Abstract
SiC coatings were chemically vapour deposited (CVD) on a carbon-carbon (C/C) composite. These coatings contain thermal mismatch cracks which require sealing between 600 and 1100 °C. The volatility, wettability and moisture sensitivity of binary and multicomponent borosilicate glasses were investigated, and these glasses were found to provide sealing over some or all of this temperature range. The volatilization rate is enhanced by the presence of water vapour and results in the loss of the B2O3 constituent from the glass. The C/C composite surface showed poorer wetting than the CVD SiC surface, and both surfaces showed improved wetting for glasses of higher B2O3 content. The moisture sensitivity of the binary borosilicate glasses was proportional to the B2O3 content. Room-temperature moisture had little effect on the multicomponent glasses.
Published Version
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