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Meeting Materials Science & Technology 2019
Symposium Ceramic and Crystal Materials for Optics and Photonics
Presentation Title Sintering of Nanocrystalline Transparent Zinc Aluminate
Author(s) Chenguang Yang, Andrew Thron, Ricardo Castro
On-Site Speaker (Planned) Ricardo Castro
Abstract Scope Zinc aluminate (ZnAl2O4) is a spinel structure oxide with potential application for lasers and other optical devices. In this presentation we present data on the densifcation of zinc aluminate ceramics using Deformable Punch Spark Plasma Sintering. The technique allows usage of high pressures within a rapid heating cycle, allowing particles to densify without significant grain growth. Fully dense samples were obtained with grain sizes ranging from 10 to 50nm with high levels of transparency. Hardness was measured using Vickers indentation tests, and hardening was observed with grain refinement, following a Hall-Petch relation with hardness as high as 23GPa measured for the smallest grain sizes.


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