Abstract
The adhesion strength of thermal sprayed coatings is relatively low, and they sometimes tend to delaminate from the substrate during operation. In particular, sprayed ceramic coatings for thermal barriers, such as ZrO2, often delaminate because of thermal shock; therefore, ceramic coatings are often submitted to thermal shock tests. A nondestructive inspection method using ultrasound to detect the delamination of sprayed coating was proposed. In this study, a coating model was made with acrylic plates, and an ultrasonic test was applied to investigate the precision of detecting delamination by the ultrasonic testing method. Results indicate that delamination more than 1mm in diameter can be detected by the ultrasonic testing method. Moreover, the delaminating process of sprayed coatings under thermal shock tests can be detected by this method.
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“Testing Method for Thermal Sprayed Ceramic Coating,” JIS H8666-1990,4.2,4.5, Japanese Standard Association, 1990
Y. Suga, J. Takahashi, and Harjanto, On the Detection of Separation and Adhesion of Sprayed Coatings by Ultrasonic Method,J. Jpn. Therm. Spraying Soc, Vol 28 (No. 4), 1991, p 196 (in Japanese)
Y. Suga and J. Takahashi, On Ultrasonic Testing for Evaluating the Adhesion of NiCr Alloy Sprayed Coating to Substrate,Q. J. Jpn. Weld. Soc, Vol 10, (No. 1), 1992, p 132 (in Japanese)
Y Suga, J. Takahashi, and Harjanto, Study on the Ultrasonic Test for Evaluating the Adhesion of Sprayed Coating to a Substrate,Thermal Spray: International Advances in Coatings Technology, C.C. Berndt, Ed., ASM International, 1992, p 247
Y. Suga and Harjanto, On an Estimation of Adhesion Strength of NiCr Alloy Sprayed Coating to a Substrate by Ultrasonic Bottom Echo Testing Method,J. Jpn. Therm. Spraying Soc, Vol 30, (No. 1), 1993, p 1–12 (in Japanese)
Y Suga, Harjanto, and K. Makabe, Study of a Non-Destructive Method to Evaluate Adhesion of Thermal Sprayed Coatings,Thermal Spraying Conference, DVS 152, German Welding Society, 1993, p 201
Y. Suga, G. Shou, S. Kurihara, and S. Fukami, Detecting Precision of Sprayed Ceramic Coating and Observation of Delaminating Process in Thermal Shock Test by Ultrasonic Testing Method,J. Jpn. Therm. Spraying Soc, Vol 31, (No. 2), 1994, p 79 (in Japanese)
C.K. Lin and C.C. Berndt, Measurement and Analysis of Adhesion Strength for Thermally Sprayed Coatings,J. Therm. Spray Technol., Vol 3 (No. 1), 1994, p 75–104
J. Krautkraemer and H. Krautkraemer,Ultrasonic Testing of Materials (translated in Japanese), Nihon Nouritsu Kyoukai, 1980
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Lian, D., Suga, Y., Shou, G. et al. An ultrasonic testing method for detecting delamination of sprayed ceramic coating. JTST 5, 128–133 (1996). https://doi.org/10.1007/BF02646425
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DOI: https://doi.org/10.1007/BF02646425