๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Particulate-containing glass sealants for carbon-carbon composites

โœ Scribed by F.J. Buchanan; J.A. Little

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
837 KB
Volume
33
Category
Article
ISSN
0008-6223

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โœฆ Synopsis

new coating system to minimise high-temperature oxidation and degradation for C-C composites has been examined in both isothermal tests and in cyclic tests after water vapour has been introduced. The coatings used consisted of various multilayers containing CVD boron, CVD-Sic, and glasses containing both boron powder and SIC particles. For all coatings investigated, significant improvements in oxidation resistance were observed, with some coatings giving a very high degree of protection after as many as three cycles. Microscopic and analytical studies revealed that there was very little degradation of the underlying C-C sample, and that a change in the elemental ratios present in the coating revealed that the oxidation of the SIC particles in SiO, significantly enhanced the barrier to oxygen penetration to the coating.

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