Hard-coated body with a multi-layer system for tools and components such as drills, millers and indexable inserts, comprises a bonding layer applied on the body, a single- or multi-phase hard layer, and a phase gradient layer

摘要

The hard-coated body with a multi-layer system for tools and components such as drills, millers and indexable inserts, comprises a bonding layer applied on the body, a single- or multi-phase titanium aluminum nitride (Ti 1 - xAl xN) hard layer, and a phase gradient layer present between the bonding layer and the hard layer. The layer thickness of the phase gradient layer is 0.1-5 mu m. The atomic ratio of titanium and aluminum in the phase gradient layer is 1:1 to 1:15. The phase gradient layer has a constant or almost constant content of titanium, aluminum and nitrogen over its thickness. The hard-coated body with a multi-layer system for tools and components such as drills, millers and indexable inserts, comprises a bonding layer applied on the body, a single- or multi-phase titanium aluminum nitride (Ti 1 - xAl xN) hard layer, and a phase gradient layer present between the bonding layer and the hard layer. The layer thickness of the phase gradient layer is 0.1-5 mu m. The atomic ratio of titanium and aluminum in the phase gradient layer is 1:1 to 1:15. The phase gradient layer has a constant or almost constant content of titanium, aluminum and nitrogen over its thickness. The phase gradient layer comprises an increasing phase portion of face-centered cubic-titanium aluminum nitride (fcc-TiAlN) with a portion of greater than 50% in direction to the hard layer with increasing layer thickness, and a decreasing phase portion of titanium nitride (TiN) and hexagonal aluminum nitride (h-AlN). The multi-phase hard layer contains fcc-Ti 1 - xAl xN as main-phase. Titanium aluminum nitride (Ti 1 - xAl xN) is contained in wurtzite structure and/or titanium nitride as further phases. An independent claim is included for a method for producing hard-coated body.