NDTnet 1998 Aug, Vol.3 No.8

Abstract

This paper deals with the characterization of materials at high temperatures by a non destructive method. The elastic moduli of metallic and organic samples are linked to the shifts of the velocity of the bulk waves versus the temperature. For temperature up to 1000°C we use a resistance device heating with a slow kinetics. The results have been compared successfully to those obtained by mechanical testings. The process is well controlled with automatic acquisitions associated to signal processing. This set-up is then shifted up to 3000°C using a RF heating and insulating graphite delay-lines. This more compact device, devoted to the characterization of refractory materials, is under development. The bulk velocities of a metallic alloy have been measured which has allowed the elastic constants evaluation at 2245°C.
We also need to study the material behavior around its melting temperature. A non contact measurement is therefore needed. It is made of a Laser excitation and an interferometric detection. Our first application was dedicated to the study of a Lead alloy up to 210°C.The accuracy on elastic constants is in the range of the percent.
Our next subjects of interest deal with the development of signal processing adapted to the study of inhomogeneous materials and with the set-up of new characterization means to study the material state change over its melting point.

Abstract Source:
Book of Abstracts, 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN: 87-986898-0-00

Full-Text Source:
Proceedings of the 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN:

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