White-colored copper alloy with reduced nickel content

a technology of nickel content and white-colored copper, which is applied in the field of white-colored copperbased alloys, can solve the problems of difficult to achieve good white colors without strong, nickel is more expensive than most other alloying elements, and alloys are expensiv

Inactive Publication Date: 2010-03-11
PMX IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0022]Among the advantages of at least one embodiment of the present invention is that the white-colored copper-base alloy of the invention has antimicrobial properties. The inactivation rate of bacteria placed on a surface composed of the alloy of at ...

Problems solved by technology

Alloys with a whiter color (reflecting all light wavelengths more uniformly) are also available, although it is generally difficult to achieve good white colors without strong reddish or yellowish overtones, particularly after the material has tarnished or partially oxidized.
Unfortunately, nickel is more expensive than most other alloying elements, and has been implicated as a major contributor to increased cases of allergic contact dermatitis when used in contact ...

Method used

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  • White-colored copper alloy with reduced nickel content
  • White-colored copper alloy with reduced nickel content
  • White-colored copper alloy with reduced nickel content

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Embodiment Construction

[0039]Determination of color (of alloys or other materials) may be by spectroscopy or other objective means. Instruments such as those supplied by X-Rite, Inc. (Grand Rapids, Mich.) or Hunter Associates Laboratory, Inc. (Reston, Va.) quantify color according to two chromatic attributes “hue” and “chroma” and a lightness attribute known as “value”. Hue is color perception, the recognition of an object as red, green, yellow, blue, etc. Chroma is the color concentration (intensity or saturation), ranging from gray to the pure hue. Value is a measure of the lightness of the color tone, ranging from pure white to pure black. A combination of these values gives a unique location in color space in polar coordinates, with hue denoting color tone (angular location), chroma denoting intensity (radial location), and value denoting lightness (vertical location) in FIG. 1.

[0040]An alternative method of specifying color is by the CIELAB scale. CIE stands for Commission Internationale de l'Eclaira...

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Abstract

Disclosed is a white-colored copper alloy comprising by weight up to 30% zinc, up to 20% manganese, up to 5% nickel with the balance copper. This alloy may have from 6% to 25% zinc, from 4% to 17% manganese, from 0.1% to 3.5% nickel and the balance copper. The balance copper in the alloy may further contain at least one of: up to 0.5% of at least one of the group which consists of Sn, Si, Co, Ti, Cr, Fe, Mg, Zr, and Ag; and up to 0.1% of at least one of the group which consists of P, B, Ca, Ge, Se, Te. It may also contain up to 0.3% Zr by weight. The alloy may have an electrical conductivity greater than 2.5% IACS at eddy current gauge exciting frequencies between 60 kHz and 480 kHz.

Description

[0001]The invention claims the benefit of priority of U.S. Provisional Patent Application No. 61 / 095,719, “WHITE-COLORED COPPER ALLOY WITH REDUCED NICKEL CONTENT”, filed on Sep. 10, 2008 and U.S. Provisional Patent No. 61 / 095,733 “IMPROVED WHITE-COLORED COPPER ALLOY WITH REDUCED NICKEL CONTENT” filed on Sep. 10, 2008.FIELD OF THE INVENTION[0002]This invention relates to white- or silver-colored copper-based alloys with reduced nickel content compared to standard alloys of similar color.BACKGROUND OF THE INVENTION[0003]Copper base alloys are widely used for their combination of ease of fabrication, corrosion resistance, electrical and thermal conductivity, and availability in a wide range of attractive colors. They are the preferred material worldwide for circulating coinage, in many cases as part of multi-layer composite systems. In addition, recent research has shown copper and copper alloy surfaces can be manufactured to be antimicrobial, inactivating a variety of microorganisms i...

Claims

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Application Information

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IPC IPC(8): C22C9/04C22C9/05C22C9/06
CPCC22C9/05C22C9/04
Inventor CLARK, CRAIGJOHNSON, THOMAS D.PRATT, RICHARDSUH, TIMOTHY
Owner PMX IND
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