Multilayer coated cemented carbide cutting insert

Details Multilayer coated cemented carbide cutting insert Multilayer coated cemented carbide cutting insert

B - Operations, Transporting

23

B

57/17

B23B 27/14 (2006.01) C23C 30/00 (2006.01)

Patent

CA 1327277

ABSTRACT OF THE INVENTION An indexable metalcutting insert is provided having a cobalt cemented tungsten carbide substrate with a multilayer refractory coating thereon. The substrate has a cobalt content of 6.1 to 6.5 weight percent and is characterized by a hardness of 90.8 to 91.6 Rockwell A and a magnetic coercive force of 110 to 180 oerstads. The coating contains at least a plurality of alumina layers which are separated from and bonded to each other by a group IVB metal nitride, such as titanium nitride, and which are bonded to the substrate by a backing layer of 5 to 8 µ in thickness, composed of a carbide and/or carbonitride of titanium, zirconium and/or hafnium.

612218

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