Effect of deposition conditions on the properties of pyrolytic SiC coatings for HTGR fuel particles
Silicon carbide coatings on HTGR microsphere fuel particles act as a barrier to contain metallic fission products. The present SiC coatings were applied by the decomposition of CH/sub 3/SiCl/sub 3/ in a 13-cm-diameter(5-in.) fluidized-bed coating furnace. The effects of temperature, CH/sub 3/SiCl/sub 3/ supply rate and the H/sub 2/:CH/sub 3/SiCl/sub 3/ ratio on coating properties were studied. Deposition temperature controlled coating density, whole-particle crushing strength, coating efficiency and microstructure. Coating density and microstructure were also partially determined by the H/sub 2/:CH/sub 3/SiCl/sub 3/ ratio. The results indicate that the rate at which high quality SiC can be deposited can be increased from 0.2 to 0.5 ..mu..m/min.
- Research Organization:
- Oak Ridge National Lab., TN
- OSTI ID:
- 6413847
- Journal Information:
- Am. Ceram. Soc. Bull.; (United States), Journal Name: Am. Ceram. Soc. Bull.; (United States) Vol. 57:6; ISSN ACSBA
- Country of Publication:
- United States
- Language:
- English
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ACTINIDE COMPOUNDS
ACTINIDES
CARBIDES
CARBON
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COATED FUEL PARTICLES
CRYSTAL STRUCTURE
DECOMPOSITION
DENSITY
DEPOSITION
DISPERSIONS
EFFICIENCY
ELEMENTS
FABRICATION
FISSION PRODUCT RELEASE
FISSION PRODUCTS
FUEL PARTICLES
GAS COOLED REACTORS
GRAIN SIZE
GRAPHITE MODERATED REACTORS
HTGR TYPE REACTORS
ISOTOPES
KRYPTON
METALS
MICROSTRUCTURE
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PYROLYSIS
PYROLYTIC CARBON
RADIOACTIVE MATERIALS
RARE GASES
REACTORS
SILICON CARBIDES
SILICON COMPOUNDS
SIZE
SURFACE COATING
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
URANIUM
URANIUM COMPOUNDS
URANIUM DIOXIDE
URANIUM OXIDES
XENON