This paper shows how mechanical spectroscopy (i.e. the measurement of stiffness and damping properties as a Junction of e.g. temperature) can be used to quantitatively assess the intergranular glass phases in liquid-phase-sintered silicon nitrides and carbides. A recently proposed relation is presented which links the change of stiffness as a function of temperature with the volume fraction of intergranular amorphous phase. Current issues in the field of high-temperature mechanical spectroscopy of silicon-based ceramics such as high-strain-amplitude uniaxial tests, and the relation between damping and fatigue and fracture toughness, are discussed.
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