139. preparation of rare earth stabilized nanocrystalline zirconia with tunable optical/mechanical properties

Department: Mechanical & Aerospace Engineering
Faculty Advisor(s): Javier E. Garay

Primary Student
Name: Gottlieb Hangula Uahengo
Email: guahengo@ucsd.edu
Phone: 651-783-2059
Grad Year: 2020

We present a systematic study investigating rare-earth dopant type and dopant concentrations effects on crystal phase compositions of zirconium dioxide (ZrO 2 ) and the respective bulk mechanical and optical properties. Zirconium dioxide, a traditional structural ceramic possesses excellent mechanical properties, while simultaneously possessing a wide band gap (5-7eV). The combination of properties opens the door for designs 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 leads to ceramics with fine grain sizes.This affords the opportunity to investigate, the effects of dopant type and dopant concentration 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 | Materials

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