Carbothermal synthesis of silicon carbide

Technical Report · Wed May 01 04:00:00 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
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ARGON
CARBIDES
CARBOHYDRATES
CARBON
CARBON BLACK
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COLLOIDS
DATA
DENSITY
DIAGRAMS
DISACCHARIDES
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
FLOWSHEETS
FLUIDS
GASES
GELS
HOT PRESSING
HYDROGEN
INFORMATION
MATERIALS WORKING
MINERALS
MORPHOLOGY
NITROGEN
NONMETALS
NUMERICAL DATA
OLIGOSACCHARIDES
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PHYSICAL PROPERTIES
PITCHES
PRESSING
QUARTZ
RARE GASES
REDUCTION
SACCHARIDES
SACCHAROSE
SILICA
SILICON CARBIDES
SILICON COMPOUNDS
SILICON OXIDES
SINTERING
SIZE
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS
VERY HIGH TEMPERATURE