High temperature refractory coatings for ceramic substrates
A composite article includes a substrate and a protective layer on the substrate. The protective layer includes a non-oxide ceramic matrix and a refractory phase within the non-oxide ceramic matrix.
1. A composite article comprising:
a substrate; and
a protective layer on the substrate, the protective layer including a non-oxide ceramic matrix and at least one refractory phase within the non-oxide ceramic matrix, the refractory phase comprising hafnium carbide and hafnium silicate.
2. The composite article as recited in claim 1 , wherein the non-oxide ceramic matrix comprises at least one of carbon, silicon carbide, silicon carbonitride, hafnium carbide, hafnium carbonitride, or boron silicon carbonitride.
3. The composite article as recited in claim 1 , wherein the substrate comprises a ceramic matrix composite.
4. The composite article as recited in claim 3 , wherein the ceramic matrix composite comprises a carbon matrix and silicon carbide reinforcement within the carbon matrix.
5. The composite article as recited in claim 1 , wherein the protective layer comprises about 50-90 vol % of the non-oxide ceramic matrix and about 10-50 vol % of the refractory phase.
6. The composite article as recited in claim 1 , further comprising a silicate layer between the substrate and the protective layer.
7. The composite article as recited in claim 6 , wherein the silicate layer comprises borosilicate glass.
8. The composite article as recited in claim 1 , wherein the non-oxide ceramic matrix comprises at least one of hafnium carbide, hafnium carbonitride or boron silicon carbonitride.
9. A composite article comprising:
a substrate; and
a protective layer on the substrate, the protective layer including a non-oxide ceramic matrix and at least one refractory phase within the non-oxide ceramic matrix, the refractory phase comprising hafnium carbide and hafnium silicate.