Synthesis of sinterable SiC powders by carbothermic reduction of gel-derived precursors; and pyrolysis of polycarbosilane

Journal Article · Wed Aug 01 00:00:00 EDT 1984 · Am. Ceram. Soc. Bull.; (United States)

OSTI ID:6305449

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

Silicon carbide powders were synthesized by 1) carbothermic reduction of carbon-doped silica gel derived from colloidal silica or methyltrimethoxysilane and 2) pyrolysis of polymeric SiC precursors. Powder characteristics, including sinterability, depended on the type and composition of the precursor. The colloidal silica-sucrose and -pitch SiC powders doped with boron and carbon were sintered to 95% to 96% of theoretical density at 2100C in argon. The microstructures of these sintered SiC bodies consisted of mixtures of elongated grains (up to 50 m) and equiaxed grains (approx. = 10 m) with residual pores (up to 8 m) at grain boundaries or inside grains. 12 references, 7 figures, 2 tables.

• Research Organization: Oak Ridge National Lab., TN
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6305449
• Journal Information: Am. Ceram. Soc. Bull.; (United States), Vol. 63:8; Conference: 84. annual meeting of the American Ceramic Society, Chicago, IL, USA, 26 Apr 1983
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
POWDERS
CHEMICAL PREPARATION
SILICON CARBIDES
BORON
CARBON
COLLOIDS
DOPED MATERIALS
EXPERIMENTAL DATA
SILANES
SILICA
SINTERED MATERIALS
SINTERING
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
DATA
DISPERSIONS
ELEMENTS
FABRICATION
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
MATERIALS
MINERALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SEMIMETALS
SILICON COMPOUNDS
SILICON OXIDES
SYNTHESIS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication