Standard MBE Crucible (PBN 125 54)

PBN Crucible is produced by CVD process (chemical vapor deposition) to create its solid body and all the boron nitride crystals grow parallel to the surface of which the vapor is deposited on. Due to the nature of CVD process, thick wall products (>3mm) is usually not available. PBN is also a good choice for extremely high purity boron nitride. As the purity of gas material (BCl3 + NH3 --> BN +HCl) is a lot higher than regular boron nitride powder, purity for PBN is quite high and 99.99% is the typical grade. With it's high purity, high mechanical strength, high performance with molten metal and salts, PBN is becoming an widely used material in high vacuum processes. Without showing melting point and high thermal conductivity, pyrolytic material are ideal to be used as vacuum furnace parts. The CVD process give this pyrolytic boron nitride almost perfect layered structure, which leads to anisotropic thermal conductivity, making it an ideal material to make crucibles for crystal growing. Vertical gradient freeze method (VGF) is a popular technology for crystal production and the PBN VGF crucibles are specialized consumption for this type of process.

The pyrolytic boron nitride plates, are cut from 1mm 2mm or 3mm thick PBN discs with about 10~14" diameter. The diameter of raw material PBN was limited by equipment size but the finished PBN products could be machined to highly customized shape with competitive cost.

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