DE102008011355A1 - Platinum alloy, useful for producing a piece of jewelry, preferably a wedding ring or watch cases, comprises platinum, palladium, silver, copper and cobalt - Google Patents

Abstract

Described is a platinum alloy containing 39 to 82 wt .-% platinum. According to the invention, it is provided that the alloy has palladium in a proportion of 0.5 to 30% by weight and silver in a proportion of 10 to 52% by weight, the abovementioned proportions by weight complementing substantially 100% by weight ,

Description

The The invention relates to a platinum alloy containing 39 to 82% by weight of platinum and palladium, a process for producing such a platinum alloy and a piece of jewelry made from this platinum alloy, especially a wedding ring.

platinum is a rare and therefore expensive precious metal. Until now in the jewelry industry used essentially in four classes of platinum alloy, viz Pt950, Pt900, Pt750 and Pt585, that is, the aforementioned Alloys have a platinum content of 95% by weight, 90% by weight, 75 wt .-% and 58.5 wt .-% on. To be less well-heeled now Consumers purchase of jewelry made of platinum alloys to enable multi-faceted aspirations are underway, a part of the platinum of the alloy by a cheaper Mate rial but it should be ensured that the made of such an alloy jewelry from their visual impression not or only slightly from a high-alloyed Deviate from Pt950 alloy.

In the US 2,279,763 For example, a platinum alloy containing platinum in a proportion of 10 to 80% by weight, palladium in a proportion of 12 to 90% by weight and ruthenium in a proportion of 1 to 15% by weight is described. Although such an alloy is cheaper to produce than a Pt950 alloy, since palladium is less rare and therefore less expensive than platinum. However, palladium is still relatively expensive, so that even such an alloy is attributable to the high-priced sector.

From the US 6,048,492 For example, a platinum alloy containing 58.5 weight percent platinum, 24.5 to 36.5 weight percent palladium and iridium, cobalt or ruthenium in an amount between 5 and 15 weight percent is known. Also, such an alloy containing palladium in a proportion of 26.5 and 36.5 wt .-% is still relatively expensive and also difficult to produce.

The WO 2005/075690 discloses two platinum alloys wherein the first platinum alloy comprises 55 to 63 wt.% platinum, 2 to 10 wt.% cobalt and 27 to 42 wt.% copper and the second alloy described in this document 70 to 79.5 wt. % Platinum, 2 to 10 wt .-% cobalt and 10.5 to 28 wt .-% copper. Although such an alloy is cheaper to produce than cobalt because of its material, the high proportion of cobalt in the alloys described therein makes these platinum alloys not easy to produce and problem-free processing is not guaranteed.

The DE 20 2007 006 994 Applicant describes a platinum alloy comprising 39 to 82% by weight of platinum, 0.5 to 30% by weight of palladium and copper in a proportion of 10 to 52% by weight, it being possible for up to 20% to be used % By weight of copper can be replaced by the same amount of silver. Such an alloy is characterized by a relatively low platinum and palladium content, is sufficiently ductile and differs in their optical and mechanical properties not or only insignificantly from a high-alloy Pt950 alloy. However, it has been shown that buyers prefer platinum alloys which contain no or only a small proportion of base metals such as copper or cobalt.

It Therefore, the object of the present invention is a platinum alloy and a process for their preparation and one of this alloy ready to put the finished piece of jewelry at a Altogether, a relatively low platinum content results in a high proportion of noble metal has, inexpensive to produce and sufficiently simple is to be processed.

These The object is achieved according to the invention that the alloy in addition to the aforementioned proportion of platinum palladium in a proportion of 5 to 56% by weight and silver in a proportion of 56 to 5 wt .-%, wherein the abovementioned proportions by weight essentially add to 100 wt .-%.

By the measures according to the invention will in an advantageous manner, an alloy is created characterized by a relatively low platinum and palladium content, However, it is ductile enough and in its optical and mechanical Properties not or only slightly of a high-alloyed Pt950 alloy is different. Since the platinum a high proportion of Precious metals palladium and silver is alloyed, which stands out platinum alloy according to the invention in particular by a high total precious metal content and is therefore the Requirements and expectations of buyers just.

One Another advantage of the inventive measures is that this alloy is especially for the production of jewelry is suitable because the alloy of the invention is particularly suitable for the production of thick sheets, from which then pieces of jewelry, especially wedding rings, or watch cases, be made.

A advantageous development of the invention provides that the alloy 78 to 82% by weight of platinum, preferably 80% by weight of platinum, 0.5 to 15% by weight of palladium and 5 to 19.5% by weight of silver.

A Further advantageous development of the invention provides that the alloy is 64 to 66 weight percent platinum, 5 to 20 weight percent palladium and 12 to 31 wt .-% silver.

A Further advantageous development of the invention provides that the alloy 59 to 61 wt .-% platinum, 5 to 20 wt .-% palladium and 19 to 36 wt .-% silver.

A Further advantageous development of the invention provides that the alloy according to the invention 49 to 51% by weight Platinum, 9 to 30 wt .-% palladium and 29 to 42 wt .-% silver.

A Further advantageous development of the invention provides that the alloy according to the invention 44 to 46% by weight Platinum, 9 to 30 wt .-% palladium and 24 to 47 wt .-% silver.

A Further advantageous development of the invention provides that the inventive alloy 39 to 41 platinum, 9 to 30 wt .-% palladium and 29 to 52 wt .-% silver.

A advantageous development of the invention provides that the inventive Alloy small amounts of copper in a range of 0.5 to 20 Wt .-% and 10 to 16 wt .-% cobalt are added, wherein then the platinum, palladium, silver and copper and cobalt content essentially to 100 wt .-% he complete. Such formed alloy is particularly suitable for one Use in applications where special properties, such as z. As a high hardness, abrasion resistance or spring properties be required. The alloy according to the invention has the further advantage that this alloy in particular allows the drawing of very thin pipes.

A Further advantageous development of the invention provides that the alloy is a grain refiner in a proportion of from 00.1 to 0.2 Wt .-% contains.

A Further advantageous development of the invention provides that the grain refiner is osmium, ruthenium, iridium or rhodium. These the platinum group associated metals are in an advantageous manner very high melting point.

Further advantageous developments of the invention are the subject of the dependent claims.

Further Advantages and details of the invention are the embodiments to be taken, which are described below.

One First embodiment of the invention provides that the alloy 75 to 82% by weight of platinum, preferably 80% by weight of platinum, 0.5 to 15% by weight of palladium and 5 to 19.5% by weight of silver, this being the same as all of those described below Embodiments, the weight proportions of each mentioned Components are essentially complementary to 100 wt .-%. Supplement the formulation "substantially up to 100% by weight", as used here means that with it all alloying components except for usual contaminants and property-improving ones Additives such. B. hardener, deoxidizer, grain refiner, viscosity reducing agents or color modifiers are indicated. The total of the latter property-improving Average is preferably less than 1 wt .-%, preferably less than 0.2% by weight, if the following described embodiments are not stated otherwise is.

at the above-mentioned alloy is preferred that the proportion of platinum 80% by weight, the proportion of palladium 13 to 17% by weight and the proportion of silver is 3 to 7% by weight. So is it is also possible, with a share of 82 wt .-% platinum one Proportion of 0.5 to 5 wt .-% palladium and 15 to 19.5 wt .-% silver to use, preferably in a proportion of 80 wt .-% Platinum a proportion of 13 to 17 wt .-% palladium and 3 to 7 wt .-% Silver or a proportion of 0.5 to 5 wt .-% palladium and 15 bis 19.5 wt .-% silver is used.

Preferably it is envisaged that this alloy would be a grain refiner such as osmium, Ruthenium, iridium or rhodium in a proportion of 0.01 to 0.2% by weight is added.

One second embodiment of the invention provides that the alloy is 64 to 66 weight percent platinum, 5 to 20 weight percent palladium and 22 to 31 wt .-% silver, preferably in a Proportion of 62 to 64 wt .-% platinum, a proportion of 20 wt .-% palladium and 16 to 18% by weight of silver is used.

Also Can be a grain refiner such as osmium, rhodium, iridium or ruthenium be added in a proportion of 0.01 to 0.2 wt .-%. It is possible in the described second embodiment, replace up to 10% by weight of copper with the same amount of silver.

A third embodiment of an alloy provides that the alloy contains 59 to 61 wt .-% platinum, 5 to 30 wt .-% palladium and 9 to 36 wt .-% silver. It is again preferred that in each case a high proportion of palladium is used, so that in a proportion of 59 to 61 wt .-% platinum, a proportion of 20 wt .-% palladium and 19 to 21 wt .-% silver is present. Preferred is a Platinum alloy comprising 60% by weight of platinum, 30% by weight of palladium and 10% by weight of silver.

It It is further preferred that this alloy be a grain refiner is added in a proportion of 0.01 to 0.2 wt .-%, wherein the Grain refiners preferably osmium, rhodium, iridium or ruthenium is.

One fourth embodiment provides that the alloy 49 to 51 wt .-% platinum, 9 to 30 wt .-% palladium and the balance Contains silver, with grains such as osmium, Rhodium, iridium or ruthenium in a proportion of 0.01 to 0.2 wt .-% used.

One Fifth embodiment provides that the Alloy 44 to 46 wt .-% platinum, 9 to 30 wt .-% palladium and Contains 44 to 47 wt .-% of silver, again preferred is that a high palladium content is present, so that the Example of a preferred alloy 44 to 46% by weight platinum, 30% by weight Palladium and 24 to 26 wt .-% silver.

One sixth embodiment provides that the alloy 39 to 41 wt .-% platinum, 9 to 40 wt .-% palladium and 19 to 52 Wt .-% silver, again being preferred that a high proportion of palladium is used. For example, it is preferred that at a proportion of 39 to 41 wt .-% platinum, the palladium content 40 wt .-% and the silver content 29 to 31 wt .-% is. Again, grain refiner can be added again as described above.

at Further embodiments of the platinum alloy can be provided that the above-described alloys still a proportion of 0.5 to 20 wt .-% of copper and cobalt in a proportion of 11 to 16 wt .-% is alloyed. Such alloys have the Advantage that the hereby created alloys especially drawable are so that the described alloys are especially for manufacturing thin, drawable tubes are suitable. It is preferred here an embodiment with 60 wt .-% platinum, 10 wt .-% palladium, 11 wt .-% cobalt and 19 wt .-% copper.

The Process for preparing the alloy provides that platinum, Palladium and silver and optionally copper and cobalt in described Mixed ratio and this mixture then melted becomes.

A such produced alloy is particularly suitable for the production of a raw material for jewelery to be used.

The described method for producing an alloy and the Alloy produced with it are characterized in that thereby a raw material is produced, which in an advantageous manner and Way a production of cheap platinum jewelry allows. The method described is further characterized by that with him a production of platinum alloys over allows a wide range of platinum concentrations becomes.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - US 2279763 [0003]
• - US 6048492 [0004]
• WO 2005/075690 [0005]
• - DE 202007006994 [0006]

Claims (21)

Platinum alloy containing 39 to 82 wt .-% platinum, characterized in that the alloy palladium in a proportion of 0.5 to 30 wt .-% and silver in a proportion of 10 to 52 wt .-%, wherein the abovementioned proportions by weight add up to substantially 100% by weight. Platinum alloy according to claim 1, characterized that the alloy 78 to 82 wt .-% platinum, 0.5 to 15 wt .-% palladium and 5 to 19.5% by weight of silver. Platinum alloy according to claim 2, characterized that the alloy 78 to 82 wt .-% platinum, 15 wt .-% palladium and 3 to 7 wt .-% silver. Platinum alloy according to claim 2, characterized that the alloy 78 to 82 wt .-% platinum, 0.5 to 5 wt .-% palladium and 15 to 19.5% by weight of silver. Platinum alloy according to claim 1, characterized that the alloy palladium in a proportion of 5 to 30 wt .-% and silver in a proportion of 10 to 52% by weight. Platinum alloy according to claim 1, characterized that the alloy 64 to 66 wt .-% platinum, 5 to 20 wt .-% palladium and 24 to 31 wt .-% silver. Platinum alloy according to claim 7, characterized that the alloy 64 to 66 wt .-% platinum, 20 wt .-% palladium and 16 to 18 wt .-% silver. Platinum alloy according to claim 1, characterized that the alloy 59 to 61 wt .-% platinum, 5 to 30 wt .-% palladium and 9 to 36% by weight of silver. Platinum alloy according to claim 8, characterized in that that the alloy contains 59 to 61% by weight of platinum, preferably 60% by weight Platinum, 30% by weight of palladium and 9 to 11% by weight of silver, preferably 10 % By weight of silver. Platinum alloy according to claim 1, characterized that the alloy 40 to 51 wt .-% platinum, 9 to 30 wt .-% palladium and 29 to 42 wt .-% silver. Platinum alloy according to claim 10, characterized that the alloy 49 to 51 wt .-% platinum, 30 wt .-% palladium and 19 to 21 wt .-% silver. Platinum alloy according to claim 1, characterized that the alloy 44 to 46 wt .-% platinum, 9 to 30 wt .-% palladium and 24 to 47% by weight of silver. Platinum alloy according to claim 12, characterized in that that the alloy 24 to 46 wt .-% platinum, 30 wt .-% palladium and 24 to 26 wt .-% silver. Platinum alloy according to claim 1, characterized that the alloy 39 to 41 wt .-% platinum, 9 to 40 wt .-% palladium and 19 to 52 wt .-% silver. Platinum alloy according to claim 14, characterized that the alloy 39 to 41 wt .-% platinum, 40 wt .-% palladium and 19 to 21 wt .-% silver. Platinum alloy according to one of the preceding claims, characterized in that the alloy is from 0.5 to 20% by weight of copper and 11 to 16 wt .-% cobalt Platinum alloy according to one of the preceding claims, characterized in that the alloy is a grain refiner in a Contains 0.01 to 0.2 wt .-%. Platinum alloy according to claim 17, characterized that the grain is fine, osmium, rhodium, iridium or ruthenium. Process for producing an alloy according to one of claims 1 to 18, characterized in that platinum, Palladium and copper are mixed and the mixture is then melted becomes. Use of a platinum alloy according to one of Claims 1 to 18 for the production of a piece of jewelry. Jewel, characterized in that the jewel of an alloy according to a of claims 1 to 18 is produced.