Calcium Oxide Ceramic Sintering Aid
CAS Number: 1305-78-8
Calcium oxide (CaO) is a reactive sintering aid used in BaTiO3-based dielectric ceramics, calcia-stabilized zirconia, and Si3N4 ceramics. In BaTiO3, CaO modifies grain growth kinetics and lowers sintering temperature. In zirconia, CaO (3–8 mol%) stabilizes the cubic phase for oxygen ion conductors. CaO must be handled carefully due to its strong hygroscopicity and exothermic reaction with water.
Technical Specifications
| appearance | White powder |
| purity (%) | ≥98 |
| moisture (%) | ≤0.5 (freshly calcined) |
| CaO content (%) | ≥98 |
| D50 particle size (µm) | 1.0–5.0 |
Applications
- Sintering aid and dopant in BaTiO3 dielectric ceramics
- Stabilizer for calcia-stabilized zirconia (CSZ) electrolytes
- Co-additive in Si3N4 and sialon sintering systems
- Flux in traditional ceramic and porcelain glazes
- Reactive filler in calcium silicate insulation boards
Key Features
- Highly reactive—enables low-temperature densification in BaTiO3 ceramics
- Stabilizes cubic zirconia phase for ionic conductivity applications
- Must be stored in sealed containers to prevent moisture absorption
- Calcination temperature controls reactivity and particle size
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CAS Number
1305-78-8
Category
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