Pyrolytic Boron Nitride (PBN) is a high-purity material derived from hexagonal boron nitride (hBN) using a chemical vapor deposition (CVD) process. This method aligns boron nitride crystals parallel to the substrate, resulting in exceptional purity (99.99%) and durability. PBN’s CVD structure limits wall thickness to 3mm but provides high mechanical strength, making it ideal for high-vacuum environments and molten metal applications.
Its unique thermal properties, such as anisotropic thermal conductivity and resistance to high temperatures, make PBN the preferred material for vacuum furnace components and crystal growth crucibles. In molecular beam epitaxy (MBE), a standard process for gallium arsenide (GaAs) crystal production, PBN crucibles excel due to their superior performance.
Key properties of PBN include:
- Excellent thermal conductivity
- High insulation resistance
- Exceptional dielectric strength across a broad temperature range
- Ultra-high purity
- Non-wettability
- Non-toxic and chemically inert
- Resistance to high temperatures and thermal shock
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Frequently Asked Questions
Looking for an ultra-high purity PBN crucibles manufacturer? How do CVD PBN crucibles eliminate contamination in MBE chambers?
During molecular beam epitaxy (MBE) and III-V compound semiconductor growth (such as GaAs and InP), crucible outgassing and melt wetting cause fatal crystal defects and low yields. INNOVACERA manufactures CVD Pyrolytic Boron Nitride (PBN) crucibles with 99.99% ultra-high purity and an aligned laminar crystal structure. Chemically inert and non-wetting to molten gallium, arsenic, and indium, our PBN vessels prevent melt adhesion, resist severe thermal shock, and ensure near-zero background outgassing in ultra-high vacuum (UHV).
Need custom PBN crucibles for MBE effusion cells or crystal pullers? What vessel geometries and wall thicknesses can you supply?
INNOVACERA supplies custom PBN crucibles compatible with all major MBE system manufacturers (including Veeco, Riber, and DCA) as well as VGF and LEC crystal furnaces. We manufacture cylindrical, conical, stepped, and lip-type crucibles with wall thicknesses up to 3 mm, along with matching PBN heater plates, filament rings, and thermal shields machined precisely to your vacuum chamber CAD drawings.
