Due to the nature of the CVD process, PBN parts generally are requested a wall thickness not more than 3mm. PBN is also a good choice for the extremely high purity of boron nitride. 99.99% is the typical grade. The CVD process gives this pyrolytic boron nitride an almost perfect layered structure, which leads to anisotropic thermal conductivity, making it an ideal material to make crucibles for crystal growing.
Pyrolytic Boron Nitride Ceramics Applications:
- Crystal growth (VGF, LEC Crucible)
- Molecular Beam Epitaxy(MBE) Crucible
- MOCVD Heater
- PBN Infrared Window
- Traveling Wave Tube (TWT) (PBN Support Rod)
- PBN Coating Graphite
- High temperature, vacuum equipment insulator
Pyrolytic Boron Nitride Ceramics Characteristic:
- The color of PBN is ivory and orange-brown, nontoxic, imporosity, easy processing.
- The purity is up to 99.99%, surface densification, good gas barrier properties.
- The strength increases as the temperature rises and peaked at 2200°C.
- Acid, alkali, salt, and organic reagent resistance. Meanwhile, it does not react with the majority of molten metal and semiconductor material.
- Excellent thermal shock resistance, excellent thermal conductivity, low thermal expansion coefficient.
- High resistance, high dielectric strength, low dielectric constant, low dissipation factor, excellent microwave, and infrared ray ability.
- It’s with anisotropy in the mechanics, heat, and electricity.
Pyrolytic Boron Nitride Ceramics Properties:
| Property | Unit | Value | |
| Lattice constant | μm | a: 2.504 x 10^-10 c: 6.692 x 10^-10 | |
| Density | g/cm3 | 2.10-2.15 (PBN Crucible); 2.15-2.19 (PBN Plates) | |
| Micro hardness (Knoop)(ab side) | N/mm2 | 691.88 | |
| Resistivity | Ω*cm | 3.11 x 10^11 | |
| Tensile strength | N/mm2 | 153.86 | |
| Bending strength | ⊥C | N/mm2 | 243.63 |
| ⊥C | N/mm2 | 197.76 | |
| Elastic modulus | N/mm2 | 235690 | |
| Thermal conductivity | W/m*k | “a” direction “c” direction | |
| 200°C | W/m*k | 60 2.60 | |
| 900°C | W/m*k | 43.7 2.8 | |
| Dielectric strength (at room temperature) | KV/mm | 56 | |
Declaration: This is an original article of INNOVACERA®. Please indicate the source link when reprinting: https://www.innovacera.com/product/pyrolytic-boron-nitride
Frequently Asked Questions
Why is pyrolytic boron nitride (PBN) ideal for crystal growth and MBE? How does its anisotropic structure benefit thermal control?
CVD-synthesized pyrolytic boron nitride (PBN) features 99.99% ultra-high purity, zero porosity, and complete chemical inertness to molten metals and semiconductor compounds. Its layered hexagonal crystal structure provides distinct anisotropic thermal conductivity—distributing heat uniformly along the plane while insulating perpendicular to it. With mechanical strength that actually increases up to 2200°C, PBN eliminates batch contamination and thermal gradient defects in VGF, LEC, and Molecular Beam Epitaxy (MBE) processes.
Can I buy custom PBN crucibles and MOCVD heater plates? What design parameters are needed by the manufacturer?
Yes, as a dedicated advanced ceramic manufacturer, INNOVACERA fabricates custom PBN crucibles, MOCVD heaters, infrared windows, and traveling wave tube (TWT) support rods. Because PBN is produced through a chemical vapor deposition (CVD) process, components typically feature uniform wall thicknesses up to 3 mm. To get a competitive price quotation, please provide your CAD drawings, dimensional tolerances, operating temperature, and vacuum level requirements.
