%ARaj, Rishi [Materials Science and Engineering Program University of Colorado at Boulder Boulder Colorado]%ARaj, Rishi [Materials Science and Engineering Program University of Colorado at Boulder Boulder Colorado]%APederiva, Luca [Department of Industrial Engineering University of Trento Trento Italy]%APederiva, Luca [Department of Industrial Engineering University of Trento Trento Italy]%ANarisawa, Masaki [Graduate School of Engineering Osaka Prefecture University Sakai Japan]%ANarisawa, Masaki [Graduate School of Engineering Osaka Prefecture University Sakai Japan]%ASoraru, Gian [Department of Industrial Engineering University of Trento Trento Italy]%ASoraru, Gian [Department of Industrial Engineering University of Trento Trento Italy]%BJournal Name: Journal of the American Ceramic Society; Journal Volume: 102; Journal Issue: 3; Related Information: CHORUS Timestamp: 2023-09-14 17:51:57 %D2018%IWiley-Blackwell %JJournal Name: Journal of the American Ceramic Society; Journal Volume: 102; Journal Issue: 3; Related Information: CHORUS Timestamp: 2023-09-14 17:51:57 %K %MOSTI ID: 10077461 %PMedium: X %TOn the onset of fracture as a silicon‐based polymer converts into the ceramic phase %XAbstract

Silicon‐based polymers evolve into refractory ceramics when heated gradually up to ~1000°C. The conversion is accompanied by the loss of gaseous species, and by a two‐fold increase in density. The shrinkage can produce microcracks if the heating rate is too high, or if the specimen is too thick. This communication builds on earlier work whereby the measurement of gas evolution, and its relationship with viscous flow, are related to the onset of fracture in disk‐shaped green (polymer) samples. The onset is determined as a function of the thickness of the disks, and of the heating rate. The results are presented in the form of a processing map. The overlay with gas evolution, and strain‐rate measurements, suggest that fracture initiates with the release of hydrogen and methane, starting at temperatures near 750°C.

%0Journal Article