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.
Highlights
The superior mechanical and tribological performance qualifies ceramic matrix composites (CMC)for high-temperature applications in aerospace and automotive sectors [1,2,3]
An environmental barrier coating (EBC) of an appropriate combination of refractory materials [7,8] is typically introduced in carbon fiber-reinforced ceramics
The SEM images of the coated fibers prove the deposition of a thin ceramic layer on every single filament of the rovings
Summary
The superior mechanical and tribological performance qualifies ceramic matrix composites (CMC)for high-temperature applications in aerospace and automotive sectors [1,2,3]. Carbon fibers are a reinforcement of special interest due to their remarkable strength and stiffness at high temperatures and affordable costs These properties cannot be sustained if they are exposed to an oxidative atmosphere. Carbon-based composites show significant degradation in air above 400 ◦ C This is an important limiting factor for their introduction as high-temperature lightweight structural components in the aerospace industry, such as aircraft engine parts or thermal protection for spacecraft. For this reason, an environmental barrier coating (EBC) of an appropriate combination of refractory materials [7,8] is typically introduced in carbon fiber-reinforced ceramics
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