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US 8,075,744 B1Granted
Layered coated cutting tool
AssigneeSeco Tools AB
InventorsMats Johansson, Jon Andersson, Jacob Sjolen
Life of this patent
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Abstract
A cutting tool insert is formed from a substrate selected from cemented carbide, cermet, ceramics, cubic boron nitride based material or high speed steel. The insert includes a hard and wear-resistant coating formed from laminar polycrystalline metal nitrides layers. The laminar polycrystalline metal nitrides layers have a repetitive form . . . A/B/A/C/A/B/A/C/ . . . with a total thickness of about 0.5 μm to about 5 μm.
Claims20
A method of making a cutting tool insert comprising:
- a substrate 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 comprising laminar polycrystalline metal nitrides layers;
- said laminar polycrystalline metal nitrides layers having a repetitive form . . . A/B/A/C/A/B/A/C/ . . . with a total thickness of about 0.5 μm to about 5 μm;
- wherein layer A is a cubic structured MeN, and Me is one or more of metal elements selected from the group consisting of Ti, Nb, Hf, V, Ta, Zr, Cr, and Al;
- wherein layer B is a cubic structured (Ti,Al)N;
- and wherein layer C is a cubic structured (Ti,Si)N;
- wherein the average composition of said coating is about 46 atomic share (at-%)<Zr+Hf+V+Cr+Nb+Ta+Ti+Al+Si<about 54 at-% and balance N;
- wherein an average thickness of each of said layer A (dA) is about 2 nm<dA<about 100 nm;
- wherein an average thickness of each of said layer B (dB) is about 4 nm<dB<about 150 nm;
- and
- wherein an average thickness of each of said layer C (dC) is about 4 nm<dC<about 150 nm;
- and
- wherein said average thickness of each of said layer A, said layer B, and layer C is substantially constant throughout said coating;
- said method comprising the steps of:
- growing each of said layers into said repetitive form . . . A/B/A/C/A/B/A/C/ . . . by cathodic are evaporation to a total coating thickness of 0.5 to 5 μm with an evaporation current between about 50 A and about 200 A, in an atmosphere comprising a gas selected from the group consisting of Ar, N2, and combinations thereof, at a total pressure between about 0.5 Pa and about 7.0 Pa, with a substrate bias between about −10 V and about −80 V, at a temperature between about 350° C. and about 700° C.;
- wherein said layer A is grown using a pure or alloyed Me cathode;
- wherein said layer B is grown using a Ti+Al-cathode with a composition between about (70 at-% Ti+30 at-% Al) and about (5 at % Ti+95 at-% Al);
- and
- wherein said layer C is grown using a Ti+Si-cathode with a composition between about (95 at % Ti+5 at % Si) and about (75 at % Ti+25 at % Si).
17 more elements
A method for machining of stainless steel and super alloys, comprising:
- machining with a cutting tool insert at a cutting speed of about 50-400 m/min, with an average feed, per tooth in the case of milling, of about 0.08-0.5 mm,
- wherein the cutting tool insert comprises:
- a substrate 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 comprising laminar polycrystalline metal nitrides layers;
- wherein said laminar polycrystalline metal nitrides layers have a repetitive form . . . A/B/A/C/A/B/A/C/ . . . with a total thickness of about 0.5 μm to about 5 μm;
- wherein layer A is a cubic structured MeN, and Me is one or more of the metal elements selected from the group consisting of Ti, Nb, Hf, V, Ta, Zr, Cr, and Al;
- wherein layer B is a cubic structured (Ti,Al)N;
- and
- wherein layer C is a cubic structured (Ti,Si)N;
- wherein the average composition of said laminar polycrystalline metal nitride layers is about 46 atomic share (at-%)<Zr+Hf+V+Cr+Nb+Ta+Ti+Al+Si<about 54 at-% and balance N;
- wherein an average thickness of each of said layer A (dA) is about 2 nm<dA<about 100 nm;
- wherein an average thickness of each of said layer B (dB) is about 4 nm<dB<about 150 nm;
- and
- wherein an average thickness of each of said layer C (dC) is about 4 nm<dC<about 150 nm;
- and
- wherein said average thickness of each of said layer A, said layer B, and layer C is substantially constant throughout said coating.
14 more elements
A method for machining of stainless steel and super alloys, comprising:
- machining with a cutting tool insert at a cutting speed of about 75-300 m/min, with an average feed, per tooth in the case of milling, of about 0.1-0.4 mm,
- wherein the cutting tool insert comprises:
- a substrate 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 comprising laminar polycrystalline metal nitrides layers;
- wherein said laminar polycrystalline metal nitrides layers have a repetitive form . . . A/B/A/C/A/B/A/C/ . . . with a total thickness of about 0.5μm to about 5 μm;
- wherein layer A is a cubic structured MeN, and Me is one or more of the metal elements selected from the group consisting of Ti, Nb, Hf, V, Ta, Zr, Cr, and Al;
- wherein layer B is a cubic structured (Ti,Al)N;
- and
- wherein layer C is a cubic structured (Ti,Si)N;
- wherein the average composition of said laminar polycrystalline metal nitride layers is about 46 atomic share (at-%)<Zr+Hf+V+Cr+Nb+Ta+Ti+Al+Si<about 54 at-% and balance N;
- wherein an average thickness of each of said layer A (dA) is about 2 nm<dA<about 100 nm;
- wherein an average thickness of each of said layer B (dB) is about 4 nm<dB<about 150 nm;
- and
- wherein an average thickness of each of said layer C (dC) is about 4 nm<dC<about 150 nm;
- and
- wherein said average thickness of each of said layer A, said layer B, and layer C is substantially constant throughout said coating.
14 more elements
Dependencies are inferred from the claim text.