The Intergranular Oxynitride Microstructure in Silicon Nitride Based Ceramics

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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.

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Edited by:

Hasan Mandal

Pages:

113-118

Citation:

L.K.L. Falk et al., "The Intergranular Oxynitride Microstructure in Silicon Nitride Based Ceramics", Materials Science Forum, Vol. 554, pp. 113-118, 2007

Online since:

August 2007

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$38.00

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