Investigations of Oxidation Protection Systems for Carbon-Carbon Composites Formed by Chemical Vapor Deposition and Plasma-Assisted Chemical Vapor Deposition Techniques.

摘要

Conditions necessary for the preparation of pack cemented oxidation resistant reacted layers on carbon-carbon composites were developed. Reacted layers were produced containing SrC, ZrC, B4C. The oxidation resistance of such layers were listed in air at temperatures up to 1800 C and the results were compared. Additional surface layers deposited into the reacted layers consisted of SiC, ZrB2, SiC/Zrb2 and graded SiC/ZrC. These layers significantly improved the oxidation resistance of the layers generated by pack cementation the oxidation resistance of the combined layer systems (pack cementation plus CVD) was determined by subjecting each system to an air environmental in an isothermal and a cyclicly varying temperature environmental temperatures up to 1700 C.