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Porous high-alumina saggers: Specifically designed for calcining high-purity alumina powder. Fired at a high temperature of 1800℃, they feature a low expansion coefficient and ultra-high purity, effectively assisting the powder in draining water and removing binders to ensure calcination quality.
Characteristics of Porous Saggers
Porous high-alumina saggers are used for calcining high-purity alumina powder. The saggers need to be fired at a high temperature of 1800℃. They are produced using 99.9% high-purity alumina (Al₂O₃) and low-sodium white corundum, etc. The binder used has low ash content (ash content ≤ 0.01%). In the entire raw material control process, we ensure effective control of impurities, and stabilize the activity of Al₂O₃ through sufficient high-temperature firing. This achieves a low thermal expansion coefficient and extremely high-purity chemical properties, making them suitable for calcining high-purity ceramic powders.
The presence of effective pores creates a siphon effect that assists in draining water and removing binders during the low-temperature calcination of ceramic powders, enabling the most thorough and effective removal of organic substances.
| Item/Property | Value/Specification |
|---|---|
| Al₂O₃ (%) | 89.35 |
| SiO₂ (%) | 10.45 |
| Fe₂O₃ (%) | 0.06 |
| Na₂O + K₂O (%) | ≤ 0.15 |
| Service Temperature (°C) | 1650 |
| Thermal Expansion Coefficient at 1000°C (×10⁻⁶/°C) | 5.6 |
| Porosity (%) | 23 |
| Bulk Density (g/cm³) | 2.95 |
| Application | Calcination of high-purity ceramic powders |
