About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Molecular Approaches to Ceramics; Synthesis, Processing, Modeling, and Derived Ceramics
|
| Presentation Title |
Kinetics of Pyrolysis Measured During In-Situ Creep Experiments |
| Author(s) |
Rishi Raj |
| On-Site Speaker (Planned) |
Rishi Raj |
| Abstract Scope |
The standard process for the conversion of silicon-based polymers into an amorphous ceramic consists of two steps: cross-linking and pyrolysis. Experiments where the creep of green polymer fibers was measured in a constant heating rate are presented: these data show an inverted V shaped curve where the fibers initially lengthen but then start to shrink as they convert into the ceramic. The inversion is related to the evolution of hydrogen and the concomitant development of the “free carbon” network. The remarkable creep resistance of the amorphous ceramic is ascribed to the evolution of the carbon network. |