Yttria Sintering Aid for Si3N4 Ceramics
CAS Number: 1314-36-9
Yttrium oxide (Y2O3) is the primary sintering aid for silicon nitride (Si3N4) and sialon ceramics, typically used together with Al2O3 or MgO. Y2O3 reacts with the surface oxide layer on Si3N4 particles to form a liquid-phase oxynitride glass that facilitates densification at 1700–1800 °C. The resulting intergranular glass phase determines the high-temperature mechanical properties of the sintered body.
Technical Specifications
| appearance | White fine powder |
| purity (%) | ≥99.9 |
| Y2O3 content (%) | ≥99.9 |
| surface area (m²/g) | 3–15 |
| D50 particle size (µm) | 0.5–2.0 |
Applications
- Sintering aid for pressureless sintered Si3N4 ceramics
- Additive for hot-pressed and HIP Si3N4 structural parts
- Co-sintering aid in sialon ceramic systems
- Stabilizer for YSZ electrolyte in SOFC applications
- Sintering aid for transparent YAG ceramic lasers
Key Features
- Forms liquid phase with SiO2 enabling low-temperature densification of Si3N4
- Controls intergranular glass composition for optimized high-temperature properties
- High purity minimizes contamination in electronic and optical ceramics
- Multiple grades from coarse to submicron for various processing routes
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CAS Number
1314-36-9
Category
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