Boron nitride (particularly the hexagonal boron nitride commonly used in industry) is an advanced synthetic ceramic material and a high-temperature-resistant industrial ceramic.
In its solid form, it is often referred to as “white graphite” due to its flake-like microstructure. Unlike conventional black graphite, however, boron nitride is an excellent electrical insulator and has a significantly higher oxidation temperature.
The material is regarded in the industry as a true all-rounder, as it combines a unique set of physical, thermal, and electrical properties:
- Extreme temperature resistance: In an inert (oxygen-free) or reducing environment, boron nitride can easily withstand temperatures exceeding 2,000 °C.
- Outstanding thermal management: It offers excellent thermal conductivity and high thermal capacity, combined with very low thermal expansion.
- Electrical insulation: The material has a low dielectric constant and excellent dielectric strength, making it ideal for electrical components.
- Thermal shock resistance: Boron nitride remains extremely stable under extreme and abrupt temperature changes.
- Excellent release and lubricating properties: It has a naturally very low coefficient of friction and provides reliable lubrication even under extreme conditions.
- Chemical resistance: It is chemically inert and can withstand even aggressive molten metals.
In addition, solid boron nitride can be machined extremely easily and to very tight tolerances without requiring any subsequent heat treatment (annealing). To provide the perfect solution for a wide range of applications, boron nitride is available not only as a solid component but also in the form of powders, liquid coatings, aerosol sprays, or as a lubricant additive.
