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Thermo‐Oxidative Stability of Polymer‐Derived Si‐B‐C Ceramics
Author(s) -
Jiang Yun,
Lu Jiarong,
Huang Farong,
Du Lei
Publication year - 2015
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12399
Subject(s) - materials science , ceramic , x ray photoelectron spectroscopy , borosilicate glass , microstructure , chemical engineering , pyrolysis , scanning electron microscope , chemical stability , isothermal process , composite material , engineering , physics , thermodynamics
Si‐B‐C ceramics with different elemental compositions and microstructures were prepared by the pyrolysis of an o ‐carborane‐containing poly(silylene‐arylacetylene) ( CB ‐ PSA ) thermoset at 1000°C, 1200°C, 1300°C, and 1450°C. The thermo‐oxidative stability of the ceramics was investigated by tracing the weight loss of ceramics during the isothermal oxidation at 800°C, 1000°C, and 1200°C under dry oxygen. The chemical bonding states of the ceramics before oxidation and the elemental compositions of the ceramics after oxidation were analyzed by X‐ray photoelectron spectroscopy ( XPS ). The surface morphologies of the ceramics after oxidation were recorded using scanning electron microscopy ( SEM ). The results show that the Si‐B‐C ceramic prepared at 1450°C produces an integral borosilicate film on the surface of the ceramics when oxidized at both 1000°C and 1200°C and exhibits better oxidation resistance than the other Si‐B‐C ceramics prepared at 1000°C, 1200°C, and 1300°C. Oxidation temperatures, elemental compositions, and crystallites of the Si‐B‐C ceramics are found to influence the formation of the borosilicate films which plays an important role in the thermo‐oxidative stability of the ceramics.