# US 7,611,591 B2 · Structure and method of manufacturing the same

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- Number: US 7,611,591 B2
- Document ID: US7611591B2
- Status: Granted
- Kind: B2
- Application number: 10/586,923
- Filed: 2005-09-26
- Published: 2007-07-12
- Granted: 2009-11-03
- Earliest claimed: 2004-11-24
- Assignees: Sumitomo Electric Industries, Ltd.
- Inventors: Koji Nitta; Kenji Miyazaki; Shinji Inazawa
- Web page: https://patentgrep.com/patent/US7611591B2

## CPC

- C25D 1/00: Electroforming
- B81C 1/0065: {Mechanical properties}
- C25D 3/66: from melts
- Y10T 428/12493: Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T 428/12576: Boride, carbide or nitride component
- Y10T 428/12806: Refractory [Group IVB, VB, or VIB] metal-base component
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- B81C: PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS (making microcapsules or microballoons B01J13/02; processes or apparatus specially adapted for the manufacture or treatment of piezoelectric, electrostrictive or magnetostrictive elements per se H10N30/01)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A structure which comprises tungsten as the main component and contains tungsten carbide, wherein the content of carbon is 0.1 mass % or higher based on the structure and the total content of cobalt, nickel, and iron is 3 mass % or lower based on the structure.

## Claims

### Claim 1

A structure comprising tungsten as a main component and tungsten carbide, wherein content of the tungsten is at least 50% by mass, content of carbon in the structure is at least 0.1% by mass and total content of cobalt, nickel, and iron is 3% or less by mass, respectively based on the structure,
wherein the structure has pools having a size of at least 5 μm and consisting of at least one element selected from the group consisting of cobalt, nickel, and iron, and the number of pools is not more than one per 100 mm2 of the surface of the structure.

### Claim 2 (depends on 1)

The structure according to claim 1, wherein the structure has a shape comprising at least one of a concave portion and a convex portion, width D of the shape being 1 μm to 100 μm and height of the shape being 1 μm to 1000 μm.