Oxidation Stability, Chemical Resistance

Boron Nitride is oxidation-resistant and, to a large extent, chemically inert.

Boron Nitride can be used in air up to approx. 900°C. Maximum temperature of use under Nitrogen or Argon as well as in a reducing atmosphere (H₂, CO) exceeds 2.500°C.

Owing to its stability against Carbon and Carbon monoxide at high temperatures, Boron Nitride is used as a sintering aid and as a refractory material. In these applications Boron Nitride is clearly superior to other nitrides (Silicon Nitride, Aluminium Nitride) as well as to oxide ceramics (Magnesia, Calcium Oxide, Zirconia).

In addition, Boron Nitride is used to prevent contamination and carburisation commonly caused by graphite at high temperatures.

There are only very few substances such as molten alkalis and alkaline solutions that will attack or dissolve Boron Nitride at high temperatures.