Patent ID: 8075743

Claim:
A method of making a cutting tool insert comprising: a body comprising a hard alloy selected from the group consisting of cemented carbide, cermet, ceramics, cubic boron nitride based material, and high speed steel; and a hard and wear resistant coating applied on said body; wherein said coating comprises at least one (Al,Cr) 2 O 3 layer; wherein said (Al,Cr) 2 O 3 layer has a corundum phase crystalline structure and a composition (Al 1-y Cr y ) 2 O 3 with about 0.4≦y≦about 0.6, with a thickness of about 0.5 μm to about 10 μm and a fiber texture, rotational symmetry, in the direction of the coated surface normal with an inclination angle, φ, of the basal planes relative to the coated surface normal is 40°<φ<70° or the inclination angle, φ, for the highest peak in the pole plot is 40°<φ<70′; said method comprising the step of: depositing on said body said (Al,Cr) 2 O 3 layer by cathodic arc evaporation using Al+Cr-cathodes with a composition of about (40 at % Al+60 at % Cr) and about (60 at % Al+40 at % Cr), an evaporation current between about 50 A and about 200 A depending on the cathode size in an atmosphere comprising a gas selected from the group consisting of Ar, O 2 , and combinations thereof, at a total pressure of about 1.0 Pa to about 5.0 Pa, a bias of about −50 V to about −200 V, and a deposition temperature of about 400° C. and about 600° C.