Thermal/environmental barrier coating system for silicon-based m

Details Thermal/environmental barrier coating system for silicon-based m Thermal/environmental barrier coating system for silicon-based m

1998-03-16

1999-11-16

Speer, Timothy

Stock material or miscellaneous articles

Composite

Of inorganic material

428698, 428701, 428702, 428469, 428472, B32B 1706

Patent

active

059854707

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.

REFERENCES:
patent: 5214004 (1993-05-01), Bansal
patent: 5391404 (1995-02-01), Lee et al.
patent: 5683825 (1997-11-01), Bruce et al.
patent: 5759932 (1998-06-01), Sangeeta et al.

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