|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials for Energy Conversion and Storage
||Understanding Elasticity of Novel Porous Ceramics at Different Physical Conditions
||Joseph R. Gladden, Ashoka Karunarathne, Gautam Priyadarshan, Amit Pandey
|On-Site Speaker (Planned)
||Joseph R. Gladden
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. We report here a series of measurements of novel glass ceramics (porous material) with applications in high temperature fuel cells between room temperature and 800 C at 1 atm pressure. A stiffening-softening behavior was observed during the heating-cooling cycles and a reduction of acoustic damping was observed at low-pressure depending on the synthesis history of the material. A time dependent elasticity is exhibited by the sample, which we postulate as a two-step process of micro crack healing and expulsion of fluid (air) from the void spaces of the sample. We thank LG Fuel Cell Systems for support of this work.