TiO2 |
DeBond coating for SiC fibers |
Part of multilayer structure |
|
HfC |
Surface coating for CMC |
Ultra high temp application |
|
TaC |
Surface coating for CMC |
Ultra high temp application |
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