Patents Assigned to Balzers Limited
  • High hardness/high compressive stress multilayer coated tool
    Patent number: 5075181
    Abstract: 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 nitride. 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.
    Type: Grant
    Filed: May 5, 1989
    Date of Patent: December 24, 1991
    Assignees: Kennametal Inc., Balzers Limited
    Inventors: Dennis T. Quinto, Helmut J. Kaufmann