Premium
Properties of Nitrogen‐Containing Yttria—Alumina—Silica Melts and Glasses
Author(s) -
Saito Noritaka,
Kai Kentaro,
Furusho Shingo,
Nakashima Kunihiko,
Mori Katsumi,
Shimizu Fumiyuki
Publication year - 2003
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2003.tb03362.x
Subject(s) - viscosity , solubility , nitrogen , yttrium , vickers hardness test , aluminosilicate , materials science , oxygen , inorganic chemistry , mineralogy , chemical engineering , chemistry , metallurgy , composite material , oxide , organic chemistry , microstructure , catalysis , engineering
The viscosity and solubility of nitrogen in Y 2 O 3 –Al 2 O 3 –SiO 2 melts have been systematically examined. The effects of nitrogen content on viscosity for Y‐Al‐Si‐O‐N melts and on Vickers hardness of oxynitride glasses also have been examined. Although the viscosity of Y 2 O 3 –Al 2 O 3 –SiO 2 melts was decreased, the solubility of nitrogen into the melts was increased with increased Y 2 O 3 content. These results indicated that the yttrium ion behaved as a network modifier. Therefore, the structural units for viscous flow became small, and the amount of nonbridging oxygen increased in the melts when the Y 2 O 3 content increased. The viscosity of Y‐Al‐Si‐O‐N melts and Vickers hardness of oxynitride glasses remarkably increased with increased nitrogen content. These results suggested that the substitution of nitrogen for oxygen in the melts may have led to a high average coordination of nonmetal atoms and that the increased cross‐linking produced a more rigid glass network.