NONDESTRUCTIVE CHARACTERIZATION OF ENVIRONMENTAL BARRIER COATINGS APPLIED TO MONOLITHIC CERAMICS

摘要

Full-size silicon nitride gas-turbine vanes coated with an environmental barrier coating (EBC) were evaluated in an exploratory way by two nondestructive methods: polarized elastic optical scattering and infrared thermal imaging. Initial test results indicate that the laser scatter data correlate with EBC thickness. A description of the methods and results of recent tests are presented.