Si<sub>3</sub>N<sub>4</sub>-Y<sub>2</sub>O<sub>3</sub>-AlN系より合成したY-α'-Sialonの熱的安定性

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  • Thermal Stability of Y-α′-Sialon Prepared from Si<sub>3</sub>N<sub>4</sub>-Y<sub>2</sub>O<sub>3</sub>-AlN
  • Si3N4 Y2O3 AlNケイ ヨリ ゴウセイシタ Y アルファ Sialo

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Sialon composites composed of Y-α′-sialon and β′-sialon obtained by hot-pressing powder mixtures of Si3N4, Y2O3 and AlN, were annealed at 1850°C to investigate the thermal stability of Y-α′-sialon. The amount of Y-α′-sialon was reduced and it was transformed into β′-sialon. When the transformation proceeded, Y and N were excluded to grain boundaries and their concentration at grain boundaries increases with time. It is considered that these elements then diffuse to the remaining Y-α′-sialon and dissolve again, resulting in an increase in lattice constants (solubility) of the remaining Y-α′-sialon with time.

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