Protective coatings for silicon based substrates with improved adhesion

摘要

An environmental coating system for silicon based substrates (10) wherein a porous intermediate barrier layer (60) having an elastic modulus of about 30 to 150GPa is provided between a silicon metal containing bondcoat (30) and a ceramic top environmental barrier layer (40). A compliant layer (20) is provided between the substrate and the bondcoat (30).