High hardness/high compressive stress multilayer coated tool

Details High hardness/high compressive stress multilayer coated tool High hardness/high compressive stress multilayer coated tool

C - Chemistry, Metallurgy

23

C

117/157

C23C 28/04 (2006.01) B23B 27/14 (2006.01) B32B 18/00 (2006.01) C23C 14/06 (2006.01) C23C 30/00 (2006.01)

Patent

CA 1322496

K-0975 ABSTRACT OF THE DISCLOSURE A cutting tool is provided composed of a hard substrate having a PVD coating thereon having three layers. The innermost or first layer is composed of a group IVB (titanium, hafnium or zirconium) metal alloy. The middle or second layer is composed of a group IVB carbonitride. The outermost or third layer is also composed of a group IVB metal nitride. The PVD coating is characterized by high hardness and high residual compressive stresses.

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