Nanolaminate thermal barrier coatings

摘要

An article having a thermal barrier coating includes a superalloy substrate (10) having a columnar grained ceramic coat (16) formed thereon. The ceramic coat includes a nanolaminate region comprising repeating layers of ceramic material (24) with each layer being less than 500 nm in thickness, with dispersions of metal oxide doping material (22) situated between each of the layers. The ceramic coat further includes a non-doped region (32) having a thickness greater than 500nm adjacent to the nanolaminate region, the non-doped region including one layer or a plurality of adjacent layers of ceramic material without dispersions of metal oxide doping material situated between each of the layers. In one embodiment, and by way of example only, a bond coat (12) is formed between the substrate and the columnar grained ceramic coat. According to another embodiment, the superalloy substrate forms an adherent alumina scale, and no bond coat is necessary.