Patent ID: 8685545

Claim:
A thermal barrier coating comprising: an underlayer of a tungsten bronze structured ceramic material; and a layer of a thermal barrier material on the underlayer; wherein the underlayer comprises at least one of the group of: 1) an underlayer material Ba 6âˆ’3m RE 8+2m Ti 18 O 54 where 0<m<1.5, and RE represents any rare earth element or mixture thereof; and 2) an underlayer material Ba Nd 2 Ti 4 O 12 with rare earth dopants that reduce its thermal conductivity; wherein the thermal barrier material comprises 7-9 mol. % yttria-stabilized zirconia (YSZ) or a ceramic with a lower thermal conductivity than the YSZ; and wherein the underlayer is 25% to 35% porous, and the layer of thermal barrier material is 25% to 35% porous.