| 主权项 |
1. A thermal barrier coating composition for a ceramic matrix composite comprising:
a porous barium-strontium-aluminosilicate layer; a doped rare earth disilicate layer; wherein the porous barium-strontium-aluminosilicate layer is located over the doped rare earth disilicate layer; wherein the doped rare earth disilicate layer is located between the porous barium-strontium-aluminosilicate layer and the ceramic matrix composite; wherein the porous barium-strontium-aluminosilicate layer includes a fugitive material; wherein the fugitive material is selected from the group consisting of at least one of graphite, hexagonal boron nitride, and a polymer; wherein the doped rare earth disilicate layer includes a disilicate that has a composition of RE2Si2O7, wherein RE is selected from the group consisting of at least one of lutetium, ytterbium, thulium, erbium, holmium, dysprosium, terbium, gadolinium, europium, samarium, promethium, neodymium, praseodymium, cerium, lanthanum, yttrium, and scandium; wherein the doped rare earth disilicate layer includes a dopant that is Al2O3 and alkali oxide; and wherein the dopant is present in an amount between about 0.1 wt % and about 5 wt %, and the balance of the doped rare earth disilicate layer being the disilicate. |
