Material with hard coating film formed on substrate surface thereof

• US 8,025,958 B2
• Filed: 06/30/2009
• Issued: 09/27/2011
• Est. Priority Date: 08/20/2008
• Status: Expired due to Fees

• Current Assignee: Klaus Schmidt
• Original Assignee: Kobe Steel Limited
• Inventors: Kujime, Susumu, Yamamoto, Kenji
• Primary Examiner(s): TURNER, ARCHENE A
• Application Number:
  US12/494,784
• Publication Number:
  US 20100047545A1
• Time in Patent Office: 819 Days
• Field of Search: 428/216, 428/336, 428/697, 428/698, 428/699
• US Class Current: 428/216
• CPC Class Codes: C23C 14/06 characterised by the coating material C23C14/0021 , C23C14/04 take precedence
• CPC Class Codes: C23C 14/0641 Nitrides C23C14/0617 takes precedence
• CPC Class Codes: C23C 14/0664 Carbonitrides
• CPC Class Codes: C23C 14/0676 Oxynitrides
• 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 28/42 characterized by the composition of the alternating layers
• 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

Abstract

A hard-coated material having a substrate coated with a wear resistant and easily removed film is provided. The film comprises laminated alternately in succession, a lower layer-A having a composition of formula Ti_vM_1-v(C_xN_yO_z) and an upper layer-B having a composition of formula Ti_vCr_wM_1-v-w(C_xN_yO_z). At least two lamination units are provided and the ratio in thickness of a singularity of the layer-B to a singularity of the layer-A is at least 2. The thickness of a singularity of the layer-A is within the range of 0.1 to 3μm both inclusive, the thickness of a singularity of the layer-B is within the range of 1 to 10μm both inclusive, and the total thickness of a plurality of the layers-B is at least 5 μm.

Claims

1. A hard-coated material, comprising:

a substrate; and

a hard-coating film on the substrate;

wherein the hard-coating film, comprises;

at least two lamination units in laminated structure formation,

wherein a lamination unit comprises, laminated alternately in succession;

a lower layer-A; and

an upper layer-B;

wherein

a first lower layer A is on the substrate, and

each layer-A has a component composition of formula;

Ti_vM_1-v(C_xN_yO_z),

wherein

M is at least one specie selected from the group consisting of Group-4 elements, Group-5 elements, Group-6 elements, Si, Al, B, and Y, excluding Ti;

0.6≦

v≦

1

0≦

z≦

0.1

x+y+z=1;

each layer-B has a component composition of formula;

Ti_vCr_wM_1-v-w(C_xN_yO_z),

wherein M is at least one specie selected from the group consisting of Group-4 elements, Group-5 elements, Group-6 elements, Si, Al, B, and Y, excluding Ti and Cr;

0≦

v≦

0.6

0.05<

w

v+w≦

1

0≦

x≦

0.5

0≦

z≦

0.1

x+y+z=1;

wherein a thickness ratio of a layer-B to a layer-A is at least 2; and

a thickness of a layer-A is within the range of 0.1 to 3 μ

m both inclusive,

a thickness of layer-B is within the range of 1 to 10 μ

m both inclusive, and

a total thickness of a plurality of layers-B is at least 5 μ

m.

2. The hard-coated material according to claim 1, wherein

each layer-A has a component composition of formula:

TiN; and

each layer-B has a component composition of formula;

(Ti_aCr_bAl_cSi_dB_e)(C_xN_y),

wherein

0.05≦

a≦

0.3

0.1≦

b≦

0.4

0.4≦

c≦

0.75

0≦

d≦

0.15

0≦

e≦

0.1

a+b+c+d+e=1

0.5≦

y≦

1

x+y=1.

3. The hard-coated material according to claim 1, wherein

each layer-A has a component composition of formula:

TiN; and

each layer-B has a component composition of formula;

(Nb_fCr_gAl_hSi_iB_j)(C_xN_y)

wherein

0.05≦

f ≦

0.3

0.1≦

g ≦

0.4

0.4≦

h ≦

0.7

0≦

i ≦

0.15

0≦

j ≦

0.1

f+g+h+i+j=1

0.5≦

y≦

1

x+y=1.

4. The hard-coated material to claim 1, further comprising:

a protective CrN film having a thickness of at least 0.5μ

m between the substrate and the hard-coating film.

5. The hard-coated material to claim 2, further comprising:

a protective CrN film having a thickness of at least 0.5μ

m between the substrate and the hard-coating film.

6. The hard-coated material to claim 3, further comprising;

a protective CrN film having a thickness of at least 0.5μ

m between the substrate and the hard-coating film.