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ChemInform Abstract: Oxidation Resistance of Nd—Si—Al—O—N Glasses and Glass-Ceramics.

✍ Scribed by M. SEBAI; C. PENOT; P. GOURSAT; K. LIDDELL; D. P. THOMPSON; E. NESTOR; R. RAMESH; S. HAMPSHIRE

Publisher
John Wiley and Sons
Year
2010
Weight
30 KB
Volume
29
Category
Article
ISSN
0931-7597

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✦ Synopsis

Oxidation Resistance of Nd-Si-Al-O-N Glasses and Glass-Ceramics.

-Oxynitride glasses which crystallize in single and multiphase products in the Nd-Si-Al-O-N system are prepared from mixtures of silicon nitride powder with high purity oxides (Al 2 O 3 , Nd 2 O 3 , SiO 2 ) followed by melting of the pellets (graphite crucible, N 2 , 1700 • C, 1 h) and annealing at 850-900 • C for 1 h. The crystalline phases formed depend on both the composition of the parent glass and the heat-treatment conditions. The U-phase (Nd 3 Si 3 Al 3 O 12 N 2 ) is stable at 1150 • C for various crystallization times. Sialon glasses oxidize rapidly in air at a temperature above the glass transition temperature by forming a porous oxide scale, due to the evolution of gaseous species at the internal interface.

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