SiC/yttrium silicate multi-layer coating for oxidation protection of carbon/carbon composites.

The article reports that Carbon/carbon (C/C) composites are important engineering materials for high-temperature structural applications due to their low thermal expansion coefficient, low weight, high specific strength and modulus, high creep resistance and excellent thermal shock resistance. Yttrium silicates are good oxidation resistant materials for high temperature applications because of their excellent properties such as high melting point and low oxygen infiltration. High temperature silicates such as mullite and zircon are promising candidate materials for oxidation protective coatings for C/C composites.