Ultrasonic Evaluation of Rough and Porous Ceramic Coatings with a Dual-element Large Aperture Lensless Line-focus Transoucer
نویسندگان
چکیده
Plasma-sprayed ceramic coatings are being developed for many applications such as thermal barriers and corrosion protection. In plasma spraying, the ceramic powder is heated into semi-molten droplets for projection onto a target surface by a high velocity gas stream. This coating is then rapidly cooled to form a solid layer. By repeating this process for multiple layers, a coating thickness from micrometers to millimeters may be built up. Inherent to this process, plasma-sprayed coatings generally possess rough surfaces and a high degree of porosity.
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