|About this Abstract
||MS&T22: Materials Science & Technology
||Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
||H-6: Carbon Fiber-reinforced CMCs for Ultra-high Temperature Applications
||Shakir Bin Mujib, Sonjoy Dey, Gurpreet Singh
|On-Site Speaker (Planned)
||Shakir Bin Mujib
The feasibility of coating commercial carbon fibers with polysilazane preceramic polymers are demonstrated. Pyrolysis of functionalized C-fibers leads to the formation of polymer-derived SiCN/CF composites, which was confirmed by SEM and X-ray based spectroscopy. The effect of SiCN content on microstructure and mechanical properties of the composites was investigated. High amount of ceramic yield was observed for the samples prepared in Ar environment. The high amount of surface oxygen was observed in the ceramic-coated fibers after oxidation test at 800-1500 °C, however all the samples retained ceramic coatings on the surface. The PDC coated fiber mats were observed to be resistant to oxidation resistance until at least 1500 °C. The fracture strength of the uncoated c-fibers was also improved after SiCN deposition. The ultimate bending strength and flexural modulus of the SiCN/CF composites were measured to be 236 MPa and 83 GPa, respectively.