Hard layer-coated tool

• US 6,790,543 B2
• Filed: 11/07/2002
• Issued: 09/14/2004
• Est. Priority Date: 11/07/2001
• Status: Expired due to Term

• Current Assignee: Hitachi Tool Engineering, Ltd. (Mitsubishi Materials Corporation)
• Original Assignee: Hitachi Tool Engineering, Ltd. (Mitsubishi Materials Corporation)
• Inventors: Shima, Nobuhiko, Kubota, Kazuyuki
• Primary Examiner(s): TURNER, ARCHENE A
• Application Number:
  US10/289,388
• Publication Number:
  US 20030148146A1
• Time in Patent Office: 677 Days
• Field of Search: 428/704, 428/701, 428/702, 428/698, 428/697, 428/699, 428/336, 513/07, 513/09
• US Class Current: 428/698
• CPC Class Codes: C23C 14/0688 Cermets, e.g. mixtures of metal and one or more of carbides, nitrides, oxides or borides
• 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 428/265 1 mil or less

Abstract

A tool coated with a hard Ti/B layer having fine boron nitride particles dispersed therein, wherein the bonding energy of B and N is observed in an ESCA analysis of the hard coating layer; wherein peaks of c-BN and h-BN is detected in an Raman spectroscopy of the hard coating layer; wherein a ratio Q₁/Q₂ of a peak intensity Q₁ of c-BN to a peak intensity Q₂ of h-BN is 1.0 or more; wherein a half-value width Z of a (200) face in an X-ray diffraction of the hard coating layer is in a range of 0.3° to 0.6°; and wherein a ratio K/L of a face thickness K to a flank thickness L in the tool is 1.0 or more, whereby the hard coating layer has high hardness, high lubricating properties and excellent crater wear resistance, with chemical reactions with a work suppressed.

Claims

1. A tool coated with a hard layer made of any of a nitride, a carbonitride, an oxynitride and an oxycarbonitride each of which contains Ti and B as metal elements;

wherein said hard coating layer contains a boron nitride phase;

wherein the bonding energy of B and N is observed in an ESCA analysis of said hard coating layer; and

wherein the existence of c-BN and h-BN is observed in a Rarnan spectroscopy of said hard coating layer.

2. The hard layer-coated tool according to claim 1, wherein a half-value width Z of a (200) face in an X-ray diffraction of said hard coating layer is in a range of 0.3°

to 0.6°

;

wherein peaks of c-BN and h-BN are detected in an Raman spectroscopy of said hard coating layer;

wherein a ratio Q₁/Q₂ of a peak intensity Q₁ of c-BN to a peak intensity Q₂ of h-BN is 1.0 or more; and

wherein a ratio K/L of a face thickness K to a flank thickness L in said tool is 1.0 or more.

3. The hard layer-coated tool according to claim 1, wherein said hard coating layer is formed by using a target of a Ti-B alloy;

and wherein the content of B in said hard coating layer is 0.1 to 50 atomic %, based on the total amount (100 atomic %) of metal elements.

4. The hard layer-coated tool according to claim 1, further comprising, as a layer other than said hard coating layer, a second hard coating layer either on said hard coating layer or on a surface of an insert substrate comprising at least one metal element selected from the group consisting of Ti, Al and Cr, and at least one non-metal element selected from the group consisting of C, O and N.

5. The hard layer-coated tool according to claim 4, wherein part of said metal element in the second hard coating layer containing Ti, Al and Cr is substituted, as a metal element other than said metal element, by at least one selected from the group consisting of metals in the Groups 4a, 5a and 6a and Si.

6. The hard layer-coated tool according to claim 1, wherein a tool substrate is made of cemented carbide or cermet;

and wherein the total thickness of said hard coating layer is 3 to 15 μ

m in a tool face.

7. The hard layer-coated tool according to claim 1, wherein said tool is an insert.

8. The hard layer-coated tool according to claim 2, wherein said hard coating layer is formed by using a target of a Ti-B alloy;

and wherein the content of B in said hard coating layer is 0.1 to 50 atomic %, based on the total amount (100 atomic %) of metal elements.