Thermal barrier coating systems and materials

摘要

A new family of ceramic materials is identified having particular utility as thermal insulating or thermal barrier coatings on metallic substrates. The ceramic materials have a pyrochlore structure and are typified by the composition A2B2O7 where A and B are various ions and O is oxygen. A may have a positive charge of 3+ or 2+ and B may have a positive charge of 4+ or 530. These materials are characterized by having chemical stability, thermal stability and thermal insulating properties superior to those of currently used thermal barrier ceramics. An example pyrochlore material is lanthanum zirconate.