Fastening copper alloy

Patent metadata

Field	Value
Publication number	US-10760146-B2
Application number	US-201214419499-A
Country	US
Kind code	B2
Filing date	Aug 9, 2012
Priority date	Aug 9, 2012
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A copper alloy for fastening wherein the alloy has a structure of a mixture of α-phase and a β-phase; and wherein the alloy has a composition represented by the general formula: Cu bal. Zn a Mn b , where bal., a, and b are expressed in % by mass, bal. represents the balance, 34≤a≤40.5, 0.1≤b≤6, and inevitable impurities may be contained; and the composition satisfying the equation (1): b≥(−8a+300)/7, where 34≤a<37.5 and equation (2): b≤(−5.5a+225.25)/5, where 35.5≤a≤40.5.

First claim

The invention claimed is:

1. A slide fastener comprising at least one of a fastener element, a top end stop, a bottom end stop, and a slider, the slide fastener being made from a copper alloy wherein the alloy has a structure of a mixture of α-phase having a face centered cubic structure and a β-phase having a body centered cubic structure, wherein a β-phase percentage (%) in the structure is 22 or less as determined from observation of a cross section perpendicular to a rolled surface using an integrated peak intensity ration in X-ray diffraction, and wherein the alloy has a composition consisting of: Cu bal. Zn a Mn b and inevitable impurities, where bal., a, and b are expressed in % by mass, bal. represents the balance and is greater than 50, 35≤a≤38.3, 0.1≤b≤0.9; and the composition satisfying the following equations (3) and (4):
b≥−a+ 38.5, where 35≤ a≤ 38.3  (3),

b≤−a+ 40.5, where 37≤ a≤ 38.3  (4).

2. The copper alloy for a slide fastener according to claim 1 , wherein the β-phase percentage in the structure is greater than or equal to 0.1.

3. The copper alloy for a slide fastener according to claim 1 , wherein a mean crystal grain size in the structure is 3-14 μm.

4. The copper alloy for a slide fastener according to claim 2 , wherein a mean crystal grain size in the structure is 3-14 μm.

5. The copper alloy for a slide fastener according to claim 1 , wherein a pull-out strength after ammonia vapor test is 70% or more relative to that of Cu 85 Zn 15 material.

6. A component article for fastening formed of a copper alloy, wherein the copper alloy has a structure of a mixture of α-phase having a face centered cubic structure and a β-phase having a body centered cubic structure, wherein a β-phase percentage (%) in the structure is 22 or less as determined from observation of a cross section perpendicular to a rolled surface using an integrated peak intensity ration in X-ray diffraction, and wherein the alloy has a composition consisting of: Cu bal. Zn a Mn b and inevitable impurities, where bal., a, and b are expressed in % by mass, bal. represents the balance and is greater than 50, 35≤a≤38.3, 0.1≤b≤0.9; and the composition satisfies the following equations (3) and (4):
b≥−a+ 38.5, where 35≤ a≤ 38.3  (3),

b≤−a+ 40.5, where 37≤ a≤ 38.3  (4).

7. The copper alloy for a slide fastener according to claim 1 , wherein the alloy has a cold workability of 80% or more.

Assignees

• Kido Kouta
• Koizumi Takuya
• Yoshimura Yasuharu
• Fukuyama Takahiro
• Ogihara Atsushi
• Mikado Kouichi
• Kiyohara Jun
• Taira Yoshio
• Ykk Corp

Inventors

• Kido Kouta
• Koizumi Takuya
• Yoshimura Yasuharu
• Fukuyama Takahiro
• Ogihara Atsushi
• Mikado Kouichi
• Kiyohara Jun
• Taira Yoshio

Classifications

• A44B19/44

  Securing metal interlocking members to ready-made stringer tapes (making metal slide fastener parts combined with attaching B21D53/52) · CPC title

• A44B19/00

  Slide fasteners · CPC title

• C22F1/08

  of copper or alloys based thereon · CPC title

• C22C9/04 Primary

  with zinc as the next major constituent · CPC title

• A44B19/24

  Details · CPC title