Diamond- or Diamond-like carbon-coated hard materials

• US 5,391,422 A
• Filed: 01/07/1994
• Issued: 02/21/1995
• Est. Priority Date: 02/18/1991
• Status: Expired due to Fees

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Nomura, Toshio, Omori, Naoya
• Primary Examiner(s): Turner, A. A.
• Application Number:
  US08/178,622
• Time in Patent Office: 410 Days
• Field of Search: 428/408, 428/697, 428/446, 428/701, 428/212, 428/156, 428/172, 428/336
• US Class Current: 428/212
• CPC Class Codes: B23B 27/148 Composition of the cutting inserts
• CPC Class Codes: C04B 41/85 with inorganic materials
• CPC Class Codes: C23C 16/02 Pretreatment of the material to be coated C23C16/04 takes precedence
• CPC Class Codes: C23C 16/0227 by cleaning or etching
• CPC Class Codes: C23C 16/0272 Deposition of sub-layers, e.g. to promote the adhesion of the main coating
• CPC Class Codes: C23C 16/271 using hot filaments
• CPC Class Codes: C23C 16/274 using microwave discharges
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/30 Self-sustaining carbon mass or layer with impregnant or other layer

Abstract

A diamond-coated hard material having a diamond- or diamond-like carbon coated layer with a high bonding strength to a substrate is provided. The coated hard material comprising a diamond- and/or diamond-like carbon-coating layer formed on the surface of a hard material, i.e. substrate is characterized in that (I) (1) microscopic roughness is present on the surface of the substrate and (2) protrusive parts thereof are defined by the surface roughness Rmax within a range of 1.0 to 30 μm in a standard length when the standard length is 50 μm in the interface of the diamond- and/or diamond-like carbon coated layer and the substrate, and (II) (1) microscopic roughness is present on the surface of the substrate, (2) at least one protrusive part is present in a standard length when the standard length is 10 μm in the interface of the diamond- and/or diamond-like carbon coated layer and the substrate, (3) the ratio of sum A of the lengths of dent parts to sum B of the lengths of the protrusions is in the range of 0.05≦A/B≦20 in the standard length in the interface and (4) the protrusive parts are intruded into the diamond-coated layer.

Claims

1. A coated hard material comprising a diamond- and/or diamond-like carbon-coating layer formed on the surface of a hard material substrate, characterized in that (1) microscopic roughness is present on the surface of the substrate, (2) protrusive parts thereof having a height of at least 0.2 μ

m are defined by a surface roughness Rmax within a range of 1 to 30 μ

m in a standard length when the standard length is 50 μ

m in the interface bf the diamond- and/or diamond-like carbon-coated layer and the substrate, (3) at least one protrusive part having a height of at least 1 μ

m is present in a standard length when the standard length is 10 μ

m and the ratio of sum A of the lengths of dent parts to sum B of the lengths of the protrusions is in the range of 0.2 to 20, (4) the protrusive parts are intruded into the diamond-coated layer and (5) the material of the substrate is a cemented carbide or cermet.

2. A coated hard material comprising a diamond- and/or diamond-like carbon-coating layer formed on the surface of a hard material substrate, characterized in that (1) microscopic roughness is present on the surface of the substrate, (2) protrusive parts thereof having a height of at least 0.2 μ

m are defined by a surface roughness Rmax within a range of 1 to 30 μ

m in a standard length when the standard length is 50 μ

m in the interface of the diamond- and/or diamond-like carbon-coated layer and the substrate, (3) at least one protrusive part having a height of at least 1 μ

m is present in a standard length when the standard length is 10 μ

m and the ratio of sum A of the lengths of dent parts to sum B of the lengths of the protrusions is in the range of 0.05 to 20, (4) the protrusive parts are intruded into the diamond-coated layer and (5) the material of the substrate is a ceramic.