Ultrasonic Buffer-Rod Technique for the High-Temperature Measurement of the Elastic Moduli of Short Specimens

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Abstract
This paper describes a method of measuring the elastic moduli of short specimens to very high temperatures by the use of ultrasonics. A buffer-rod technique is used, but the sound is transmitted from the buffer rod to the short specimen across an interface without the use of a couplant. The specimen has a machined index region that extends into the uniform hot zone of a vacuum furnace. The required information is taken from the index region. The experimental technique used to achieve a mechanical bond between the buffer and the specimen that is sufficient to transmit a considerable quantity of ultrasound is detailed. This method has been successfully used to 1150°C, and has potential application up to 2500°C.