Uncovering atomic-scale polymer-to-ceramic transformations in SiC polymer derived ceramics from polycarbosilanes

Hackbarth, Haira G.; Key, Thomas S.; Ackley, Brandon J.; Opletal, George; Rawal, Aditya; Gallington, Leighanne; Yang, Yuwei; Thomsen, Lars; Dickerson, Matthew B.; Pruyn, Timothy L.; Bedford, Nicholas M.

doi:10.1016/j.jeurceramsoc.2023.11.014

Title: Uncovering atomic-scale polymer-to-ceramic transformations in SiC polymer derived ceramics from polycarbosilanes

Journal Article · 08 November 2023 · Journal of the European Ceramic Society

DOI: https://doi.org/10.1016/j.jeurceramsoc.2023.11.014 · OSTI ID:2205134

Hackbarth, Haira G. ^[1]; Key, Thomas S. ^[2]; Ackley, Brandon J. ^[2];

^[3]; Rawal, Aditya ^[1];

^[4]; Yang, Yuwei ^[1];

^[5]; Dickerson, Matthew B. ^[2]; Pruyn, Timothy L. ^[2]; Bedford, Nicholas M. ^[1]

Univ. of New South Wales, Sydney, NSW (Australia)
Air Force Research Lab. (AFRL), Wright-Patterson AFB, OH (United States)
Commonwealth Scientific and Industrial Research Organisation (CSIRO) (Australia)
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Australian Nuclear Science and Technology Organisation (ANSTO), Melbourne, VIC (Australia)

Polycarbosilanes (PCS) are organosilicon polymers that can be converted into silicon carbide (SiC) ceramics upon pyrolysis. The phase compositions and microstructure of the final ceramic are notably impacted by the interplay of both polymer morphology and chemical functionality. Such characteristics hold tremendous potential for developing polymer derived ceramics (PDCs) with optimized properties if the complexities inherent to such materials are better understood at the atomic-scale. This study investigates the structural changes associated with the polymer-to-ceramic conversion in SiC systems derived from the pyrolysis of commercial PCS: SMP-10, SMP-877 and SMP-730, across a temperature range of 250–1600 °C. Using a combination of synchrotron X-ray spectroscopy and scattering methods, we reveal heterogeneous structures with varied compositions, influenced by both pyrolysis conditions and initial PCS functionalities. This study offers a promising approach for understanding the devitrification and compositional heterogeneity (C vs. SiC phases) in polymer-to-ceramic conversion.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR); USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2205134

Alternate ID(s):: OSTI ID: 2287633

Journal Information:: Journal of the European Ceramic Society, Vol. 44, Issue 4; ISSN 0955-2219

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Atomic-scale structure
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Spectroscopy
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Title: Uncovering atomic-scale polymer-to-ceramic transformations in SiC polymer derived ceramics from polycarbosilanes

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