Community Research and Development Information Service - CORDIS

Improvement and testing of BoraSiC®coatings

BoraSiC® coatings are a sandwich CVD coating system composed of SiC/B4C/SiC. The coating procedure was the first time applied on structural components like tubes with flange and end caps. Such a CVD coating has shown a good self healing potential under isothermal oxidation conditions combined with crack closing effects.

Furthermore, the oxidation resistance at temperatures below 1000 °C was superior to all other systems applied on carbon/carbon based CMCs.

The thermocyclic oxidation behaviour was tested under complex corrosion conditions. The system has shown a good potential. However, in presence of moisture the life time is limited by an evaporation of the formed boron oxide in the cracks.

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