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US 8,075,743 B2Granted
Oxide coated cutting insert
AssigneeSeco Tools AB
InventorsTommy Larsson, Mats Johansson
Life of this patent
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Abstract
A cutting tool insert, particularly useful for machining of cast iron, comprising a body of a hard alloy of cemented carbide, cermet, ceramics, cubic boron nitride based material or high speed steel a hard and wear resistant coating; and at least (Al,Cr)2O3 layer applied to said body is disclosed. Methods of making a cutting tool insert are also disclosed. In addition, methods for machining of cast iron using the cutting tool inserts are disclosed.
Claims4
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)2O3 layer;
- wherein said (Al,Cr)2O3 layer has a corundum phase crystalline structure and a composition (Al1-yCry)2O3 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)2O3 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, O2, 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.
4 more elements
Dependencies are inferred from the claim text.