Abstract
Yttrium silicate environmental barrier coatings (EBCs) on C/SiC composites were fabricated by using polysiloxanes-derived ceramic process. In order to reduce the free silica in the resultant ceramic coatings, Y 2O 3 was added as an active filler. The materials with different weight ratios of polysiloxanes to Y 2O 3 were synthesized. Their coefficient of thermal expansion (CTE) and water-vapor resistance were tested. The results indicated that the composition of 50% Y 2O 3-50% polysiloxanes (Y50) was suitable to be the EBCs for C/SiC composites. The C/SiC composites coated with Y50 were tested in the water-vapor environments at 1400°C for 200h. The results revealed that such a coating could effectively protect the C/SiC composites.
| Original language | English |
|---|---|
| Pages (from-to) | 433-439 |
| Number of pages | 7 |
| Journal | Journal of the European Ceramic Society |
| Volume | 33 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 2013 |
Keywords
- Active filler
- Environmental barrier coatings
- Polymer-derived ceramics
- Yttrium silicate
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