Effects of calcination atmosphere on monodispersed spherical particles for highly optical transparent yttria ceramics

Abstract

Highly sinterable powders are required for the fabrication of transparent ceramics. Here, we studied the effects of calcination atmosphere on the characteristics of monodispersed spherical Y2O3 powders, such as crystallite size and particle density, for high optical transparent ceramics. It was found that vacuum calcination around the crystallization temperature is the crucial step to eliminate intragranular pores in the spherical particle. The fast decomposition rate in a vacuum creates smaller crystallites, and the following higher calcination temperature results in the enhancement of pore elimination. The in‐line transmittance of the transparent Y2O3 ceramics, vacuum sintered at 1750°C, was improved by increasing the particle density of the as‐calcined powders. This result indicates that the high‐density starting particles effectively enhance the pore elimination during the fabrication of transparent Y2O3 ceramics.

Fabrication and characterization of transparent sesquioxide laser ceramics

“…Jung et al studied the effects of calcination atmosphere on Y2O3 particles. 43 They found that vacuum calcination is a crucial step to realize a dense spherical Y2O3 particle. After calcined at 1100 °C under vacuum, the pores inside the synthesized particles were notably reduced and the sinterability of Y2O3 was obviously promoted.…”

Fabrication of er-doped sesquioxide laser ceramics and their laser performance

“…the melting temperature for Y2O3 is ~ 2430 ℃. 124 Using conventional crystal growth technology to fabricate sesquioxide single crystals is very challenging. 125 In view of their importance for high power lasers, different research groups in the world have intensively investigated on the fabrication technology for sesquioxide-based laser ceramics with high quality.…”