Lockheed Martin Corporation
Ultra high temperature environmental protection coating

Abstract:

An environmental protective coating ("EPC") for protecting a surface subjected to high temperature environments of more than 3000 degree F. The coating includes a dense platelet lamellar microstructure with a self-sealing, compliant binder material for holding the platelets together. The platelets may be formed from materials that are resistant to high temperatures and impermeable, such as ceramics. The lamellar microstructure creates a tortuous path for oxygen to reach the surface. The binder material includes engineered free internal volume, which increases the elastic strain of the EPC. The binder is softer than the platelets, which in combination with its free volume increases pliability of the EPC. The binder may have sufficient glass content and glass-forming content for initial and long-term sealing purposes.