the preparation of nano-crystalline zirconia with tunable optical & mechanical properties
Name: Gottlieb Hangula Uahengo
Grad Year: 2020
We present a systematic study investigating rare-earth dopant type and dopant concentrations effects on the crystal phase compositions of zirconium dioxide (ZrO2) and the respective bulk mechanical and optical properties. Zirconium dioxide, a traditional structural ceramic is well known for its excellent mechanical properties, while simultaneously possessing a wide band gap (5-7eV). The combination of such excellent mechanical properties with a large band gap, opens the door for the design and fabrication of transparent structural ceramics. We use Current-Assisted Pressure Activated Densification (CAPAD), to achieve high heating rates, and comparatively short hold-times, which yields high density ceramics of fine grain sizes. This affords the opportunity to investigate, the effects of dopant type and dopant concentration in the resultant microstructure (grain size, phases and phase ratios). We will discuss how the understanding of the interplay between bulk mechanical and optical properties can lead to a structural ceramic with tunable optical and mechanical properties.
Industry Application Area(s)
Aerospace, Defense, Security | Electronics/Photonics | Materials