Si--C--Al--O compound coatings on molybdenum for application to fusion reactor first wall components
The use of molybdenum protective plates coated with low-Z materials has been proposed in a certain conceptual design for fusion reactors. This study was an attempt to improve the thermal stability of rf reactive ion-plated SiC on molybdenum by adding a fraction of Al/sub 2/O/sub 3/ to the deposit. The coating was fabricated by directly evaporating a Si--Al/sub 2/O/sub 3/ mixture using an electron gun, with acetylene gas as the carbon source. The deposits were characterized by Auger electron spectroscopy, IR absorption spectroscopy, etc. Thermostability of the deposits up to 1200 /sup 0/C under vacuum was found to be excellent. The vaporization rate of Si, however, gradually increased around 1300 /sup 0/C. Thermocycling stability of the coatings in a low pressure hydrogen discharge was also evaluated. These results indicate that, due to the thermal stabilities, Si--C--Al--O deposits may be suitable for fusion reactor coating applications.
- Research Organization:
- National Research Institute for Metals, 1-2-1, Sengen, Sakuramura, Niiharigun, Ibaraki, Japan
- OSTI ID:
- 6350849
- Journal Information:
- J. Vac. Sci. Technol.; (United States), Journal Name: J. Vac. Sci. Technol.; (United States) Vol. 18:3; ISSN JVSTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
ABSORPTION SPECTROSCOPY
ACETYLENE
ALKYNES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AUGER ELECTRON SPECTROSCOPY
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COATINGS
COHERENT SCATTERING
DEPOSITION
DIFFRACTION
ELECTROMAGNETIC RADIATION
ELECTRON GUNS
ELECTRON SPECTROSCOPY
ELEMENTS
HIGH TEMPERATURE
HIGH VACUUM
HYDROCARBONS
INFRARED RADIATION
METALS
MOLYBDENUM
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
REFRACTORY METALS
SCATTERING
SILICON CARBIDES
SILICON COMPOUNDS
SPECTROSCOPY
STABILITY
SURFACE COATING
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION