Boron Nitride – Solutions for Aluminum Extrusion
Christiane Klöpfer, ESK Ceramics GmbH & Co. KG, A Ceradyne Company, Kempten, Germany
Track: EXTRUSION/DIE, PRACTICAL - Extrusion Process
ABSTRACT --- Boron nitride is a synthetic material with outstanding release
and lubrication characteristics with respect to aluminum. BN is used for two
purposes: coating of the billet and/or the dummy block, and protection of the die.
For coating the billet and/or dummy block, BN has the following advantages
compared to standard solutions such as acetylene or grease: improved safety,
since there is no fire risk from a naked acetylene flame; no graphite or oil
contamination; no health risks as with acetylene, where the carbon black is
carcinogenic. The product quality of the extruded parts is enhanced, as there are
no black marks or blisters. BN powder coating is extremely efficient, because the
coating does not need to be applied with every pressing cycle, and its thickness is
only a few microns. BN-coated dies will not corrode during storage, and provide
a higher tonnage of products per die, due to reduced scrap at the beginning of the
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