Preparation of translucent YAG glass/ceramic at temperatures below 900 °C. Issue 7 (July 2020)

• Record Type: Journal Article
• Authors: Michálková, Monika; Kraxner, Jozef; Michálek, Martin; Galusek, Dušan
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 7(2020)
• Page Start: 2581
• Page End: 2585
• Publication Date: 2020-07
• Subjects: Flame synthesis -- Glass-ceramic -- Hot-press -- Microspheres -- YAG; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2019.11.011
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The work presented here deals with the preparation of bulk yttrium aluminium garnet (YAG) glass-ceramics and YAG ceramics from glass microspheres with a YAG composition. Sol-gel prepared YAG powder was fed into a high temperature methane-oxygen flame where the particles melted and glass microspheres, with a YAG composition, were formed. Viscous flow sintering of the microspheres was then performed to prepare bulk YAG glass-ceramics or ceramics in a hot press. Rapid crystallization of YAG glass was traced during hot pressing through a change in the heating rate slope due to release of latent (crystallization) heat. This allowed control of crystallization and enabled preparation of YAG-based materials with different amounts of residual glass. YAG ceramic with relative density of 94.2 % was prepared at 891 °C without isothermal heating; additionally, YAG glass-ceramic reached relative density > 99 % at temperature 815 °C without isothermal heating.