| 摘要 |
An article (10) comprising a substrate (12) formed of a silicon-comprising material, such as an article (10) exposed to the hostile thermal environment of a gas turbine engine. The article (10) further comprises an environmental barrier layer (16), e.g., an alkaline earth metal aluminosilicate, and a top coat comprising zirconia or hafnia stabilized with up to about 10 mole % of an oxide of a metal selected from the group consisting of magnesium, calcium, scandium, yttrium, and lanthanide metals, and mixtures thereof. The article (10) further comprises a transition layer (20) between the environmental barrier layer (16) and the top coat (18), the transition layer (20) comprising zirconia or hafnia stabilized with up to about 10 mole % of an oxide of a metal selected from the group consisting of magnesium, calcium, scandium, yttrium, and lanthanide metals; and a low CTE oxide selected from the group consisting of niobia and tantala; and mixtures thereof. A method for preparing a thermal/environmental barrier coating system (14) on a substrate (12) formed of a silicon-comprising material is also disclosed. |
