Ai Calcia-Stabilised Zirconia Crucibles for High-Temperature Processing
Across International’s Ai zirconia crucibles are manufactured from calcia-stabilised zirconium dioxide (ZrO₂ + CaO) for high-temperature laboratory and industrial processing. Produced using a formulated refractory composition and high-temperature sintering, these crucibles combine high-temperature resistance with resistance to chemical attack.
The material contains at least 98.5% combined ZrO₂ and CaO, with controlled levels of silica, alumina, iron oxide and titanium dioxide. Available in different cylindrical sizes, the crucibles can be selected to suit the sample volume and furnace working space.
Key Features
Calcia-stabilised zirconia: ZrO₂-based refractory material stabilised with CaO.
High-temperature capability: Manufacturer-stated temperature capability of ≥2,300°C, subject to application-specific confirmation.
Chemical corrosion resistance: Suitable for compatible materials and processing atmospheres.
Controlled composition: Combined ZrO₂ + CaO content ≥98.5%.
Sintered ceramic construction: Manufactured for demanding thermal processing applications.
Multiple size options: Cylindrical crucibles for different sample volumes and furnace configurations.
Applications
Suitable applications include high-temperature materials research and thermal processing associated with:
Advanced ceramics.
Ceramic capacitors and electronic components.
Sensor materials.
Magnetic materials.
Chip inductors and related ceramic components.
Crucible selection should account for the sample chemistry, furnace atmosphere, operating temperature and heating cycle.
Chemical Composition
| Component | Specified Content |
|---|---|
| Zirconia + calcium oxide, ZrO₂ + CaO | ≥98.5% |
| Silicon dioxide, SiO₂ | ≤0.4% |
| Aluminium oxide, Al₂O₃ | ≤0.4% |
| Iron oxide, Fe₂O₃ | ≤0.1% |
| Titanium dioxide, TiO₂ | ≤0.1% |
The ≥98.5% value refers to combined ZrO₂ and CaO content, rather than zirconia purity alone.
Material Properties
| Property | Specification |
|---|---|
| Material | Calcia-stabilised zirconia |
| Manufacturing process | High-temperature sintering |
| Manufacturer-stated temperature capability | ≥2,300°C* |
| Apparent porosity | 20–29% |
| Linear thermal expansion at 1,000°C | 0.7–0.8% |
| Flexural strength | ≥20 MPa |
| Bulk density | 4.2–4.6 g/cm³ |
| Refractoriness under load | ≥1,650°C |
| Form | Cylindrical, open-top crucible |
Selection & Operating Notes
Confirm the required internal diameter, external diameter, height and capacity when ordering. Chemical compatibility and the permissible operating temperature must be assessed for the intended process.
The stated ≥2,300°C temperature capability is supplied by the manufacturer and is not a confirmed continuous operating rating. Refractoriness under load is a separate material property. Confirm suitability for the intended temperature, load, atmosphere and exposure time before use.