Nonoxide ceramic powder synthesis

Conference · Sun Jan 01 04:00:00 EST 1995 · Combustion and Flame; (United States)

OSTI ID:6806497

Gerhold, B W; Inkrott, K E ^[1]

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1. Phillips Petroleum Co., Bartlesville, OK (United States)

SiC was synthesized by injecting mixtures of carrier gas plus a silicon compound (Si(CH[sub 3])[sub 4], SiCH[sub 4]) into hot burned gas downstream of a fuel rich hydrocarbon-oxygen flame. The gas temperature during ceramic synthesis was measured at 1,500--1,650 C. Reaction stoichiometry was investigated by changing the carrier gas injected with the silicon compound. Both experimental data and equilibrium calculations show that SiC is stable in mixtures of CO and H[sub 2] at synthesis temperature. However, CO[sub 2] addition to the synthesis zone causes silicon oxidation to SiO[sub 2] with little SiC formation. Flame stoichiometry shows the same influence: mixtures around a molar C/O = 1, where the burned gas is CO and H[sub 2], favor ceramic synthesis. Richer flames are cooler and produce excessive soot while leaner flames produce H[sub 2]O and CO[sub 2] which oxidize silicon species. Two key results give guidance about the ceramic formation mechanism: (1) In these experiments silicon species do not equilibrate with the gas species. (2) SiC forms from reaction of SiH[sub 4] + C[sub 2]H[sub 4], which shows silicon species both breaking and forming chemical bonds during the reaction process. This result opens the possibility of a gas phase kinetic mechanism for ceramic powder formation. In general, these experiments present a new combustion driven material synthesis route that may apply to a variety of compounds.

• OSTI ID: 6806497
• Report Number(s): CONF-940711--
• Conference Information: Journal Name: Combustion and Flame; (United States) Journal Volume: 100:1-2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKENES
CARBIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COCOMBUSTION
COMBUSTION
ELEMENTS
ETHYLENE
HYDRIDES
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
KINETICS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SILANES
SILICON CARBIDES
SILICON COMPOUNDS
SYNTHESIS
THERMOCHEMICAL PROCESSES