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Ultrasonic Methods for Nondestructive Evaluation of Ceramic Coating

Report Number: WADD TR 61-91 Part 2
Author(s): K. E. Feith and W. Lawrie
Corporate Author: Armour Research Foundation
Date of Publication: 1963-02
Pages: 44
Contract: AF 33(616)6396
Project: 7360
AD Number: AD0401658
Original AD Number: AD-401 658

This report describes investigations into the use of ultrasonic techniques to determine the strength and integrity of ceramic-metal bonds. An acoustic image converter system was used successfully to obtain a television type display of 1/32 in. diam. laminar defects in a zirconium oxide-inconel bond. The measured defect thickness varied between 300 and 500 microinches or about a factor of three greater than the average large grain in the coating material. Schlieres optical and acoustic lens techniques were used to visually investigate detailed properties of ultrasonic fields and the interaction of ultrasonic energy with a solid. The theory of Rayleigh waves was reviewed to provide a framework for experimental integrity determination of ceramic coatings.

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