Thermal/environmental barrier coating system for silicon-based materials
AssigneeGeneral Electric Company
InventorsIrene T. Spitsberg, Hongyu Wang
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Abstract
A coating system for a substrate containing a silicon-based material, such as silicon carbide-containing ceramic matrix materials containing silicon carbide and used to form articles exposed to high temperatures, including the hostile thermal environment of a gas turbine engine. The coating system includes a layer of barium strontium aluminosilicate (BSAS) as a bond coat for a thermal-insulating top coat. As a bond coat, the BSAS layer serves to adhere the top coat to a SiC-containing substrate. The BSAS bond coat exhibits sufficient environmental resistance such that, if the top coat should spall, the BSAS bond coat continues to provide a level of environmental protection to the underlying SiC-containing substrate.
Claims20
An article comprising:
- a substrate comprising silicon;
- a bond coat on the substrate, the bond coat comprising barium strontium aluminosilicate;
- and
- a top coat on the bond coat.
An article comprising:
- a substrate containing silicon carbide;
- a bond coat on the substrate, the bond coat consisting of barium strontium aluminosilicate;
- and
- a thermal-insulating layer overlying the bond coat.
A gas turbine engine component having a coating system on a surface thereof, the component comprising:
- a substrate comprising a silicon;
- a bond coat on the substrate, the bond coat consisting of barium strontium aluminosilicate;
- and
- a yttria stabilized zirconia layer overlying the bond coat.
Dependencies are inferred from the claim text.