Magnesium Oxide Sintering Aid for Alumina
CAS Number: 1309-48-4
High-purity magnesium oxide (MgO) is the most widely used sintering aid for translucent and high-density alumina ceramics. Trace additions of 250–500 ppm MgO suppress abnormal grain growth during sintering by segregating at Al2O3 grain boundaries, enabling near-theoretical density at lower temperatures. It is essential for transparent alumina (Lucalox) and 99.9% purity alumina substrates.
Technical Specifications
| appearance | White fine powder |
| purity (%) | ≥99.5 |
| SiO2 content (%) | ≤0.02 |
| surface area (m²/g) | 10–80 |
| D50 particle size (µm) | 0.2–1.0 |
Applications
- Grain growth inhibitor in high-purity alumina sintering
- Sintering aid for translucent alumina arc tubes and substrates
- Dopant for alumina to achieve near-theoretical density
- Additive in alumina-based refractory materials
- Component in magnesia-alumina spinel ceramic formulations
Key Features
- Suppresses abnormal grain growth enabling uniform fine microstructure
- Enables near-theoretical density sintering at 1600–1650 °C
- Ultra-low addition levels (250–500 ppm) minimize secondary phase
- High surface area grades ensure homogeneous distribution in slurry
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CAS Number
1309-48-4
Category
Ceramic / Glass AdditivesAvailability
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