| 摘要 |
An environmental barrier coating composition for a ceramic matrix composite is provided that includes a doped rare earth disilicate layer over the ceramic matrix composite. The doped rare earth disilicate includes a disilicate having a composition of RE2Si2O7. The 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. |
| 主权项 |
1. An environmental barrier coating for a ceramic matrix composite, the environmental barrier coating comprising:
a calcium-magnesium aluminosilicate-resistant layer; a doped rare earth disilicate layer; wherein the calcium-magnesium aluminosilicate-resistant layer is located over the doped rare earth disilicate layer; wherein the doped rare earth disilicate layer is located between the calcium-magnesium aluminosilicate-resistant layer and the ceramic matrix composite; wherein the doped rare earth disilicate layer includes a rare earth disilicate that has a composition of RE2Si2O7, wherein RE comprises at least one of lutetium, ytterbium, thulium, erbium, holmium, dysprosium, terbium, gadolinium, europium, samarium, promethium, neodymium, praseodymium, cerium, lanthanum, yttrium, or scandium; wherein the doped rare earth disilicate layer includes a dopant that includes at least one of Al2O3, an alkali earth oxide, or an alkali oxide; wherein the dopant is present in an amount between about 0.1 weight percent (wt. %) and about 5 wt. %, the balance of the doped rare earth disilicate layer being the rare earth disilicate; wherein the calcium-magnesium aluminosilicate-resistant layer comprises a rare earth oxide, wherein the rare earth oxide has a composition of RE2O3, wherein RE comprises at least one of lutetium, ytterbium, thulium, erbium, holmium, dysprosium, terbium, gadolinium, europium, samarium, promethium, neodymium, praseodymium, cerium, lanthanum, yttrium, or scandium; wherein the calcium-magnesium aluminosilicate-resistant layer further includes Al2O3 and SiO2; wherein the Al2O3 in the calcium-magnesium aluminosilicate-resistant layer is present in an amount between about 0.1 wt. % and about 5 wt. %; and wherein the SiO2 in the calcium-magnesium aluminosilicate-resistant layer is present in an amount between about 5 wt. % and about 25 wt. %, with the balance of the CMAS-resistant layer being the rare earth oxide. |
