US2003091461A1PendingUtilityA1

Nickel-free white copper alloy, and method of producing nickel-free white copper alloy

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Assignee: YKK CORPPriority: Oct 26, 2001Filed: Oct 24, 2002Published: May 15, 2003
Est. expiryOct 26, 2021(expired)· nominal 20-yr term from priority
Inventors:Yasuharu YoshimuraKazuhiko KitaTakuya Koizumi
C22C 9/04C22F 1/08
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PatentIndex Score
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Claims

Abstract

An Ni-free white copper alloy of formula Cu a Zn b Ti c or Cu a Zn b Ti c X d wherein X is at least one element selected from the group consisting of Al, Sn, Ag and Mn, b, c and d are, in mass %, 0.5≦b≦30, 1≦c≦7 and 0.1≦d≦4, and a is the balance, with unavoidable elements, and also a producing method therefor, comprising: preparing a material alloy for the above white copper alloy; heating the alloy to 700 to 885° C.; and cooling the alloy. The Ni-free white copper alloy has a strength and excellent hardness comparable to those of nickel silver, as well as excellent workability, corrosion resistance and whiteness in addition to ductility, and is free from an Ni allergy problem because of containing no nickel, and moreover tends not to cause needle detectors to malfunction.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A nickel-free white copper alloy represented by the general formula Cu a Zn b Ti c  wherein b and c are, in mass %, 0.5≦b≦30 and 1≦c<7, and a is the balance, with other unavoidable elements also possibly being contained.  
     
     
         2 . A nickel-free white copper alloy represented by the general formula Cu a Zn b Ti c X d  wherein X is at least one element selected from the group consisting of Al, Sn, Ag and Mn, b, c and d are, in mass %, 0.5≦b≦30, 1≦c<7 and 0.1<d<4, and a is the balance, with other unavoidable elements also possibly being contained.  
     
     
         3 . The nickel-free white copper alloy according to  claim 1 , being composed of a single α-phase at room temperature.  
     
     
         4 . The nickel-free white copper alloy according to  claim 2 , being composed of a single α-phase at room temperature.  
     
     
         5 . The nickel-free white copper alloy according to  claim 1 , having a magnetization of 80 memu/g or less in a magnetic field of 18 kOe.  
     
     
         6 . The nickel-free white copper alloy according to  claim 2 , having a magnetization of 80 memu/g or less in a magnetic field of 18 kOe.  
     
     
         7 . The nickel-free white copper alloy according to  claim 1 , having a conductivity of 20% IACS or less.  
     
     
         8 . The nickel-free white copper alloy according to  claim 2 , having a conductivity of 20% IACS or less.  
     
     
         9 . The nickel-free white copper alloy according to  claim 1 , wherein the b and c are, in mass %, 2≦b≦13 and 3≦c≦6.  
     
     
         10 . The nickel-free white copper alloy according to  claim 2 , wherein the b and c are, in mass %, 2≦b≦13 and 3≦c≦6.  
     
     
         11 . A method of producing a nickel-free white copper alloy, comprising: preparing an alloy represented by the general formula Cu a Zn b Ti c  wherein b and c are, in mass %, 0.5≦b≦30 and 1≦c<7, and a is the balance, with other unavoidable elements also possibly being contained; heating the alloy to 700 to 885° C.; and cooling the alloy.  
     
     
         12 . A method of producing a nickel-free white copper alloy, comprising: preparing an alloy represented by the general formula Cu a Zn b Ti c X d  wherein X is at least one element selected from the group consisting of Al, Sn, Ag and Mn, b, c and d are, in mass %, 0.5≦b≦30, 1≦c<7 and 0.1<d<4, and a is the balance, with other unavoidable elements also possibly being contained; heating the alloy to 700 to 885° C.; and cooling the alloy.  
     
     
         13 . The method of producing a nickel-free white copper alloy according to  claim 11 , wherein the nickel-free white copper alloy is composed of a single α-phase at room temperature.  
     
     
         14 . The method of producing a nickel-free white copper alloy according to  claim 12 , wherein the nickel-free white copper alloy is composed of a single α-phase at room temperature.  
     
     
         15 . The method of producing a nickel-free white copper alloy according to  claim 11 , wherein the nickel-free white copper alloy has a magnetization of 80 memu/g or less in a magnetic field of 18 kOe.  
     
     
         16 . The method of producing a nickel-free white copper alloy according to  claim 12 , wherein the nickel-free white copper alloy has a magnetization of 80 memu/g or less in a magnetic field of 18 kOe.  
     
     
         17 . The method of producing a nickel-free white copper alloy according to  claim 11 , wherein the nickel-free white copper alloy has a conductivity of 20% IACS or less.  
     
     
         18 . The method of producing a nickel-free white copper alloy according to  claim 12 , wherein the nickel-free white copper alloy has a conductivity of 20% IACS or less.

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