About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
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High-Temperature Corrosion and Degradation of Materials
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| Presentation Title |
Multi-Layered SiC-ZrB2 Coating Strategies to Improve Oxidation Durability of C/C Composites for High-Temperature Use |
| Author(s) |
Mosiur Rahaman, Jacob McCormick, Sanwu Wang, Matthew R.Ryder, Michael W. Keller, Hema Ramsurn, Mark Olima |
| On-Site Speaker (Planned) |
Mosiur Rahaman |
| Abstract Scope |
Carbon-carbon (C/C) composites possess excellent thermal and mechanical properties but suffer from rapid oxidation above 500 °C. To enhance oxidation resistance, this study adopts a multilayer SiC-based coating strategy. The base layer is boron-modified SiC (B-SiC), deposited by pack cementation, which forms a viscous B₂O₃ layer at lower temperatures to seal surface pores and inhibit oxygen diffusion. This is followed by a chemical vapor deposition (CVD) layer using hexamethyldisilane (HMDS) to improve coating density and fill microcracks. A final slurry coating containing ZrB₂–SiC provides a self-healing mechanism through the formation of protective ZrO₂ and SiO₂ during oxidation. Two coating sequences—PC–CVD–Slurry and PC–Slurry–CVD—are fabricated and compared. Oxidation resistance is evaluated via thermogravimetric analysis (TGA) and long-term air oxidation at 1000 °C. Microstructural and phase characterizations are conducted using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The goal is to identify the most effective multilayer architecture for long-term protection |