Improving the methodology for coating defects detection

摘要

A vacuum impregnation procedure for examining the microstructure of thermal spray coatings has been evaluated using a low-viscosity fluorescent resin. The use of confocal laser scanning microscopy for examining the microstructure allowsthree-dimensional image reconstruction of the sample. Relationships between defects (i.e., porosity or micro/macrocracking) and coating properties can be established more accurately with the proposed methodology because it enables quantitative analysis.