High Purity Alumina Ceramic Insulation Frame is a rigid structural insulator made from high-purity alumina (typically 99.5–99.8% Al₂O₃). It is machined into a frame or window shape and used to separate and support conductive parts while providing electrical insulation, thermal stability and dimensional accuracy in high-voltage, high-temperature or vacuum equipment such as power modules, laser systems and advanced industrial machines.
High Purity Alumina Insulation Frame Benefits
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99.8% high purity alumina body – uses a material grade that offers improved electrical insulation, thermal stability and mechanical strength compared with lower purity alumina, which is documented for use in demanding applications.
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Designed for high pulse-rate current and high voltage – the frame relies on alumina’s electric strength in the tens of kV/mm and high volume resistivity to withstand pulsed electric fields in compact layouts when creepage and clearance distances are correctly designed.
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Resistant to repeated high temperature shocks – thermal properties of 99.8% alumina, including maximum use temperature near 1700°C and moderate CTE, allow the frame to survive repeated start-up and process cycles without significant warping or loss of insulation.
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Low outgassing and vacuum compatibility – high purity alumina components are noted for low outgassing behaviour in vacuum, which helps avoid contamination of laser gases and process chambers.
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Clean geometry for semiconductor-grade assemblies – large-size frames are ground and machined to maintain flatness and edge quality, limiting particle generation and local field concentration in semiconductor modules and other precision systems.
High Purity Alumina Ceramic Insulation Frame Properties
| Property | Unit | 99.5% Al₂O₃ | 99.6% Al₂O₃ | 99.7% Al₂O₃ | 99.8% Al₂O₃ | 99.9% Al₂O₃ | 99.99% Al₂O₃ |
| Alumina content | % | 99.5 | 99.6 | 99.7 | 99.8 | 99.9 | 99.99 |
| Density | g/cm³ | 3.89 | 3.91 | 3.92 | 3.93 | 3.94 | 3.98 |
| Open porosity | % | 0 | – | – | – | – | – |
| Color | – | Ivory | Ivory | Ivory | Ivory | Ivory | Ivory |
| Water absorption | % | – | 0 | 0 | 0 | 0 | 0 |
| Young’s modulus (Elastic modulus) | GPa | 375 | 356 | 357 | 358 | 359 | 362 |
| Shear modulus | GPa | 152 | – | – | – | – | – |
| Bulk modulus | GPa | 228 | – | – | – | – | – |
| Poisson’s ratio | – | 0.22 | – | – | – | – | – |
| Compressive strength | MPa | 2600 | 2552 | 2554 | 2556 | 2558 | 2570 |
| Flexural strength | MPa | 379 | 312 | 313 | 314 | 315 | 320 |
| Fracture toughness | MPa·m¹ᐟ² | 4 | – | – | – | – | – |
| Hardness | GPa | 14.1 (≈1440 kg/mm²) | 23 | 24 | 25 | 26 | 30 |
| Thermal conductivity | W/m·K | 35 | 32–37 | 33–38 | 34–39 | 35–40 | 36–42 |
| Thermal shock resistance ΔT | °C | – | 222 | 223 | 224 | 225 | 228 |
| Maximum use temperature (no load) | °C | ≤1750 | 1755 | 1760 | 1765 | 1770 | 1800 |
| Coefficient of thermal expansion | 10⁻⁶/°C | 8.4 | – | – | – | – | – |
| Specific heat | J/kg·K | 880 | – | – | – | – | – |
| Volume resistivity | Ω·cm | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ |
| Dielectric constant (relative permittivity) | – | 9.8 | 9.83 | 9.84 | 9.85 | 9.86 | 9.92 |
| Dielectric strength | kV/mm | 16.9 | 23.2 | 23.4 | 23.6 | 23.8 | 24 |
| Dissipation factor (loss factor @ 1 kHz) | – | 0.0002 | – | – | – | – | – |
High Purity Alumina Insulation Frame Specification
| High Purity Alumina Insulation Frame | ||
| Item No. | Diameter (mm) | Thickness (mm) |
| AT-HP-K01 | Customize | |
High Purity Alumina Insulation Frame Packaging
- Each alumina ceramic insulation frame is individually separated using foam or soft interlayers to avoid ceramic-to-ceramic contact.
- Parts are packed in clean PE bags and then located in custom cut foam or honeycomb cartons to minimize movement during transport.
