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Synthesis of Si–C–O Bulk Ceramics with Various Chemical Compositions from Polycarbosilane
Author(s) -
Kakimoto Kenichi,
Wakai Fumihiro,
Bill Joachim,
Aldinger Fritz
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb02088.x
Subject(s) - pyrolysis , ceramic , sintering , microstructure , materials science , oxygen , chemical engineering , chemical composition , transition temperature , mineralogy , metallurgy , chemistry , organic chemistry , superconductivity , engineering , physics , quantum mechanics
Si‐C‐O bulk ceramics with various atomic ratios were produced by pyrolysis and high‐temperature treatment (HTT) of a polycarbosilane (PCS) precursor with a given amount of oxygen. The oxygen introduction within the PCS molecular structure makes the compact infusible during the pyrolysis step, and supports sintering. The derived chemical compositions are mapped on a Si‐C‐O constitution diagram, with their transition behaviors due to HTT described. Upon heating between 1500° and 1700°C, the chemical compositions of the as‐pyrolyzed specimens were as follows: PCS‐6 (SiC 1.36 O 0.26 ), PCS‐8 (SiC 1.25 O 0.45 ), and PCS‐10 (SiC 1.02 O 0.68 ), moving toward C/Si = 1.2, 1.0, and 0.8 with a reduction of the oxygen content, respectively. It is also shown that there are influences of the initial oxygen content on the resulting microstructure of both as‐pyrolyzed and heat‐treated specimens.