High-temperature behavior of silicon oxycarbide glasses in air environment

Silicon oxycarbide glasses (SiOC) have been produced by siloxane resin under flowing argon at 1000 degrees C and then their evolutions in air from 800 to 1700 degrees C were investigated. Those glasses annealed at various temperatures were characterized by X-ray diffraction, (29)Si MAS NMR, Raman spectroscopy, and chemical element analysis. It can be found that oxidation reactions of the SiOC glasses occurred at above 1000 degrees C; carbothermal reduction was indiscernible at temperature below 1600 degrees C but almost finished at 1700 degrees C; and the decomposition of SiO(x)C(4-x) network was complete at 1400 degrees C. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.