The use of boron nitride in the coating industry is based on its lubricating properties, especially at high temperatures. The main applications are as follows: boron nitride coating and boron nitride release agent.

Boron nitride has a very low coefficient of friction, excellent self-lubricating properties, and good self-lubricating ability even at high temperatures. Soft lubricating component. The coating of boron nitride should be sprayed by gas-stabilized plasma spraying, supersonic flame spraying and explosive spraying technology. Hexagonal boron nitride is used as a soft component of high temperature sealing coatings for aero-engines, high temperature lubrication and antifriction coatings, electrical insulating coatings, neutron absorption coatings, etc., such as high frequency and plasma arc insulators, anti-neutron Radiation coatings, high temperature abradable coatings, etc.

Metals, as well as ceramics and graphite, can be coated with BN coatings, giving them good lubricity and anti-stick (mold release) properties. In addition, the chemical reaction between the substrate and the melt can be reduced or prevented after the coating has been applied, thereby extending its service life.

Boron nitride coatings can be used as mold release (release) agents for hot press forming of ceramics and glass forming, as well as coating of metal nozzle molds. BN-based coatings have good lubricating properties at high temperatures and are ideal release agents. Therefore, they can be used in superplastic forming processes (temperatures around 1000°C). Due to the high thermal stability of BN coatings, it is often used to replace the graphite and molybdenum disulfide used up to now. Since BN has very good non-wetting properties to the melt, BN coatings can be applied to the surface of crucibles and burning boats for protection. Taking advantage of the good high thermal conductivity of BN, coating the BN coating on the thermowell so that the thermocouple is immersed in the melt without being eroded is another application of the BN coating. BN coatings are usually suspended in a carrier liquid, usually water, and are often mixed with refractory binders. The BN content is generally between 10 and 30%.