Abstract
Elastic constant measurements, along with temperature and pressure derivatives, are of interest to both the physics and engineering communities. One of the most precise and efficient methods for such measurements is resonant ultrasound spectroscopy (RUS) in which the vibrational resonance spectrum of a sample is used to determine the full elastic tensor of the material. In this talk, we will present the temperature dependent elastic constants of a series of ceramics, including glass ceramics and DMMA, between room temperature and 800°C. These ceramics have been designed for use in high temperature fuel cell by LG Fuel Cell Systems. We will discuss the effects of thermal cycling. Some of the ceramics are porous in nature which increases acoustic damping. Damping mechanisms in porous materials and experimental techniques to reduce damping will also be discussed.
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