INFLUENCE OF ZRO2 ADDITION ON THE CRYSTALLIZATION OF YTTRIUM OXYNITRIDE GLASSES TO Y3AL5O12-BASED GLASS-CERAMICS

The influence of a ZrO2 addition (6 wt%) on the crystallization behavi our of a glass with potential for crystallization to Y3Al5O12-based gl ass-ceramics has been investigated. Differential thermal analysis, X-r ay diffraction and scanning electron microscopy were used to assess th e crystallization process. Vickers hardness was used to monitor change s in the crystallized volume fraction at different heat treatment temp eratures. The results indicate that the addition of ZrO, to the invest igated glass composition promotes the formation of the y-Y2Si2O7 and i nhibits the crystallization of the Y3Al5O12 phase. (C) 1997 Elsevier S cience Limited. All rights reserved.