The Intergranular Oxynitride Microstructure in Silicon Nitride Based Ceramics

Abstract:

The intergranular microstructure in a liquid phase sintered silicon nitride based ceramic may be viewed as an oxynitride glass-ceramic. This work is concerned with the incorporation of yttrium B-phase, which is a five-component phase, into the intergranular regions of silicon nitride ceramics. The silicon nitride materials were fabricated with the addition of a powdered B-phase parent glass with composition (e/o) 35Y:45Si:20Al:83O:17N, or the addition of a mixture of Y2O3, SiO2 and Al2O3 with cation composition (e/o) 35Y:45Si:20Al. The starting powder mixtures contained 10 wt% of sintering additives. Sintering for 2 h at 1800°C was followed by a two-step post-densification heat treatment in order to promote nucleation and growth of yttrium B-phase. Detailed imaging and elemental analysis of the intergranular regions was carried out by EDX in a FEGTEM.

• Periodical: Materials Science Forum (Volume 554)
• Pages: 113-118
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.554.113
• Online since: August 2007
• Authors: L.K.L. Falk, N. Schneider, Yvonne Menke, Stuart Hampshire
• Keywords: B-Phase, Energy Dispersive X-Ray (EDX), Intergranular Microstructure, TEM

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