Bronze alloy

EP4482996A1Inactive Publication Date: 2025-01-01SCHMIDT LOTHAR
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Patent Information

Application Number
EP2023709922
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-02-25
Filing Date
2023-02-17
Publication Date
2025-01-01
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing bronze alloys used for ornaments and jewelry lack resistance to corrosion, particularly in seawater, and do not offer a delayed tarnish or a consistent, warm color tone, while also potentially causing skin irritation due to impurities.

Method used

A bronze alloy with a composition of 6-8% tin, 11.5-13.5% gold, and high-purity copper, tin, and gold (>99.99%) is developed, ensuring high purity and body compatibility, and adding gold as an alloy component to enhance corrosion resistance and aesthetic properties.

Benefits of technology

The resulting alloy is easy to cast, resistant to seawater corrosion, has a delayed tarnish, and a warm color tone, providing high body compatibility and comfort for jewelry and watch components.

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Abstract

The invention relates to a bronze alloy containing copper and tin, in particular for producing items of jewellery such as jewellery, bijouterie, watchs and watch cases. The bronze alloy contains gold as an additional alloy component, the proportion of tin being between 6 and 8 percent by weight and the proportion of gold being between 11.5 and 13.5 percent by weight.
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Description

[0001] Bronze alloy

[0002] The invention relates to a bronze alloy containing copper and tin, in particular for the production of ornaments such as jewelry, jewellery, watches and watch cases.

[0003] Such bronze alloys are known for their excellent strength and workability. It is common to add a wide range of other metals and elements, such as aluminum, lead, manganese, silicon, beryllium, phosphorus, magnesium, or even cadmium, as alloying elements to achieve desired requirements and / or a desired appearance.

[0004] The object of the invention is to create a bronze alloy of the type mentioned at the beginning which is easy to cast, which is resistant to corrosion and seawater and is dermatologically safe, has a delayed tarnishing and has a distinctive warm colour tone.

[0005] This object is achieved according to the invention in that the bronze alloy contains gold as a further alloy component, the proportion of tin being between 6 and 8 percent by weight and the proportion of gold being between 11.5 and 13.5 percent by weight.

[0006] These alloy components not only achieve the required properties, but the gold component also creates a material with lasting value.

[0007] Preferably, the proportion of tin is 7% by weight and the proportion of gold is 12.5% ​​by weight.

[0008] If the sum of the copper, tin, and gold components is > 99.95 percent by weight of the bronze alloy, the high purity of the bronze alloy with these three components results in particularly high skin-friendliness. This means that jewelry made of this bronze alloy can be worn particularly comfortably on a person's skin without causing irritation and is highly biocompatible.

[0009] In particular, the sum of the proportions of copper, tin and gold is 99.99

[0010] Weight percent of the bronze alloy, which results in particularly high biocompatibility, as only non-toxic metals are used. Particularly high biocompatibility is achieved when the copper component of the bronze alloy has a purity of > 99.99, making it a metal of the highest purity.

[0011] Likewise, a particularly high level of body compatibility is achieved if the tin component of the bronze alloy has a purity of > 99.99 and is therefore a metal of the highest purity.

[0012] Likewise, a particularly high level of body compatibility is achieved if the gold component of the bronze alloy has a purity of > 99.99 and is therefore a metal of the highest purity.

[0013] The above-mentioned advantages result from the use of the bronze alloy for the manufacture of ornaments such as jewelry, jewelry articles, jewelry items, watches and watch cases and / or as a component thereof.

Claims

Patent claims 1. A bronze alloy containing copper and tin, particularly for the manufacture of jewelry such as jewelry, watch cases, and watch jewelry, characterized in that the bronze alloy contains gold as a further alloying component, wherein the proportion of tin is between 6 and 8 percent by weight and the proportion of gold is between 11.5 and 13.5 percent by weight. A bronze alloy according to claim 1, characterized in that the proportion of tin is 7 percent by weight. A bronze alloy according to any one of the preceding claims, characterized in that the proportion of gold is 12.5 percent by weight. A bronze alloy according to any one of the preceding claims, characterized in that the sum of the proportions of copper, tin, and gold is > 99.95 percent by weight of the bronze alloy. Bronze alloy according to claim 4, characterized in that the sum of the proportions of copper, tin, and gold is 99.99% by weight of the bronze alloy. Bronze alloy according to any one of the preceding claims, characterized in that the copper component of the bronze alloy has a purity level of > 99.99%. Bronze alloy according to any one of the preceding claims, characterized in that the tin component of the bronze alloy has a purity level of > 99.99%. Bronze alloy according to any one of the preceding claims, characterized in that the gold component of the bronze alloy has a purity level of > 99.99%. Use of the bronze alloy according to any one of the preceding claims for the manufacture of jewelry such as jewelry, precious metalwork, watches, and watch cases, and / or as a component thereof.