Carbothermal synthesis of silicon carbide

Technical Report · Wed May 01 00:00:00 EDT 1985

OSTI ID:5679139

Janney, M A; Wei, G C; Kennedy, C R; Harris, L A

Silicon carbide powders were synthesized from various silica and carbon sources by a carbothermal reduction process at temperatures between 1500 and 1600/sup 0/C. The silica sources were fumed silica, methyltrimethoxysilane, and microcrystalline quartz. The carbon sources were petroleum pitch, phenolic resin, sucrose, and carbon black. Submicron SiC powders were synthesized. Their morphologies included equiaxed loosely-bound agglomerates, equiaxed hard-shell agglomerates, and whiskers. Morphology changed with the furnace atmosphere (argon, nitrogen, or nitrogen-4% hydrogen). The best sintering was observed in SiC derived from the fumed-silica-pitch and fumed-silica-sucrose precursors. The poorest sintering was observed in SiC derived from microcrystalline quartz and carbon black. 11 refs., 16 figs., 10 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5679139
• Report Number(s): ORNL-6169; ON: DE85013546
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SILICON CARBIDES
CHEMICAL COMPOSITION
DENSITY
HOT PRESSING
MORPHOLOGY
PARTICLE SIZE
SURFACE AREA
SYNTHESIS
ARGON
CARBON BLACK
EXPERIMENTAL DATA
FLOWSHEETS
GELS
HYDROGEN
NITROGEN
PITCHES
QUARTZ
REDUCTION
SACCHAROSE
SILICA
SINTERING
VERY HIGH TEMPERATURE
CARBIDES
CARBOHYDRATES
CARBON
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COLLOIDS
DATA
DIAGRAMS
DISACCHARIDES
DISPERSIONS
ELEMENTS
FABRICATION
FLUIDS
GASES
INFORMATION
MATERIALS WORKING
MINERALS
NONMETALS
NUMERICAL DATA
OLIGOSACCHARIDES
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSING
RARE GASES
SACCHARIDES
SILICON COMPOUNDS
SILICON OXIDES
SIZE
SURFACE PROPERTIES
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication