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

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...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1990-12, Vol.73 (12), p.3575-3579
Main Authors: Lee, William E., Drummond III, Charles H., Hilmas, Gregory E., Kumar, Suresh
Format: Article
Language:English
Subjects:
360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication
Applied sciences
Building materials. Ceramics. Glasses
CHALCOGENIDES
Chemical industry and chemicals
CRYSTAL STRUCTURE
CRYSTALLIZATION
Exact sciences and technology
glass
Glass-ceramics
Glasses
MATERIALS SCIENCE
MICROSTRUCTURE
MINERALS
NITRIDES
NITROGEN COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PNICTIDES
SILICA
SILICATES
SILICON COMPOUNDS
silicon nitride
SILICON NITRIDES
SILICON OXIDES
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
yttria
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
YTTRIUM SILICATES
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Description
Summary: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.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1990.tb04260.x