Coated article with nanolayered coating scheme

• US 20090155559A1
• Filed: 12/14/2007
• Published: 06/18/2009
• Est. Priority Date: 12/14/2007
• Status: Active Grant

• Current Assignee: Kennametal Incorporated, Oerlikon Surface Solutions Ag, PfAffikon (OC Oerlikon Corporation AG)
• Original Assignee: Kennametal Incorporated, Oerlikon Trading, Ltd.
• Inventors: Liu, Yixiong, Ni, Wangyang, Quinto, Dennis T., Derflinger, Volker-Hermann, Xu, Fengting, Bauer, Charles E., Ding, Qian, Penich, Ronald M.
• Granted Patent: US 7,947,363 B2
• Time in Patent Office: Days
• US Class Current: 428/216
• CPC Class Codes: C23C 14/0641 Nitrides C23C14/0617 takes precedence
• CPC Class Codes: C23C 14/0664 Carbonitrides
• CPC Class Codes: C23C 14/3464 using more than one target C23C14/56 takes precedence
• CPC Class Codes: C23C 28/042 including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides
• CPC Class Codes: C23C 28/044 coatings specially adapted for cutting tools or wear applications
• CPC Class Codes: C23C 28/048 with layers graded in composition or physical properties
• CPC Class Codes: C23C 28/42 characterized by the composition of the alternating layers
• CPC Class Codes: C23C 30/005 on hard metal substrates
• CPC Class Codes: Y10T 428/24975 No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/31678 Of metal

Abstract

A coated article that includes a substrate and a wear-resistant coating scheme. The coated article may be a cutting insert shown to improve performance in chip-forming material removal operations or a wear-resistant component used in chipless forming operations. The wear-resistant coating scheme has an underlayer and top layer containing aluminum, chromium, and nitrogen. The coating scheme also includes a mediate multi-periodicity nanolayer coating scheme containing titanium, aluminum, chromium and nitrogen. The mediate multi-periodicity nanolayer coating scheme includes a plurality of sets of alternating layer arrangements. Each one of the alternating layer arrangements has a base layer comprising titanium, aluminum and nitrogen and a nanolayer region having a plurality of sets of alternating nanolayers. Each set of alternating nanolayers has one nanolayer having aluminum, chromium, titanium and nitrogen and another nanolayer having aluminum, chromium, titanium and nitrogen. The base layer has a base layer thickness and the nanolayer region has a nanolayer region thickness. The base layer thickness is smaller than the nanolayer region thickness.

Claims

1. A coated cutting insert for use in a chipforming material removal operation, the cutting insert comprising:

a substrate and a wear-resistant coating scheme wherein the wear-resistant coating scheme comprising;

a mediate multi-periodicity nanolayer coating scheme containing titanium, aluminum, chromium and nitrogen; and

the mediate multi-periodicity nanolayer coating scheme comprising a plurality of sets of alternating layer arrangements wherein each one of the alternating layer arrangements comprises a base layer comprising titanium, aluminum and nitrogen and a nanolayer region comprising a plurality of sets of alternating nanolayers wherein each set of alternating nanolayers comprises one nanolayer comprising aluminum, chromium, titanium and nitrogen and another nanolayer comprising aluminum, chromium, titanium and nitrogen, and the base layer having a base layer thickness and the nanolayer region having a nanolayer region thickness wherein the base layer thickness is smaller than the nanolayer region thickness.

2. The coated cutting insert according to claim 1 wherein the base layer comprising (Ti_yAl₁₋

y)N wherein 0.2≦

y≦

0.65; and

the one nanolayer of the set of alternating nanolayers in the nanolayer region comprising (Ti_yCr_xAl<sub>1−

(x+y)</sub>)N wherein 0≦

x≦

0.15 and 0.2≦

y≦

0.65, and other nanolayer of the set of alternating nanolayers in the nanolayer region comprising (Ti_pAl_qCr<sub>1−

(p+q)</sub>)N wherein 0.2≦

p≦

0.65 and 0.01≦

q≦

0.65 and (p+q)<

1.

3. The coated cutting insert according to claim 1 wherein the wear-resistant coating scheme further including:

an underlayer containing aluminum, chromium and nitrogen;

a top layer containing aluminum, chromium and nitrogen, and wherein the underlayer being closer to the substrate than the top layer;

a lower transition coating region comprising a plurality of sets of alternating lower transition nanolayers wherein each set of alternating lower transition nanolayers comprises one lower transition nanolayer comprising aluminum, chromium, titanium and nitrogen and another lower transition nanolayer comprising aluminum, chromium, titanium and nitrogen, and the lower transition coating region providing a transition between the mediate multi-periodicity nanolayer coating scheme and the underlayer;

an upper transition coating region comprising a plurality of sets of alternating upper transition nanolayers wherein each set of alternating nanolayers comprises one upper transition nanolayer comprising aluminum, chromium, titanium and nitrogen and another upper transition nanolayer comprising aluminum, chromium, titanium and nitrogen, and the upper transition coating region providing a transition between the mediate multi-periodicity nanolayer coating scheme and the top layer; and

the mediate multi-periodicity nanolayer coating scheme being mediate of the lower transition coating region and the upper transition coating region.

4. The coated cutting insert according to claim 3 wherein the lower transition coating region having a lower transition thickness, the upper transition coating region having an upper transition thickness, and wherein the lower transition thickness being less than the nanolayer region thickness, and the upper transition thickness being less than the nanolayer region thickness.

5. The coated cutting insert according to claim 3 wherein the underlayer being of an underlayer thickness ranging between about 20 nanometers and about 500 nanometers, and the top layer being of a top layer thickness ranging between about 300 nanometers and about 2000 nanometers;

each set of the alternating layer arrangements being of a thickness ranging between about 200 nanometers and about 1400 nanometers; and

the sets of alternating nanolayers having a periodicity ranging between about 2 nanometers and about 50 nanometers.

6. The coated cutting insert according to claim 3 wherein:

the underlayer comprising (Al_aCr<sub>1−

a</sub>)N, and wherein 0.2≦

a≦

0.7;

the top layer comprising (Al_aCr<sub>1−

a</sub>)N, and wherein 0.2≦

a≦

0.7;

the one upper transition nanolayer comprising (Ti_yCr_xAl<sub>1−

(x+y)</sub>)N wherein 0<

x≦

0.15 and 0.2≦

y≦

0.65, and other upper transition nanolayer comprising (Ti_pAl_qCr<sub>1−

(p+q)</sub>)N wherein 0.2≦

p≦

0.5 and 0.01≦

q≦

0.65 and (p+q)<

1; and

the one lower transition nanolayer comprising (Ti_yCr_xAl<sub>1−

(x+y)</sub>)N wherein 0<

x≦

0.15 and 0.2≦

y≦

0.65, and other lower transition nanolayer comprising (Ti_pAl_qCr<sub>1−

(p+q)</sub>)N wherein 0.2≦

p≦

0.5 and 0.01≦

q≦

0.65 and (p+q)<

1.

7. The coated cutting insert according to claim 3 wherein the underlayer having an underlayer thermal conductivity and the base layer having a base layer thermal conductivity, and the underlayer thermal conductivity being less than the base layer thermal conductivity;

and the top layer having a top layer thermal conductivity, and the top layer thermal conductivity being less than the base layer thermal conductivity.

8. The coated cutting insert according to claim 3 wherein the underlayer, the top layer, the upper transition coating region, the lower transition coating region, and the mediate multi-periodicity nanolayer coating scheme each further comprising one or more of the metals from Group IVb, Vb and VIb of the Periodic Table and aluminum and silicon.

9. The coated cutting insert according to claim 3 wherein the underlayer, the top layer, the upper transition coating region, the lower transition coating region, and the mediate multi-periodicity nanolayer coating scheme each being applied by physical vapor deposition.

10. The coated cutting insert according to claim 1 wherein the mediate multi-periodicity nanolayer coating scheme further comprising carbon, and the base layer comprising (Ti_yAl₁₋

y)C_sN_t and wherein 0.2≦

y≦

0.65 and s+t=1, the one nanolayer of the set of alternating nanolayers in the nanolayer region comprising (Ti_yCr_xAl<sub>1−

(x+y)</sub>)C_sN_t wherein 0≦

x≦

0.15 and 0.2≦

y≦

0.65 and s+t=1, and the other nanolayer of the set of alternating nanolayers in the nanolayer region comprising (Ti_pAl_qCr<sub>1−

(p+q)</sub>)C_sN_t wherein 0.2≦

p≦

0.5 and 0.01≦

q≦

0.65 and (p+q)<

1 and s+t=1.

11. The coated cutting insert according to claim 1 wherein the wear-resistant coating scheme further including:

an underlayer comprising aluminum, chromium, nitrogen and carbon according to the formula (Al_aCr<sub>1−

a</sub>)C_sN_t, and wherein 0.2≦

a≦

0.7, and s+t=1;

a top layer comprising aluminum, chromium, nitrogen and carbon according to the formula (Al_aCr<sub>1−

a</sub>)C_sN_t and wherein 0.2≦

a≦

0.7, and s+t=1;

the underlayer being closer to the substrate than the top layer;

a lower transition coating region comprising a plurality of sets of alternating lower transition nanolayers wherein each set of alternating lower transition nanolayers comprises one lower transition nanolayer comprising aluminum, chromium, titanium, nitrogen and carbon and another lower transition nanolayer comprising aluminum, chromium, titanium, nitrogen and carbon, and the lower transition coating region providing a transition between the mediate multi-periodicity nanolayer coating scheme and the underlayer;

an upper transition coating region comprising a plurality of sets of alternating upper transition nanolayers wherein each set of alternating nanolayers comprises one upper transition nanolayer comprising aluminum, chromium, titanium, nitrogen and carbon and another upper transition nanolayer comprising aluminum, chromium, titanium, nitrogen and carbon, and the upper transition coating region providing a transition between the mediate multi-periodicity nanolayer coating scheme and the top layer; and

the mediate multi-periodicity nanolayer coating scheme being mediate of the lower transition coating region and the upper transition coating region.

12. The coated cutting insert according to claim 1 wherein the cutting insert having rake surfaces and flank surfaces, the rake surfaces intersecting the flank surfaces to form cutting edges at the intersection thereof.

13. The coated cutting insert according to claim 1 wherein the substrate comprising one of the following:

high speed steel, cemented carbides including cobalt-tungsten carbide, ceramics including SiAlON and alumina and silicon nitride, cermets including titanium carbide-based materials, and superhard materials including sintered cubic boron nitride and sintered diamond.

14. A coated cutting insert for use in a chipforming material removal operation, the cutting insert comprising:

a substrate and a wear-resistant coating scheme wherein the wear-resistant coating scheme comprising;

a mediate multi-periodicity nanolayer coating scheme containing titanium, aluminum, chromium and X;

the mediate multi-periodicity nanolayer coating scheme comprising a plurality of sets of alternating layer arrangements wherein each one of the alternating layer arrangements comprises a base layer comprising titanium, aluminum and X and a nanolayer region comprising a plurality of sets of alternating nanolayers wherein each set of alternating nanolayers comprises one nanolayer comprising aluminum, chromium, titanium and X and another nanolayer comprising aluminum, chromium, titanium and X;

wherein X comprising any one of the following nitrogen, carbon, boron, carbon and nitrogen, boron and nitrogen, carbon and boron and nitrogen, nitrogen and oxygen, carbon and oxygen, boron and oxygen, carbon and nitrogen and oxygen, boron and nitrogen and oxygen, and carbon and boron and nitrogen and oxygen; and

the base layer having a base layer thickness and the nanolayer region having a nanolayer region thickness wherein the base layer thickness is smaller than the nanolayer region thickness.

15. The coated cutting insert according to claim 14 wherein the wear-resistant coating scheme further including:

an underlayer containing aluminum, chromium and X;

a top layer containing aluminum, chromium and X, and wherein the underlayer being closer to the substrate than the top layer;

a lower transition coating region comprising a plurality of sets of alternating lower transition nanolayers wherein each set of alternating lower transition nanolayers comprises one lower transition nanolayer comprising aluminum, chromium, titanium and X and another lower transition nanolayer comprising aluminum, chromium, titanium and X, and the lower transition coating region providing a transition between the mediate multi-periodicity nanolayer coating scheme and the underlayer;

an upper transition coating region comprising a plurality of sets of alternating upper transition nanolayers wherein each set of alternating upper transition nanolayers comprises one upper transition nanolayer comprising aluminum, chromium, titanium and X and another upper transition nanolayer comprising aluminum, chromium, titanium and X, and the upper transition coating region providing a transition between the mediate multi-periodicity nanolayer coating scheme and the top layer; and

the mediate multi-periodicity nanolayer coating scheme being mediate of the lower transition coating region and the upper transition coating region.

17. A method of applying a coating scheme comprising the steps of:

applying a mediate multi-periodicity nanolayer coating scheme containing titanium, aluminum, chromium and X, and the step of applying the mediate multi-periodicity nanolayer coating scheme comprising the steps of;

applying a plurality of sets of alternating layer arrangements wherein application of each alternating layer arrangement comprising the steps of;

applying a base layer comprising titanium, aluminum and X; and

applying a nanolayer region comprising the steps of;

applying a plurality of sets of alternating nanolayers comprising the steps of;

applying one nanolayer comprising titanium, aluminum chromium, and X, and

applying another nanolayer comprising aluminum, chromium, titanium and X.

16. The coated cutting insert according to claim 18 wherein X comprises any one of the following:

nitrogen, carbon, boron, carbon and nitrogen, boron and nitrogen, carbon and boron and nitrogen, nitrogen and oxygen, carbon and oxygen, boron and oxygen, carbon and nitrogen and oxygen, boron and nitrogen and oxygen, and carbon and boron and nitrogen and oxygen.

18. The method of applying a coating scheme according to claim 17 further comprising the steps of:

providing a cutting insert substrate;

prior to applying the mediate multi-periodicity nanolayer coating scheme, applying, so as to be closest to the substrate, an underlayer containing aluminum, chromium and X;

the step of applying a mediate multi-periodicity nanolayer coating scheme further including applying the mediate multi-periodicity nanolayer coating scheme to the underlayer; and

applying a top layer to the mediate multi-periodicity nanolayer coating scheme wherein the top layer containing aluminum, chromium and X.

19. The method of applying a coating scheme according of claim 18 further including the steps of:

after applying the underlayer and prior to applying the mediate multi-periodicity nanolayer coating scheme, applying a lower transition layer comprising a plurality of sets of alternating lower transition nanolayers comprising the steps of;

applying a plurality of sets of alternating lower transition nanolayers comprising the steps of;

applying one lower transition nanolayer comprising titanium, aluminum chromium, and X, and

applying another lower transition nanolayer comprising aluminum, chromium, titanium and X;

after applying the mediate multi-periodicity nanolayer coating scheme, applying an upper transition layer comprising a plurality of sets of alternating upper transition nanolayers comprising the steps of;

applying a plurality of sets of alternating upper transition nanolayers comprising the steps of;

applying one upper transition nanolayer comprising titanium, aluminum chromium, and X, and

applying another upper transition nanolayer comprising aluminum, chromium, titanium and X.

20. The method of applying a coating scheme according to claim 20 wherein X comprises any one of the following:

nitrogen, carbon, boron, carbon and nitrogen, boron and nitrogen, carbon and boron and nitrogen, nitrogen and oxygen, carbon and oxygen, boron and oxygen, carbon and nitrogen and oxygen, boron and nitrogen and oxygen, and carbon and boron and nitrogen and oxygen.

21. A coated article comprising:

a substrate and a wear-resistant coating scheme wherein the wear-resistant coating scheme comprising;

a mediate multi-periodicity nanolayer coating scheme containing titanium, aluminum, chromium and nitrogen; and

the mediate multi-periodicity nanolayer coating scheme comprising a plurality of sets of alternating layer arrangements wherein each one of the alternating layer arrangements comprises a base layer comprising titanium, aluminum and nitrogen and a nanolayer region comprising a plurality of sets of alternating nanolayers wherein each set of alternating nanolayers comprises one nanolayer comprising aluminum, chromium, titanium and nitrogen and another nanolayer comprising aluminum, chromium, titanium and nitrogen, and the base layer having a base layer thickness and the nanolayer region having a nanolayer region thickness wherein the base layer thickness is smaller than the nanolayer region thickness.

22. The coated article according to claim 21 wherein the base layer comprising (Ti_yAl₁₋

y)N wherein 0.2≦

y≦

0.65; and

the one nanolayer of the set of alternating nanolayers in the nanolayer region comprising (Ti_yCr_xAl<sub>1−

(x+y)</sub>)N wherein 0<

x≦

0.15 and 0.2≦

y≦

0.65, and other nanolayer of the set of alternating nanolayers in the nanolayer region comprising (Ti_pAl_qCr<sub>1−

(p+q)</sub>)N wherein 0.2≦

p≦

0.65 and 0.01≦

q≦

0.65 and (p+q)<

1.

23. The coated article according to claim 21 wherein the substrate comprising one of the following:

high speed steel, cemented carbides including cobalt-tungsten carbide, ceramics including SiAlON and alumina and silicon nitride, cermets including titanium carbide-based materials, and superhard materials including sintered cubic boron nitride and sintered diamond.