In Situ Observation of Oxide Films Formed during Thermal Oxidation of SiC-B_4C Composite Using Raman Spectroscopy

摘要

Oxidation behaviour of SiC-B_4C composites at 1073 K was investigated by laser Raman spectroscopy. In situ Raman spectra of the surface of the composite indicated the formation of carbon and borosilicate as oxidation products. The carbon was enriched in the part of borosilicate closer to the oxide/composite interface using a micro-Raman spectroscopic system. The oxidation resistance of the composites was improved with increasing SiC content.