Coated cutting tool and a method for coating the cutting tool
AssigneeSeco Tools AB
InventorsMikael Fallqvist, Jon Andersson
Life of this patent
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Abstract
A coated cutting tool includes a substrate with a coating having a total thickness of 0.25-30 μm. The coating has a first layer and a second layer, the first layer being a wear resistant PVD deposited layer having a thickness of 0.2-15 μm arranged between the substrate and the second layer, and wherein the second layer is a Cr layer.
Claims19
A coated cutting tool comprising a substrate with a coating having a total thickness of 0.25-30 μm, wherein the coating includes a first layer and a second layer, and wherein the first layer is a wear resistant PVD deposited layer having a thickness of 0.2-15 μm, the first layer being arranged between the substrate and the second layer, the first layer being
- a (Ti1−xAlx)Ny layer with 0.1<x<0.7 and 0.6<y<1.1, or
- a NaCl structured (Ti1−yAly)Nw/(Ti1−aSia)Nb nanolaminate with sublayer thickness between 5 and 50 nm, where 0.1<v<0.7, 0.7<w<1.1, 0.02<a<0.25, and 0.7<b<1.1, or
- a (Ti1−mSim)Nn layer, where 0≤m<0.25, and 0.7<n<1.1, or
- a (Cr1−cAlc)Nd layer, where 0.5<c<0.9, and 0.7<d<1.1, or
- a (Cr1−eAle)2O3 layer, where 0.5<e<0.9, and wherein the second layer is a Cr layer, the Cr layer being an outermost layer of the coating.
A method for producing of a coated cutting tool comprising the steps of:
- applying a substrate of cemented carbide, cermet, ceramic, steel or cubic boron nitride with a hard and wear resistant coating having a thickness of 0.25-30 μm by means of PVD (physical vapor deposition) techniques, such as cathodic arc deposition, wherein the coating includes a first layer, the first layer being
- a (Ti1−xAlx)Ny layer with 0.1<x<0.7 and 0.6<y<1.1, or
- a NaCl structured (Ti1−yAlv)Nw/(Ti1−aSia)Nb nanolaminate with sublayer thickness between 5 and 50 nm, where 0.1<v<0.7, 0.7<w<1.1, 0.02<a<0.25, and 0.7<b<1.1, or
- a (Ti1−mSim)Nn layer, where 0≤m<0.25, and 0.7<n<1.1, or
- a (Cr1−cAlc)Nd layer, where 0.5<c<0.9, and 0.7<d<1.1, or
- a (Cr1−eAle)2O3 layer, where 0.5<e<0.9
- and a second layer, the second layer being a Cr layer arranged as an outermost layer of the coating;
- and
- growing the Cr layer by using pure Cr cathodes applying an evaporation current between 50 A and 200 A, a gas atmosphere containing pure Ar at a total gas pressure between 1.0 Pa and 7.0 Pa, and applying a deposition temperature between room temperature and 500° C.
A coated cutting tool comprising a substrate with a coating having a total thickness of 0.25-30 μm, wherein the coating includes a first layer and a second layer, and wherein the first layer is a wear resistant PVD deposited layer having a thickness of 0.2-15 μm, the first layer being arranged between the substrate and the second layer, and wherein the second layer is a Cr layer, the Cr layer being an outermost layer of the coating, wherein the Cr layer has a body-centered cubic structure with a crystallographic orientation relation of 0.3<R1<1, where R1=I(110)/(I(110)+I(200)+I(211)), and where I(110), 1(200), and 1(211) are the XRD peak areas as extracted from the pseudo-Voigt peak profile fitting results of θ-2θ scans obtained with CuKα radiation for the bcc structure Cr layer diffraction peaks.
Dependencies are inferred from the claim text.