The influences of cations on the properties of Y–Mg–Si–Al–O–N glasses

• Published in: Journal of non-crystalline solids 2008-08, Vol.354 (31), p.3678-3684
• Main Authors: Li, X.Y., Lu, A.X., Xiao, Zh.H., Zuo, Ch.G.
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Disordered solids; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Glass transitions; Glasses; Oxynitride glasses; Physics; Specific phase transitions; Structure of solids and liquids; crystallography; Transition metals
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2008.04.002

Two series (A and B series) of oxynitride glasses were prepared by melting batches at 1580 °C for 3 h under local CO reducing atmosphere in a Si–Mo-heated resistance furnace. Nominal compositions of A and B series glasses in equivalent percent (eq.%) are (28− x)Y: xMg:48Si:24Al:83O:17N and (28− x)Y: xMg:56Si:16Al:83O:17N ( x = 0, 7, 14, 21), respectively. The influences of Mg/Y and Al/Si ratios on the properties such as glass transition temperature ( T g), crystallization temperature ( T C), knoop hardness ( H), three-point bending strength ( σ) and chemical durability in 20%HF were investigated. At the same time, the relationship between these properties and the structures of the glasses were discussed. At constant ratio Si–Al–O–N, T g decreases nonlinearly but glass leaching ratio increases linearly with increasing Mg/Y ratio. However, H and σ increase first and then decrease as the Mg/Y ratio increases. When the Y/Mg/O/N ratio is constant, T g decreases slightly but H and σ increase slightly as the Al/Si ratio increases.