Reaction mechanisms of silicon carbide fiber synthesis by heat treatment of polycarbosilane fibers cured by radiation. 1: Evolved gas analysis

Journal Article · Fri Mar 31 23:00:00 EST 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08430.x· OSTI ID:82595

Sugimoto, Masaki; Seguchi, Tadao ^[1]; Shimoo, Toship; Okamura, Kiyohito ^[1]

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1. Japan Atomic Energy Research Inst., Gunma (Japan). Takasaki Radiation Chemistry Research Establishment

SiC fibers were synthesized from polycarbosilane (PCS) fibers by heat treatment after electron beam irradiation curing. The pyrolysis reaction mechanisms from the organic PCS to ceramic SiC were investigated by the analysis of gases evolved during heat treatment. There were two steps in the major reaction: the first step was at 800--1,200 K where H{sub 2} and CH{sub 4} evolved by scission of Si-CH{sub 3} and Si-H and by rearrangement reactions, and the second step was at 1,000--1,700 K where H{sub 2} evolved by reactions related to C atoms in the PCS main chain. H{sub 2} evolution in the first step was reduced with increasing oxygen content in the cured PCS fibers.

• Sponsoring Organization: USDOE
• OSTI ID: 82595
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 4 Vol. 78; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUGER ELECTRON SPECTROSCOPY
ELECTRON BEAMS
ELECTRON SPECTROSCOPY
HYDROGEN
INFRARED SPECTRA
METHANE
MICROSTRUCTURE
NUCLEAR MAGNETIC RESONANCE
PYROLYSIS
RAMAN SPECTROSCOPY
SILANES
SILICON CARBIDES
SYNTHESIS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION