Abstract

Boron nitride is an advanced ceramic material that shows outstanding lubricating and release properties when used at high temperature in contact with aluminum and its alloys. Today boron nitride is available in the form of paints for brushing and spraying. These coatings are proven release agents in the casthouse for coating thimbles, transition plates and refractory linings of distribution troughs of DC casting machines. During cast breaks they ensure an easy release of the remaining aluminum without damaging the refractory lining. In contrast to coatings used so far (based on graphite, silicates and similar substances) boron nitride release coatings are stable in air up to 1000°C (1832°F), show excellent non-wetting behavior (the best in the field of ceramics) and very good lubrication properties even at high temperatures. These advanced characteristics make boron nitride release coatings a first choice to engineers and metallurgists.

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© 2015 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst


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Use of Boron Nitride Coatings

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