MULTI-LAYERED COATING WITH COLUMNAR MICROSTRUCTURE AND BRANCHED COLUMNAR MICROSTRUCTURE

摘要

A method includes forming a multi-layered ceramic barrier coating under a chamber pressure of greater than 1 Pascals. In the method, low- and high-dopant ceramic materials are evaporated using input evaporating energies that fall, respectively, above and below a threshold for depositing the materials in a columnar microstructure (low-dopant) and in a branched columnar microstructure (high-dopant).

主权项

1. A method of forming a multi-layered ceramic barrier coating, the method comprising:
under a chamber pressure of greater than 1 Pascals, evaporating a low-dopant ceramic material using a first input evaporating energy that is above a threshold for depositing the low-dopant ceramic material in a low-dopant ceramic columnar microstructure versus a low-dopant ceramic branched columnar microstructure, the evaporated low-dopant ceramic material depositing on a substrate as a first layer that has the low-dopant ceramic columnar microstructure; and under the chamber pressure of greater than 1 Pascal, evaporating a high-dopant ceramic material using a second input evaporating energy that is below a threshold for depositing the high-dopant ceramic material in a high-dopant ceramic columnar microstructure versus a high-dopant ceramic branched columnar microstructure, the evaporated high-dopant ceramic material depositing on the substrate as a second layer that has the high-dopant ceramic branched columnar microstructure.