Back to results
US 9,168,664 B2Granted
Low stress hard coatings and applications thereof
AssigneeKennametal Inc.
InventorsVineet Kumar, Ronald Penich, Peter Leicht, Yixiong Liu
Life of this patent
Estimating the term…
Abstract
In one aspect, coated cutting tools are described herein. In some embodiments, a coated cutting tool comprises a substrate and a refractory layer deposited by PVD adhered to the substrate, the refractory layer comprising M1−xAlxN wherein x≧0.4 and M is titanium, chromium or zirconium, the refractory layer having a thickness greater than 5 μm, hardness of at least 25 GPa and residual compressive stress less than 2.5 GPa.
Claims42
A coated cutting tool comprising:
- a substrate;
- and
- a coating comprising a refractory layer deposited by physical vapor deposition adhered to the substrate, the refractory layer comprising M1−xAlxN wherein x≧0.55 and M is titanium, chromium or zirconium, the refractory layer having a thickness greater than 5 μm, hardness of at least 26 GPa and residual compressive stress less than 2.5 GPa.
A coated cutting tool comprising:
- a substrate;
- and
- a coating comprising a refractory layer deposited by physical vapor deposition adhered to the substrate, the refractory layer comprising a plurality of M1−xAlxN sublayers wherein x≧0.4 and M is titanium, chromium or zirconium, the refractory layer having a thickness greater than 5 μm, hardness of at least 25 GPa and residual compressive stress of less than 2.5 GPa.
A coated cutting tool comprising:
- a substrate;
- and
- a coating comprising a refractory layer deposited by physical vapor deposition adhered to the substrate, the refractory layer formed of a single continuous layer of M1−xAlxN wherein x≧0.4 and M is titanium, chromium or zirconium, the refractory layer having a thickness greater than 5 μm, hardness of at least 26 GPa and residual compressive stress less than 2.5 GPa.
Dependencies are inferred from the claim text.