Thermal barrier coatings with low thermal conductivity comprising lanthanide sesquioxides

摘要

A thermal barrier coating comprising more than 20 mol% In 2 O 3 , and a lanthanide sesquioxide having a formula A 2 O 3 where A is selected from the group consisting of Er, Nd, Eu, Dy, Gd, Pr, and mixtures thereof, and the balance zirconia. In this coating system, the zirconia is preferably present in an amount greater than 40 mol%, the lanthanide sesquioxide is preferably present in an amount 0.001 to 40 mol%, and the coating contains less than 10 vol% of phases with a pyrochlore structure. The present invention also broadly relates to an article having a metal substrate and a thermal barrier coating as discussed above.