Ultrasonic Characterization of Thermally Sprayed Coatings

Characteristics of ZrC Barrier Coating on SiC-Coated Carbon/Carbon Composite Developed by Thermal Spray Process

“…Plasma spraying is one of the most promising coating methods because it is economical and can be easily applied on an industrial scale [17,18,19]. It is also a suitable technique for depositing carbides with high melting points such as ZrC, HfC, etc.…”

Porosity Characterization of Thermal Barrier Coatings by Ultrasound with Genetic Algorithm Backpropagation Neural Network

“…Numerous nondestructive methods have been proposed for quantitative determination of porosity in TBCs, such as thermography method [6][7][8][9][10], terahertz technique [11], X-ray [12], and effective medium theory [13]. Among all existing methods, the ultrasonic technique is a relatively inexpensive, fast, and reliable nondestructive method, which has been widely used to detect porosity in thermally sprayed coatings [3,[14][15][16][17]. A representative method is to use ultrasonic parameters in thermally sprayed coatings, usually longitudinal wave velocity and ultrasonic attenuation, to evaluate its properties, including porosity [15,[17][18][19][20].…”

“…Among all existing methods, the ultrasonic technique is a relatively inexpensive, fast, and reliable nondestructive method, which has been widely used to detect porosity in thermally sprayed coatings [3,[14][15][16][17]. A representative method is to use ultrasonic parameters in thermally sprayed coatings, usually longitudinal wave velocity and ultrasonic attenuation, to evaluate its properties, including porosity [15,[17][18][19][20]. For example, a trend line or corresponding expression between the velocity/attenuation and porosity for the coatings investigated is used to estimate the porosity content of other parts with the same coatings by measuring their thickness and velocity [17,19].…”