PBN (Pyrolytic Boron Nitride) crucibles are high-purity ceramic crucibles that are made using the pyrolysis process of a boron-containing gas in a nitrogen environment. These crucibles are known for their high purity, high-temperature resistance, and excellent thermal and electrical insulation properties.
| Property | Value |
|---|---|
| Thermal conductivity | 25-300 W/mK |
| Coefficient of thermal expansion (CTE) | 2.3-2.7 ppm/K |
| Density | 1.9-2.1 g/cm³ |
| Hardness | 7-9 Mohs |
| Maximum service temperature | 1,800-2,200°C |
| Dielectric constant | 2.2-3.6 |
| Transparency | Transparent in IR |
| Chemical stability | Chemically inert |
| Refractive index | 1.7-1.9 |