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Polycrystalline SiC fibers from organosilicon polymersVarious organosilicon polymers have been converted into small diameter, fine-grained silicon carbide fibers by melt spinning, crosslinking, and pyrolyzing to greater than 1600 C. The high pyrolysis temperature densifies the fiber and causes CO evolution which removes nearly all oxygen. An additive prevents the loss of strength normally associated with such treatments. Silicon carbide fibres with up to 2.6 GPa (380 ksi) tensile strength, greater than 420 GPa (greater than 60 Msi) elastic modulus, and 3.1-3.2 mg/cu m density have been prepared via this process. Their microstructure consists of greater than 95 wt pct B-SiC crystallites averaging 30-40 nm diameter, with varying amounts of graphitic carbon between the SiC grains. Under inert conditions, the fibers can be thermally aged at least 12 h/1800 C with minimal change in properties.
Document ID
19910072334
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lipowitz, Jonathan
(Dow Corning Corp. Midland, MI, United States)
Rabe, James A.
(Dow Corning Corp. Midland, MI, United States)
Zank, Gregg A.
(Dow Corning Corp. Midland, MI, United States)
Date Acquired
August 14, 2013
Publication Date
October 1, 1991
Publication Information
Publication: Ceramic Engineering and Science Proceedings
Volume: 12
ISSN: 0196-6219
Subject Category
Nonmetallic Materials
Accession Number
91A56957
Funding Number(s)
CONTRACT_GRANT: NAS3-25641
Distribution Limits
Public
Copyright
Other

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