Pyrolytic Boron Nitride Crucibles
Introduction
Pyrolytic BN or PBN is short for pyrolytic boron nitride. It is a type of hexagonal boron nitride created by the chemical vapor deposition (CVD) method, is also an extremely pure boron nitride that can reach more than 99.99%, covering almost no porosity.
Structure
As described above, pyrolytic boron nitride (PBN) is a member of the hexagonal system. The intra-layer atomic spacing is 1.45 and the inter-layer atomic spacing is 3.33, which is a significant difference. The stacking mechanism for the PBN is ababab, and the structure is made up of alternating B and N atoms in the layer and along the C axis, respectively.
Advantage
The PBN material is extremely resistant to thermal shock and has a highly anisotropic (directionally dependent) thermal transport. Additionally, PBN makes a superior electrical insulator. The substance is stable in inert, reducing, and oxidizing atmospheres up to 2800°C and 850°C, respectively.
In terms of product, PBN may be formed into 2D or 3D objects like crucibles, boats, plates, wafers, tubes, and bottles, or it can be applied as a coating to graphite. The majority of molten metals (Al, Ag, Cu, Ga, Ge, Sn, etc.), acid, and hot ammonia are among the situations where PBN demonstrates exceptional temperature stability when coated on graphite up to 1700°C, resists thermal shock, and resists gas corrosion.
Product
PBN Crucible: The PBN crucible is the most appropriate container for the formation of compound semiconductor single crystals, and it cannot be replaced;
In the MBE process, it is the ideal container for evaporating elements and compounds;
Also, the pyrolytic boron nitride crucible is utilized as an evaporation element container in OLED production lines.
PG/PBN Heater: PBN heaters potential applications include MOCVD heating, Metal heating, evaporation heating, superconductor substrate heating, sample analysis heating, electron microscope sample heating, semiconductor substrate heating, and so on.
PBN Sheet/Ring: PBN has exceptional properties at high temperatures, like its high purity and the ability to withstand heating to 2300 °C in an ultra-high vacuum without decomposing. Besides, it does not emit gas contaminants. These kinds of properties also allow PBN to be processed into a variety of geometries.
PBN Coated Graphite: PBN has the potential to be an effective fluoride salt wetted material that, when applied to graphite, might stop the interactions between the materials. Thus, it is frequently used to protect the graphite components in machines.
PBN Material in the TFPV process
Utilization of the PBN material in the TFPV(thin film photovoltaic) process helps reduce the cost of deposition and increases the efficiency of the resulting PV cells, making solar electricity as cheap to create as carbon-based methods.
Conclusion
Many industries find considerable use for pyrolytic boron nitride. Its widespread use can be attributed to some of its fantastic qualities, including excellent purity and corrosion resistance. The potential applications of pyrolytic boron nitride in various fields are still being studied.
