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ULTRASONIC METHODS FOR NONDESTRUCTIVE EVALUATION OF CERAMIC COATINGS
IIT RESEARCH INST CHICAGO ILL
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INVESTIGATIONS INTO THE USE OF ULTRASONICS TO DETECT DEFECTS IN CERAMIC-METAL BONDS AND TO MEASURE THE STRENGTHS OF THE BONDS ARE DESCRIBED. In the techniques, ultrasonic frequencies from 30 cps to 35 mcsec were used and in one method 2 frequencies are used simultaneously. Low frequency energy 14 kcsec was successfully used to detect defects by decrement measurements. Low frequencies were used in further studies of the intermodulation method to locate regions of bonds in which defects are present. High frequiencies, up to 35 mcsec, were used with a transmission method and visual images of defects are displayed using a simple charge scanning technique. High frequency energy was also used in the form of surface waves. Author
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