About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|
| Presentation Title |
L-3: SiC Fiber-reinforced CMCs: Towards High-temperature Structural Materials |
| Author(s) |
Mohammed Rasheed, Shakir Bin Mujib, Gurpreet Singh |
| On-Site Speaker (Planned) |
Mohammed Rasheed |
| Abstract Scope |
Ceramic matrix composites (CMCs) are suitable candidates for aerospace components due to their lightweight structure, high mechanical strength, and high temperature stability. Here, SiCN/SiC, Si(B)CN/SiC, and Si(Hf)CN/SiC CMC mini-composites were fabricated with SiC fiber reinforcement using polysilazane-based single-source liquid precursors. A polysilazane-based precursor was mixed with boron and hafnium containing precursors to synthesize Si(B)CN and Si(Hf)CN polymeric precursors. The coated Fibers were cross-linked at 180 °C for 16 h and later pyrolyzed at 800 °C for 30 min in an inert atmosphere to achieve CMC mini-composites. The fabricated composites underwent various characterization techniques including SEM for surface morphology observation, XPS for surface composition analysis, FTIR and Raman Spectroscopy for molecular structure characterization. The Si(B)CN/SiC contained Si-N and B-N bonds, while Si-N and Hf-O-Si bonds were observed for the Si(Hf)CN/SiC with uniform and dense surfaces. An oxidation study of the CMCs showed higher stability at 1500 °C for over 150 hours. |