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Ceramics 2018, 1(1), 128-138; https://doi.org/10.3390/ceramics1010011

Siloxane Precursor-Based Protective Coatings for High Modulus Carbon Fibers in Ceramic Matrix Composites

1
Institut für Fertigungstechnologie keramischer Bauteile, Universität Stuttgart, Allmandring 7b, D-70569 Stuttgart, Germany
2
Institut für Materialwissenschaft, Universität Stuttgart, Heisenbergstr. 3, D-70569 Stuttgart, Germany
*
Author to whom correspondence should be addressed.
Received: 15 May 2018 / Revised: 20 July 2018 / Accepted: 24 July 2018 / Published: 26 July 2018
(This article belongs to the Special Issue Advances in the Field of Nanostructured Ceramic Composites)
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Abstract

Carbon fibers are outstanding reinforcements for ceramic components due to their excellent creep and long-term thermochemical and thermomechanical stability. Nevertheless, these properties are dramatically downgraded if the unprotected fibers are exposed to an oxidative or corrosive environment. Thin ceramic coatings can improve the corrosion resistance and tailor the fiber/matrix interface in order to achieve optimized stress transfer and damage tolerance. The continuous liquid phase coating (CLPC) technique with subsequent pyrolysis is a promising alternative to chemical vapor deposition (CVD) processes. The possibility to deposit homogenous thin flaw-free coating layers on every filament of high tenacity carbon fiber bundles has been successfully proven in previous studies. In this work, high modulus carbon fibers were coated with different polysiloxane-based resins, and the obtained rovings were implemented in SiOC matrices by the precursor impregnation and pyrolysis (PIP) route. Thermogravimetric analysis shows an increased oxidation resistance of the coated fibers compared with reference samples. Enhanced fiber/matrix interface strength further improved the mechanical performance of the fabricated composites. View Full-Text
Keywords: ceramic matrix composites; carbon fibers; fiber/matrix interface; liquid phase impregnation; protective coatings ceramic matrix composites; carbon fibers; fiber/matrix interface; liquid phase impregnation; protective coatings
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Jiménez, M.; Samie, A.; Gadow, R.; Kern, F.; Bill, J. Siloxane Precursor-Based Protective Coatings for High Modulus Carbon Fibers in Ceramic Matrix Composites. Ceramics 2018, 1, 128-138.

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