Low conductivity and high toughness tetragonal phase structured ceramic thermal barrier coatings

摘要

A composition for thermal barrier coatings exhibiting improved thermal conductivity and toughness is provided. The composition is comprised of a base majority oxide, a first dopant oxide, at least one small rare earth oxide, at least one large rare earth oxide and at least one toughening oxide. Compared to traditional thermal barrier coatings, a composition of the present invention provides approximately twice the toughness one-third to one-half the thermal conductivity.