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The literature tells us that hexagonal
boron nitride (BN) shows a poor wettability by metallic melts (Al, Mg),
slags, and nonmetallic melts such as glass and cryolith. At the same time,
it represents a solid lubricant that - as opposed to graphite and molybdenum
disulphide - is thermally stable even at high temperatures. Thus, boron
nitride is an excellent refractory basic material for high-temperature
parting materials and lubricants.
With Boron-Nitride-Coating Grade A
from the Büro für angewandte Mineralogie (Tönisvorst,
Germany), a hexagonal boron nitride-based coating and separating agent
is available in the form of a suspension with which metallic and ceramic
substrates can be coated. It is stable up to 1000°C in air, applicable
up to 1800°C in an inert atmosphere, and can be applied like a glaze
with a brush or a spray gun.
Areas of application for this product
are found in the laboratory as well as in production. The product is produced
on a water basis and is thus not harmful to the environment. It also contains
no organic components such as fats or oils which means no products are
released when the temperature is raised. It is not considered hazardous
and, in accordance with the hazardous materials ordinance, does not have
to be labeled as such. |
