Viscous Energy Dissipation at High Temperatures in Silicon Nitride.
Viscous energy dissipation in a liquid phase sintered silicon nitride was investigated at temperatures up to 1300*C. The internal friction, caused by the viscous energy dissipation, was measured with uniaxial tension-compression, torsion pendulum, and impulse excitation tests. The amount of internal friction before and after heat treatment is compared. The dependence of internal friction on temperature, frequency and stress amplitude is studied, distinguishing a low and a high (>50 MPa) stress amplitude regime. the time-dependence of the internal friction at high temperature is monitored. In addition, the evolution of the microstructure is investigated by x-ray diffraction, analysis of scanning electron microscopy images, and high resolution and analytical transmission electron microscopy in order to relate specific internal friction features to the silicon nitride microstructure.
ROEBBEN Gert;
DONZEL L.;
STEMMER S.;
STEEN Marc Pierr E Gregoire;
SCHALLER R.;
VAN DER BIEST Omer;
1998-11-09
JRC15981
https://publications.jrc.ec.europa.eu/repository/handle/JRC15981,
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