MULTI-LAYERED COATING WITH COLUMNAR MICROSTRUCTURE AND BRANCHED COLUMNAR MICROSTRUCTURE

摘要

An article (60) includes a substrate (62) and a multi-layered ceramic barrier coating (64) on a substrate (62). The coating (64) includes, from the substrate (62) outward, a first layer (66) of a low-dopant ceramic material and a second layer (68) high-dopant ceramic material. The first layer (66) has a columnar microstructure (70) and the second layer (68) has a branched columnar microstructure (72).