Preparation of silicon carbide from organosilicon gels: II. Gel pyrolysis and SiC characterization

Journal Article · Thu Jan 01 04:00:00 EST 1987 · Advanced Ceramic Materials; (USA)

DOI:https://doi.org/10.1111/j.1551-2916.1987.tb00053.x· OSTI ID:6363652

White, D A; Oleff, S M; Fox, J R ^[1]

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1. Standard Oil Research and Development Center, Warrensville Heights, OH (USA)

The controlled pyrolysis of polymeric organosilicon gels has been investigated as a means of preparing high-purity, high-surface-area SiC powders. The preparation of the gels, which have the ideal formula (RSiO{sub 1.5}){sub n}, has been summarized in Part I. Part II will examine the decomposition behavior of the gels under an inert atmosphere. The pyrolysis products are best described as a partially crystalline, partially amorphous mixture of {beta}-SiC, SiO{sub 2}, and C. Surface area in excess of 600 m{sup 2}/g have been obtained for the as-fired products and in excess of 800 m{sup 2}/g for residues purified to remove excess C and/or SiO{sub 2}. The effect of the degree of unsaturation and the carbon chain length of the R group as well as the effect of crosslinking in the starting gel on the composition and the surface area of the products has been determined. The origin of the high surface area of the products has been identified and its implication on potential uses of these materials is discussed.

• OSTI ID: 6363652
• Journal Information: Advanced Ceramic Materials; (USA), Journal Name: Advanced Ceramic Materials; (USA) Vol. 2:1; ISSN 0883-5551; ISSN ACEME
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CARBIDES
CARBON COMPOUNDS
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COHERENT SCATTERING
COLLOIDS
DATA
DECOMPOSITION
DIFFRACTION
DISPERSIONS
EXPERIMENTAL DATA
GELS
GRAVIMETRIC ANALYSIS
INFORMATION
INORGANIC POLYMERS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
POLYMERS
PYROLYSIS
QUANTITATIVE CHEMICAL ANALYSIS
SCATTERING
SILICON CARBIDES
SILICON COMPOUNDS
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES
X-RAY DIFFRACTION