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Abstract

The viscous energy dissipation in pressureless sintered silicon nitride is investigated by internal friction measurements. Uniaxial tension-compression and torsion pendulum tests are performed. The change of internal friction during high temperature tests, and the stress amplitude dependence of internal friction are studied. The changes of the microstructure during high temperature tests are characterized by x-ray diffraction and high resolution electron microscopy. Crystallization of intergranular amorphous pockets and decrease of the thickness of intergranular amorphous films are shown to reduce internal friction.

Additional information

Authors: ROEBBEN G, Katholieke Universiteit Leuven, Department of Metallurgy and Materials Engineering, Heverlee (BE);STEMMER S, Katholieke Universiteit Leuven, Department of Metallurgy and Materials Engineering, Heverlee (BE);VAN DER BIEST O, Katholieke Universiteit Leuven, Department of Metallurgy and Materials Engineering, Heverlee (BE);DONZEL L, École Polytechnique Fédérale de Lausanne, Institut de Génie Atomique (CH);SCHALLER R, École Polytechnique Fédérale de Lausanne, Institut de Génie Atomique (CH);STEEN M, JRC Petten (NL)
Bibliographic Reference: Paper presented: 6th International Conference on Ceramics in Heat Engines, Arita (JP), 20-24 October 1997
Availability: Available from (1) as Paper EN 41098 ORA
Record Number: 199810209 / Last updated on: 1998-02-12
Category: PUBLICATION
Original language: en
Available languages: en