Patent ID: 7357994
Filing Date: 2008-04-15
Classification: C04B,C09D,C23C

Abstract:
1. A coating system on an article having a substrate formed of a silicon-containing material, the coating system comprising: a silicate-containing coating overlying the substrate and containing at least one silicate susceptible to corrosion; a thermal barrier coating overlying the silicate-containing coating and formed of a thermal-insulating material having a coefficient of thermal expansion (CTE) different than the silicate-containing coating; and a transition layer between the silicate-containing coating and the thermal barrier coating, the transition layer providing corrosion protection to the at least one silicate of the silicate-containing coating and providing a CTE mismatch-abating transition between the silicate-containing coating and the thermal barrier coating, the transition layer being free of silicates and consisting essentially of at least one aluminate compound and optionally containing the thermal-insulating material and/or alumina, the at least one aluminate compound being chosen from the group consisting of YAlO wherein to enable the transition layer to provide a CTE mismatch-abating transition between the silicate-containing coating and the thermal barrier coating, the transition layer: