Title

Microstructural Evolution in Near-eutectic Yttrium Silicate Compositions Fabricated from a Bulk Melt and as an Intergranular Phase in Silicon Nitride

Abstract

Near-eutectic composition Y2O3─SiO2 melts were formed as bulk samples or as an intergranular phase in Si3N4. Upon cooling to room temperature the bulk material partially crystallized to γ-Y2-Si2O7 whereas the intergranular phase was glass. on heat-treating at 1500°C the bulk material transformed to γ-Y2Si2O7 whereas the intergranular glass crystallized first to γ-Y2Si2O7 and then to β-Y2Si2O7. Possible reasons for the different behavior are discussed.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Crystallization; Glass; Yttria; Silica; Silicon Nitride

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1990 Wiley-Blackwell, All rights reserved.


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