Back to results
US 5,395,680 AGranted
Coated cutting tools
AssigneeKennametal Inc.
InventorsAnakkavur T. Santhanam, Rajendra V. Godse, Dennis T. Quinto, Kenneth E. Undercoffer, Prem C. Jindal
Life of this patent
Estimating the term…
Abstract
Provided is a coated cutting tool having a coating and a substrate. The coating includes at least one CVD layer which may have a residual tensile stress and at least one layer having a high residual compressive stress. The outermost layer of the coating is preferably the one containing residual compressive stresses. The substrate is a composite having hard refractory grains.
Claims12
An article of manufacture comprising:
- a CVD coated substrate;
- a PVD coating on said CVD coated substrate thereby providing said article of manufacture with a transverse rupture strength which is greater than the transverse rupture strength of said CVD coated substrate;
- and
- wherein said substrate is a composite having hard refractory grains.
1 more element
An article of manufacture comprising:
- a substrate having a first coating layer thereon;
- wherein said first coating is a CVD layer;
- a second coating layer applied on said first coating layer;
- wherein said second coating layer is in a state of residual compressive stress, thereby improving the transverse rupture strength of said coated substrate having said first coating layer thereon;
- wherein said substrate is a composite having hard refractory grains;
- and
- wherein said residual compressive stress exceeds 60 kg/mm.sup.2.
4 more elements
Dependencies are inferred from the claim text.