Metal wire, saw wire, cutting apparatus, and method of manufacturing metal wire

Patent metadata

Field	Value
Publication number	US-10967447-B2
Application number	US-201916256636-A
Country	US
Kind code	B2
Filing date	Jan 24, 2019
Priority date	Jan 29, 2018
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A metal wire containing tungsten is provided. A tungsten content of the metal wire is at least 90 wt %. A tensile strength of the metal wire is at least 4000 MPa. An elastic modulus of the metal wire is at least 350 GPa and at most 450 GPa. A diameter of the metal wire is at most 60 μm. An average crystal grain size of the metal wire in a cross-section orthogonal to an axis of the metal wire is at most 0.20 μm.

First claim

What is claimed is:

1. A metal wire containing tungsten, wherein
a tungsten content of the metal wire is at least 90 wt %,
a tensile strength of the metal wire is at least 4000 MPa,
an elastic modulus of the metal wire is at least 350 GPa and at most 450 GPa,
a diameter of the metal wire is at most 60 μm, and
an average crystal grain size of the metal wire in a cross-section orthogonal to an axis of the metal wire is at most 0.20 μm.

2. The metal wire according to claim 1 , wherein
the tensile strength of the metal wire is at least 4500 MPa.

3. The metal wire according to claim 1 , wherein
the tensile strength of the metal wire is greater than 5000 MPa.

4. The metal wire according to claim 1 , wherein
the average crystal grain size is at most 0.16 μm.

5. The metal wire according to claim 1 , wherein
the metal wire contains a rhenium-tungsten alloy, and
a rhenium content of the metal wire is at least 0.1 wt % and at most 10 wt %.

6. The metal wire according to claim 1 , wherein
the metal wire contains the tungsten doped with potassium, and
a potassium content of the metal wire is at most 0.01 wt %.

7. The metal wire according to claim 6 , wherein
the potassium content of the metal wire is at least 0.005 wt %.

8. A metal wire containing tungsten, wherein
a tungsten content of the metal wire is at least 90 wt %,
a diameter of the metal wire is at most 60 μm, and
an average crystal grain size of the metal wire in a cross-section orthogonal to an axis of the metal wire is at most 0.20 μm.

9. A saw wire, comprising the metal wire according to claim 1 .

10. A cutting apparatus, comprising the saw wire according to claim 9 .

11. A method of manufacturing a metal wire containing tungsten, the method comprising:
forming the metal wire, wherein
a tungsten content of the metal wire is at least 90 wt %,
a tensile strength of the metal wire is at least 4000 MPa,
an elastic modulus of the metal wire is at least 350 GPa and at most 450 GPa,
a diameter of the metal wire is at most 60 μm, and
an average crystal grain size of the metal wire in a cross-section orthogonal to an axis of the metal wire is at most 0.20 μm.

12. The method according to claim 11 , wherein
the forming includes repeatedly performing a plurality of processes in sequence, and
the plurality of processes includes a wire drawing process, a polishing process, and a die exchange process.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kanazawa Tomohiro
• Kohyama Naoki
• Iguchi Yoshihiro
• Sasagawa Yuuki
• Shibata Tetsuji
• Tani Toshiyuki

Classifications

• B23D57/0023

  with a plurality of saw wires or saw wires having plural cutting zones · CPC title

• B23D61/18

  Sawing tools of special type, e.g. wire saw strands, saw blades or saw wire equipped with diamonds or other abrasive particles in selected individual positions {(cut-off wheels of bonded abrasive or with inserted abrasive blocks B24D5/12)} · CPC title

• B23D65/00

  Making tools for sawing machines or sawing devices for use in cutting any kind of material · CPC title

• B24B27/0633 Primary

  using a cutting wire · CPC title

• C25D15/02

  Combined electrolytic and electrophoretic processes {with charged materials} · CPC title