About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Molecular Approaches to Ceramics; Synthesis, Processing, Modeling, and Derived Ceramics
|
| Presentation Title |
Characterization of Processing-Induced Stress and Crack Formation in Polymer-Derived Ceramics During Pyrolysis |
| Author(s) |
Heidi C. Menges, Heng Zuo |
| On-Site Speaker (Planned) |
Heidi C. Menges |
| Abstract Scope |
Polymer-derived ceramics offer a promising route for fabricating ceramic components through the shaping and pyrolysis of preceramic polymers. However, limited understanding of how stresses introduced during polymer-state shaping and curing contribute to warpage and cracking remains a barrier to broader use of this approach. In this work, we investigate the role mechanical loading within a preceramic polymer plays on crack formation during pyrolysis. Tensile and compression experiments are used to characterize the stress–strain response of SPR-688, a silicon oxycarbide-forming preceramic polymer, at different cure states. This data is incorporated into a material model describing deformation under processing-relevant loading conditions. Partially cured polymer specimens are subjected to controlled deformation histories prior to thermal curing and pyrolysis, with microscopy performed before and after pyrolysis to identify crack formation and propagation. The resulting ceramic specimens are mechanically tested to evaluate how precursor preloading history affects their elastic moduli and ultimate tensile strengths. |