Crystallization behavior of polymer-derived Si-O-C for ceramic matrix composite processing

David L. Poerschke, Angus Braithwaite, Daesung Park, Fredrick Lauten

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

To facilitate the development of matrix processing protocols for SiC-based ceramic matrix composites (CMC) using the polymer infiltration and pyrolysis (PIP), the crystallization behavior of a commercial Si-(O)-C polymer derived ceramic (PDC) was studied using fiberless matrix monoliths replicating the microstructure features common in PIP CMC matrices. The study examined how the processing time and temperature impact the apparent bulk (average) crystallinity as well as how microstructure features lead to variations in the local crystallization rates. The first stage of crystallization involves rapid β-SiC precipitation throughout the bulk of the material. This stage appears to be insensitive to the local microstructure. Subsequent crystallization stages involve partial decomposition of PDC, producing CO and/or SiO. Because these processes involve gaseous exchange with the atmosphere, they are more directly influenced by the local microstructure. Therefore, although the bulk crystallinity quickly reaches an intermediate plateau corresponding to partial phase separation, the near-surface regions are fully crystallized more quickly than the interior regions. The implications of these effects are discussed in the context of the processing and performance of SiC-CMCs.

Original languageEnglish (US)
Pages (from-to)329-341
Number of pages13
JournalActa Materialia
Volume147
DOIs
StatePublished - Apr 1 2018

Bibliographical note

Funding Information:
Research supported by NASA -funded STTR collaboration with Physical Sciences Incorporated, grant number N00014-14-P-1129 monitored by Dr. Valerie Wiesner. Use of the Shared Experimental Facilities of the Materials Research Science and Engineering Center at UCSB (MRSEC NSF DMR 1720256) is gratefully acknowledged. The UCSB MRSEC is a member of the NSF-supported Materials Research Facilities Network ( www.mrfn.org ). The authors are grateful Carlos Levi (UCSB) for helpful discussions and to Rebecca Reitz (UCSB) for assistance with specimen preparation and heat treatment.

Publisher Copyright:
© 2018 Acta Materialia Inc.

Keywords

  • Ceramic matrix composite
  • Crystallization
  • Polymer derived ceramic
  • Silicon carbide

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