CG MATERIAL
PBN Tube, Pyrolytic Boron Nitride Tube
PBN Tube, Pyrolytic Boron Nitride Tube
Pyrolytic Boron Nitride (PBN) Tube is a high-performance ceramic tube that is commonly used in high-temperature and high-vacuum applications. It is made from boron nitride powder by a chemical vapor deposition process that results in a dense, uniform, and isotropic structure.
PBN tubes are known for their excellent thermal stability, high thermal conductivity, and low thermal expansion coefficient. They can withstand temperatures up to 1800°C in an inert atmosphere and up to 1400°C in air. They are also highly resistant to chemical corrosion and do not react with most molten metals, making them an ideal choice for semiconductor and high-tech industry applications.
PBN tubes are available in various sizes and shapes, including round, rectangular, and custom shapes. They are often used as insulation tubes, heater tubes, and protective tubes in high-temperature furnaces, as well as in semiconductor manufacturing equipment, aerospace and defense, and medical devices.
Comparison of Boron Nitride Ceramics
| Grade | BN-BO | BN-SZ | BN-AlN |
| Compositions | BN>98% | BN+SiC+ZrO2 | BN+AIN |
| Binder | B2O3 | / | AlBO3 |
| Density | 2.1-2.2 g/cm3 | 2.3-3.0 g/cm3 | 2.5-2.6 g/cm3 |
| 25°C Volume Resistivity | >1013 Ω·cm | >1012 Ω·cm | >1014 Ω·cm |
| Max. Service Temp. (°C) Oxygen; Inert Gas; High Vacuum |
900 2000 1800 |
900 1700 1700 |
900 2100 1900 |
| Flexural Strength | 75 Mpa | 100 Mpa | 130 Mpa |
| Compressive Strength | 100 Mpa | 300 Mpa | 250 Mpa |
| Coefficient of Thermal Expansion 25-1000°C |
2.0 x 10–6/K | 4.0 x 10–6/K | 4.5 x 10–6/K |
| Thermal Conductivity | 30 W/mK | 40 W/mK | 60 W/mK |
PBN Tube Properties
| Compound Formula | BN |
| Molecular Weight | 24.82 |
| Appearance | White |
| Melting Point | 2973 °C |
| Density | 2.1 g/cm3 (h-BN); 3.45 g/cm3 (c-BN) |
| Solubility in H2O | Insoluble |
| Refractive Index | 1.8 (h-BN); 2.1 (c-BN) |
| Electrical Resistivity | 13 to 15 10x Ω-m |
PBN Tube Applications
Boron Nitride ceramic from CG Material can withstand high temperature in a high vacuum environment, plus it has excellent corrosion resistance and electrical resistance. Thus, Boron Nitride ceramic product is an ideal choice in a wide range of industries, such as:
– Crucibles for crystal growth
– Break rings for horizontal casting machine
– Insulators for high-temperature furnace
– Electric insulators in vacuum system
– Feed through for high voltage equipment
Packaging
We handle our products with care to ensure they remain in their original condition during storage and transportation and to preserve their quality.
