Polymer-derived ceramic fibers and methods of preparing the same
AssigneeKansas State University Research Foundation
InventorsGurpreet Singh, Zhongkan Ren
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Abstract
Ceramic matrix composite (CMC) materials are a desired solution for lightweight and high temperature applications. CMC materials can be reinforced with polymer-derived ceramic (PDC) fibers, which advantageously possess intrinsic thermal stability and high mechanical strength. Carbon-rich SiOC and SiOCN fibers were synthesized via hand-drawing and electrospinning polymer pyrolysis of a hybrid precursor materials with the aid of a spinning reagent. The prepared fibers are crosslinked and pyrolyzed for polymer-to-ceramic conversion.
Claims19
A method of producing ceramic fiber materials comprising:
- forming a reaction mixture comprising a liquid preceramic composition and a spinning reagent;
- spinning preceramic polymer fibers from the reaction mixture;
- crosslinking the preceramic polymer fibers to form crosslinked preceramic polymer fibers;
- and
- pyrolyzing the crosslinked preceramic polymer fibers to form the ceramic fiber materials.
A method of producing silicon oxycarbide fibers comprising:
- forming a reaction mixture comprising a liquid preceramic composition and a spinning reagent, the liquid preceramic composition comprising a siloxane and/or a silazane, the spinning reagent comprising polyacrylic acid, polyvinylpyrrolidone, and/or polyacrylonitrile;
- spinning preceramic polymer fibers from the reaction mixture using a wet spinning, a melt spinning, a gel spinning, or an electrospinning process;
- heating the preceramic polymer fibers to form crosslinked preceramic polymer fibers;
- and
- pyrolyzing the crosslinked preceramic polymer fibers to form the silicon oxycarbide fibers.
A ceramic fiber material comprising:
- from about 1% to about 90% by weight silicon;
- from about 1% to about 90% by weight oxygen;
- and
- from about 1% to about 90% by weight carbon, wherein at least a portion of the carbon is present as free carbon,
- wherein the ceramic fiber material comprises a plurality of ceramic fibers having a average diameter of from about 0.1 to about 50 μm.
Dependencies are inferred from the claim text.