Bronze alloy

Abstract

The invention relates to a bronze alloy containing copper and tin, particularly for the manufacture of jewelry such as jewelry, watches, and watch cases. The bronze alloy contains gold as a further alloying component, wherein the proportion of tin is between 7 and 9 percent by weight and the proportion of gold is between 19 and 26 percent by weight, and wherein the sum of the proportions of copper, tin, and gold is > 99.95 percent by weight of the bronze alloy, and the remainder (100 percent by weight) consists of unavoidable impurities.

Description

[0001] The invention relates to a bronze alloy containing copper and tin, in particular for the manufacture of jewelry such as jewelry, watch cases and watch cases.

[0002] Such bronze alloys are known for their good strength and workability. It is common practice 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 properties and / or a desired appearance.

[0003] The object of the invention is to create a bronze alloy of the type mentioned above which is easy to cast, which is resistant to corrosion and seawater, dermatologically safe and particularly skin-friendly, tarnishes slowly and has a distinctive warm color tone.

[0004] This problem is solved according to the invention by the bronze alloy containing gold as a further alloying component, wherein the proportion of tin is between 7 and 9 percent by weight and the proportion of gold is between 19 and 26 percent by weight, and wherein the sum of the proportions of copper, tin and gold is > 99.95 percent by weight of the bronze alloy and the remainder is unavoidable impurities up to 100 percent by weight.

[0005] These alloy components not only achieve the required properties, especially delayed tarnishing or even no tarnishing of the bronze alloy, but also, through the gold component, create a material with lasting value.

[0006] Furthermore, the total proportion of copper, tin, and gold exceeding 99.95% by weight in the bronze alloy offers the advantage that the high purity of the bronze alloy with these three components results in exceptional skin compatibility. Therefore, jewelry made from this bronze alloy can be worn particularly comfortably against the skin without causing irritation and exhibits excellent biocompatibility.

[0007] Preferably, the proportion of tin is 8 percent by weight.

[0008] If the proportion of gold is 20 percent by weight of the bronze alloy, the tarnishing of the bronze alloy will occur very slowly.

[0009] If the proportion of gold is 25 percent by weight of the bronze alloy, then at least to a large extent the bronze alloy will not tarnish, while the bronze color will remain.

[0010] If the sum of the copper, tin, and gold content is greater than 99.95% by weight of the bronze alloy, the high purity of the bronze alloy with these three components results in exceptional skin compatibility. Therefore, jewelry made from this bronze alloy can be worn very comfortably against the skin without causing irritation and exhibits high biocompatibility.

[0011] In particular, the sum of the proportions of copper, tin and gold is 99.99 percent by weight of the bronze alloy, which results in a particularly high biocompatibility, as only non-toxic metals are used.

[0012] Particularly high biocompatibility is achieved when the copper component of the bronze alloy has a purity level of ≥ 99.99, and is therefore a metal of the highest purity.

[0013] Similarly, particularly high biocompatibility is achieved when the tin component of the bronze alloy has a purity level of ≥ 99.99, and is therefore a metal of the highest purity.

[0014] Similarly, a particularly high level of biocompatibility is achieved when the gold component of the bronze alloy has a purity level of ≥ 99.99 and is therefore a metal of the highest purity.

[0015] The aforementioned advantages result from using the bronze alloy for the manufacture of jewelry such as jewelry, jewels, watches and watch cases and / or as a component thereof.

Claims

1. Bronze alloy containing copper and tin, particularly for the manufacture of ornaments such as jewellery, watches and watch cases, characterized in that the bronze alloy contains gold as a further alloy component, with the proportion of tin being between 7 and 9 percent by weight and the proportion of gold being between 19 and 26 percent by weight, and with the sum of the proportions of copper, tin and gold being > 99.95 percent by weight of the bronze alloy and the remainder being 100 percent by weight unavoidable impurities.

2. Bronze alloy according to claim 1, characterized in that the proportion of tin is 8 percent by weight.

3. Bronze alloy according to one of the preceding claims, characterized in that the proportion of gold is 20 percent by weight.

4. Bronze alloy according to one of claims 1 and 2, characterized in that the proportion of gold is 25 percent by weight.

5. Bronze alloy according to one of the preceding claims, characterized in thatthe sum of the proportions of copper, tin and gold is 99.99 percent by weight of the bronze alloy.

6. Bronze alloy according to one of the preceding claims, characterized in that the copper component of the bronze alloy has a purity of ≥ 99.

99.

7. Bronze alloy according to one of the preceding claims, characterized in that the tin component of the bronze alloy has a purity of ≥ 99.

99.

8. Bronze alloy according to one of the preceding claims, characterized in that the gold component of the bronze alloy has a purity of ≥ 99.99 9. Use of the bronze alloy according to any one of the preceding claims for the manufacture of jewellery items such as jewellery, jewellery articles, watches and watch cases and / or as a component thereof.

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