Use of Boron Nitride Coatings with Aluminum Casting Technology
Frank Reusch, Drache Umwelttechnik GmbH and
Stephan Rudolph, Büro für angewandte Mineralogie
Track: BILLET PROCESS AND EQUIPMENT - Billet Processing
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
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