Bronze alloy

Abstract

To provide a bronze alloy that is easily castable, exhibits resistance to corrosion and seawater, is dermatologically safe and particularly skin-friendly, tarnishes slowly, and has a distinctive warm tone.SOLUTION: The invention relates to a bronze alloy containing copper and tin, particularly for production of accessories, such as ornaments, jewels, watches and watch housings. The bronze alloy includes gold as an additional alloying component, where a tin content is 7-9 wt.% and a gold content is 19-26 wt.%. A total sum of the copper, tin and gold contents accounts for more than 99.95 wt.% of the bronze alloy, with a remainder to 100 wt.% consisting of unavoidable impurities.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention particularly relates to bronze alloys containing copper and tin for producing decorative articles such as jewelry, jewellery, watches and watch housings. [Background technology]

[0002] Such bronze alloys are known for their good strength and excellent workability, and it is common to add a wide range of other metals and elements, such as aluminum, lead, manganese, silicon, beryllium, phosphorus, magnesium, or cadmium, as alloying elements to achieve desired requirements and / or appearance. Summary of the Invention [Problem to be solved by the invention]

[0003] The object of the present invention is to provide a bronze alloy of the type mentioned at the beginning which is easily castable, corrosion-resistant and seawater-resistant, while being dermatologically harmless and particularly skin-friendly, is resistant to tarnishing and has a unique warm color tone. [Means for solving the problem]

[0004] In order to achieve this object, the bronze alloy according to the present invention is characterized in that the bronze alloy comprises gold as a further alloying component, the proportion of tin being 7-9% by weight, the proportion of gold being 19-26% by weight, the sum of the proportions of copper, tin and gold being more than 99.95% by weight of the bronze alloy, the remainder up to 100% by weight being unavoidable impurities.

[0005] Not only do these alloying elements provide the relevant properties for the problem, in particular the bronze alloy's resistance to or lack of tarnishing, but the gold element also provides a material with a stable value.

[0006] Furthermore, the total proportion of copper, tin and gold in the bronze alloy exceeds 99.95% by weight, which has the advantage that the bronze alloy containing these three components has a high purity and is particularly gentle on the skin, so that the ornament made of this bronze alloy can be worn particularly comfortably on the human skin without causing irritation and has a high body compatibility.

[0007] The proportion of tin is preferably 8% by weight.

[0008] When the proportion of gold in the bronze alloy is 20% by weight, the tarnishing of the bronze alloy occurs very slowly.

[0009] If the proportion of gold in the bronze alloy is 25% by weight, the bronze alloy will at least almost never tarnish, but will retain its bronze color.

[0010] If the total proportion of copper, tin and gold in the bronze alloy exceeds 99.95% by weight, the high purity of the bronze alloy containing these three components makes it particularly gentle on the skin, so that jewelry made of this bronze alloy can be worn particularly comfortably on human skin without causing irritation and has a high body compatibility.

[0011] In particular, the total proportions of copper, tin and gold amount to 99.99% by weight of the bronze alloy, which results in a particularly high degree of body compatibility, since only non-toxic metals are used in this case.

[0012] A particularly high degree of physical compatibility is achieved if the copper content in the bronze alloy is 99.99 or higher in purity and is therefore the purest metal.

[0013] Similarly, particularly high physical compatibility is achieved when the tin content in the bronze alloy is 99.99 or higher in purity and is therefore the purest metal.

[0014] Likewise, particularly high body compatibility is achieved when the gold component in the bronze alloy has a purity of 99.99 or higher and is therefore the purest metal.

[0015] The above-mentioned advantages lead to the use of bronze alloys for manufacturing decorative articles such as jewelry, jewellery, accessories, watches and watch housings and / or components thereof.

Claims

1. A bronze alloy containing copper and tin for producing decorative articles, in particular ornaments, jewellery, watches and watch housings, comprising:

1. A bronze alloy comprising gold as a further alloy component, characterized in that the proportion of tin is 7-9% by weight, the proportion of gold is 19-26% by weight, and the sum of the proportions of copper, tin and gold is more than 99.95% by weight of the bronze alloy, the remainder to 100% by weight being unavoidable impurities.

2. 2. The bronze alloy according to claim 1, characterized in that the proportion of tin is 8% by weight.

3. 3. A bronze alloy according to claim 1 or 2, characterized in that the proportion of gold is 20% by weight.

4. 3. A bronze alloy according to claims 1 and 2, characterized in that the proportion of gold is 25% by weight.

5. The bronze alloy according to any one of claims 1 to 4, characterized in that the total proportion of copper, tin and gold is 99.99% by weight of the bronze alloy.

6. The bronze alloy according to any one of claims 1 to 5, characterized in that the purity of the copper component in the bronze alloy is 99.99 or more.

7. The bronze alloy according to any one of claims 1 to 6, characterized in that the purity of the tin component in the bronze alloy is 99.99 or more.

8. The bronze alloy according to any one of claims 1 to 7, characterized in that the purity of the gold component in the bronze alloy is 99.99 or more.

9. Use of the bronze alloy according to any one of claims 1 to 8 for the manufacture of decorative articles, such as ornaments, jewellery, accessories, watches and watch housings and / or components thereof.