| 摘要 |
<p>A cutting tool is provided composed of a hard substrate having a PVD coating thereon having three layers. The innermost of first layer (1) is composed of a group IVB (titanium, hafnium or zirconium) metal alloy. The middle or second layer (2 and 3) is composed of a group IVB carbonitride. The outermost or third layer (4) is also composed of a group IVB metal nitride. The PVD coating is characterized by high hardness and high residual compressive stresses.</p> |
