|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Thermal Property Characterization, Modeling, and Theory in Extreme Environments
||Thermal and mechanical properties of hafnon (HfSiO4), theory and experiments
||Zhidong Ding, Mackenzie Ridley, Jeroen Deijkers, Naiming Liu, Md. Shafkat Bin Hoque, John Gaskins, Mona Zebarjadi, Patrick E Hopkins, Haydn Wadley, Elizabeth Opila, Keivan Esfarjani
|On-Site Speaker (Planned)
Hafnium orthosilicate (HfSiO4: hafnon) has been proposed as an environmental barrier coating (EBC) material to protect silicon and silicon-based ceramic materials at high temperatures and as a candidate dielectric material in microelectronic devices. It can naturally form at the interface between SiO2 and hafnia (HfO2). In this work, the thermophysical properties of hafnon such as thermal expansion, elastic moduli and thermal conductivity, have been investigated using a combination of density functional theory (DFT) calculations and experimental assessments.
The predicted thermal conductivity from Boltzmann transport theory is approximately 16.1 W/m.K at 300K, while that that of our samples using both hot disk and laser flash measurements gave a value of 13.3 W/m.K. Mechanical properties were measured using nanoindentation techniques. Overall calculated properties agree relatively well with the experimental characterizations, paving the way for the future investigation of the thermomechanical properties of other oxides or silicates.