Evaluation of oxidation resistance of thin continuous silicon oxycarbide fiber derived from silicone resin with low carbon content

Evaluation of oxidation resistance of thin continuous silicon oxycarbide fiber derived from silicone resin with low carbon content

Si–O–C ceramic fiber was synthesized from a kind of silicone resin with low carbon content. The melt-spun resin fiber was exposed to SiCl 4 vapor under a nitrogen gas flow, and the fiber was heated at 373 K for 2 h to complete the curing process. The cured fiber was pyrolyzed at 1273 K in an inert a...

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Bibliographic Details
Published in:Journal of materials science Vol. 45; no. 20; pp. 5642 - 5648
Main Authors: Narisawa, Masaki, Sumimoto, Ryu’ichi, Kita, Ken’ichiro
Format: Journal Article
Language:English
Published: Boston Springer US 01-10-2010
Springer
Springer Nature B.V
Subjects:
Air flow
Augers
Carbon content
Ceramic fibers
Ceramic materials
Ceramics
Characterization and Evaluation of Materials
Chemical composition
Chemistry and Materials Science
Classical Mechanics
Continuous fibers
Crystallization
Crystallography and Scattering Methods
Curing
Fibers
Flow resistance
Gas flow
Heat treatment
Inert atmospheres
Materials Science
Melt spinning
Organic chemistry
Oxidation
Oxidation resistance
Oxidation-reduction reaction
Oxycarbides
Polymer Sciences
Resins
Silica
Silicon
Silicon dioxide
Silicon tetrachloride
Silicone resins
Silicones
Solid Mechanics
Spectrum analysis
Fiber Surface
Silica Layer
Cristobalite
SiCl4
Silica Fiber
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Summary:Si–O–C ceramic fiber was synthesized from a kind of silicone resin with low carbon content. The melt-spun resin fiber was exposed to SiCl 4 vapor under a nitrogen gas flow, and the fiber was heated at 373 K for 2 h to complete the curing process. The cured fiber was pyrolyzed at 1273 K in an inert atmosphere to be converted to Si–O–C fiber. The entire chemical composition of the pyrolyzed fiber was almost identical to that of a previously reported resin which was pyrolyzed without curing. Auger spectrum analysis indicated an increase in silicon content near the fiber surface. The Si–O–C fiber thus obtained was heat-treated at 1511 or 1603 K in an air flow to evaluate oxidation resistance. Elemental analysis, XRD measurement, and SEM image observations were carried out on the oxidized Si–O–C fibers. Even with such thin fiber diameters, the oxidation process under these conditions was slow and the formation of a thin oxide layer on the fiber surface was confirmed. The existence of a residual Si–O–C core surrounded by a crystallized silica layer was observed in fractured fiber cross-sections after severe treatment conditions of 24 h oxidation at 1511 K or 3 h oxidation at 1603 K.
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content type line 23
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-010-4629-7