Hexagonal boron nitride has excellent chemical stability and can resist the neutron radiation of nuclear reactors. It is not affected by acid and alkali. In an inert atmosphere (nitrogen or argon), the decomposition temperature is as high as 2500 ° C. It shows excellent performance under extreme conditions. Excellent chemical stability.

Hexagonal boron nitride can be made into boron nitride separation rings (Figure 3) for horizontal continuous casting of steel. Hexagonal boron nitride is very stable to carbon and carbon monoxide at 1800 ° C, and is not corroded by molten glass, silicon, boron, non-oxide slag, molten salt (borax, cryolite) in steel.

Hexagonal boron nitride can be made into a composite shell for titanium metal casting. The chemical stability of titanium metal is poor. When the forging is violently deformed at high temperature, the fresh surface produced by the metal flow is very easy to stick to the die, causing the forging and the die to be scrapped at the same time. The composite shell layer of boron nitride release agent is coated on the surface of the mold to avoid direct contact between the titanium metal and the mold.

Hexagonal boron nitride can also be used in welding and furnace brazing processes, which can protect the workpiece surface from being damaged by spatter of welding slag, and can also play a protective role in the metal welding process.