Ultrasonic Characterization of Plasma Spray Coating
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
Plasma-spray coatings are widely used in industry to protect the substrate against aggressive environments or to alter the surface properties to enhance the wear resistance[1]. The coating is an aggregate of powder particles which are impacted after being heated on the substrate surface. As a result of the fast cooling rates [2], no significant diffusion occurs at the coating/substrate interface and between subsequent coating layers. Different defects in the coating layer often occur, such as delaminations between subsequent deposition layers, pores, non-melted particles, cracks due to thermal coefficient mismatch and loss of adhesion between coatings and substrates.