Non-Destructive Evaluation of Thermal Spray Coating Interface Quality By Eddy Current Method

Mi, B. ; Zhao, G. ; Bayles, R.

United States. Department of Energy. Yucca Mountain Project Office.

关键词: Eddy Currents;    Steels;    Spray Coating;    36 Materials Science;    Evaluation;   

DOI  :  10.2172/894176
RP-ID  :  NA
RP-ID  :  NA
RP-ID  :  894176

美国|英语

来源: UNT Digital Library

【 摘 要 】

Thermal spray coating is usually applied through directing molten or softened particles at very high velocities onto a substrate. An eddy current non-destructive inspection technique is presented here for thermal spray coating interface quality characterization. Several high-velocity-oxy-fuel (HVOF) coated steel plates were produced with various surface preparation conditions or spray process parameters. A quad-frequency eddy current probe was used to manually scan over the coating surface to evaluate the bonding quality. Experimental results show that different surface preparation conditions and varied process parameters can be successfully differentiated by the impedance value observed from the eddy current probe. The measurement is fairly robust and consistent. This non-contact, nondestructive, easy-to-use technique has the potential for evaluating the coating quality immediately after its application so that any defects can be corrected immediately.