JPH01123038A - Palladium alloy for ornamentation - Google Patents

Abstract

PURPOSE:To produce a palladium alloy for ornamentation having high strength and corrosion resistance by compounding Pd and W respectively at specific ratios. CONSTITUTION:The palladium alloy for ornamentation which can be adjusted in color tones is prepd. by consisting the alloy, by weight, of 50-95% Pd and 5-50% W and adding at least one kind of elements among 1-10% W, 1-10% Cr, 1-10% Au, 1-10% Ni, 0.5-5% Sb, 0.5-5% V, and 0.1-1% B thereto. The palladium alloy which is useful for personal ornaments such as watch frames, watch bands, rings, and necklaces is thereby obtd.

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology can be used not only as a watch frame, but also as a material for ornaments such as watch bands, rings, necklaces, etc. Platinum and silver color It belongs to the technical field of palladium alloys with

<Prior Art> As is well known to those skilled in the art, gold alloys, silver alloys, and platinum are conventionally used as precious metal alloys for decorative alloys for white watch frames and watch bands, as well as accessories such as rings and necklaces. There is an alloy.

<Problems to be Solved by the Invention> However, these metal materials have overlapping advantages and disadvantages for a long time.

In other words, for example, gold alloys and platinum alloys have advantages in terms of functionality and decorative value in the case of Time G1 materials, but on the other hand, they have the disadvantage of high costs, as well as high metal costs. There is also a disadvantage that fluctuations in the value have a large impact on the price, and there is also a lack of analysis as a material for watches.

Furthermore, silver alloys have the advantage of having a unique warm silvery white color tone, but they have practical disadvantages of insufficient strength and poor sulfidation resistance.

<Objective of the Invention> The object of the invention of this application is based on the above-mentioned prior art. <To solve the problems that conventional decorative alloys for accessories such as watch frames have, which have contradictory advantages and disadvantages. This is a technical issue that should be addressed, and while taking advantage of good alloy properties, it has a platinum and silver tone that is difficult to reproduce with palladium, and is also able to fully demonstrate its function as a structural material for watches etc. An excellent decorative palladium alloy that has excellent mechanical strength and workability, and has sufficient corrosion resistance during use, which is useful for metal processing technology applications in the manufacturing industry of practical products and decorative products. This is what we intend to provide.

<Means/effects for solving the problem> In accordance with the above-mentioned purpose, the structure of the invention of this application, which is summarized in the scope of the above-mentioned patent claims, is to solve the above-mentioned problem, by providing a watch frame, a watch band,
Palladium is 50-95% and tungsten is 5-50%, which has the basic characteristics used in accessories such as rings and necklaces, and molybdenum is 1-10% for palladium-based alloys with the basic characteristics. %, chromium 1-10%, gold 1-10%, nickel 1-10%, antimony 0.5-5%, vanadium 0.5-5%, boron 0.1-1%. It is possible to adjust the color tone by adding one type of resin, and technical measures have been taken to ensure that it has high strength and corrosion resistance.

<Background of the Invention> Next, to describe the qualitative and quantitative background of the invention of this application, palladium, which is the main component, is made to be difficult to undergo chemical changes by acids and has characteristics that make it difficult to be oxidized in the air. According to experiments, in order to function as a stabilizing element, a weight ratio of 50% or more is required, and if it exceeds 95%, for example, the strength required for a watch case cannot be achieved. This is because they will not be able to hold it.

Therefore, it has been found that the optimum mold set is preferably in the range of 50 to 95%.

Next, regarding molybdenum, experiments have shown that it acts to control the color tone of products and is important as a function that contributes to aesthetics.Furthermore, experiments have shown that molybdenum can provide excellent properties such as deoxidizing effect when dissolving materials. The above has been confirmed.

And their maximum effective mold combination ratio is 1 to 10
% range.

Next, chromium and nickel act to control the color tone of the product, and can also improve mechanical strength, and if their weight ratio is less than 1%, there is no effect, and if it exceeds 10%, the color tone becomes stainless steel. I found that as the color approached, the platinum and silver tones collapsed.

Gold is useful for increasing the mechanical strength of the material, has an effect on discoloration resistance, and can further improve machinability and polishability.

According to experiments, their optimal ranges are 1 to 10%, respectively.
It was found that the range is optimal.

Next, regarding vanadium, it is well known that palladium, the base material, has a high gas absorption property, but it is said that it absorbs 350 to 850 times more hydrogen by volume, and vanadium is not effective as a dehydration material. The optimum range is set at 0.5 to 5% because it is ineffective if it is less than 0.5% and causes embrittlement if it exceeds 5%.

Second, antimony helps lower the melting point, which is 1800°C for the base palladium-tungsten alloy.
However, it is known that the addition of antimony makes it possible to relatively lower the liquidus point and improve the melting and casting properties during material production, and the range is less than 0.5%. However, if it exceeds 5%, the material becomes brittle, so it was set in the range of 0.5 to 5% based on experimental data.

Finally, regarding boron, it is possible to stabilize the crystal grain composition by dissolving and removing the total oxide, and the range is from 0.1% to 0.1%, since it is ineffective if it is less than 0.1% and causes embrittlement if it exceeds 1%.
The range was set at 1%.

Next, we will compare the embodiments of the invention of this application with known examples and artificial Pd.
-W Higashi Nao, each sample alloy was made by arc melting palladium-tungsten in advance, and using it as a master alloy, each material was melted for 30 minutes at a melting temperature of 1800°C in a well-known high frequency heating melting furnace. After casting into a shape of W50xL 100mm, it is possible to roll it into a predetermined shape using cold rolling rolls.

Next, the processed material of each sample obtained as described above was processed at a processing rate of 50.
The required number of sheets were cut to perform hardness, tensile tests, discoloration tests due to artificial sweat, and specular color difference measurements.

The test results are as shown in Table n.
Pd-W In addition, the hardness test was carried out using a two-micrometer hardness tester at a load of 2009.
Measured under the condition of loading time of 30 seconds.

Tensile strength measurement test: The tensile strength of a tensile test piece (JIS6 Tan test piece) was measured using a Tensilon tensile tester at a tensile speed of 100 m/min.

Discoloration test: The degree of discoloration was investigated by immersing it in artificial sweat with the following mixing ratio for 24 hours in a constant temperature box at 50±2°C.

Chloride 0.648-0.987% Sulfide 0.006-0.0025% Urea 0.086-0.173% Ammonia o, oio
~0.018% Sucrose 0.006~0.022
% milk MO, 034~0.107% distilled water Residual color difference measurement: Measure the color difference between 90% platinum and palladium alloy using a specular reflection colorimeter that measures the color of objects that are colored by specularly reflected light, such as metal color. measurement.

L (lightness) 116 (Y/Yn) 1/3-16 Y/Yn > G, QO8856 a (chromaticity) 500 [(X/Xn) 1/3 - (Y/Yn) 1/3] b
(Chromaticity) 200[(Y/Yn)"3-(Z/Zn)1/3]ΔE
ab Difference in Overall Color Tone As can be seen from the above test data, the decorative palladium alloy of the example at the beginning of this application has sufficient hardness and mechanical strength, has good corrosion resistance, and is superior to platinum. It can be seen that the difference from the silver color tone is also significantly better.

〈Effect of invention〉 As described above, according to the invention of this application, the clock frame and the hour W.

Palladium alloys are used as materials for accessories such as bands, rings, necklaces, etc. Although they have all the good qualities of precious metals, they lack hardness and mechanical strength, so the products retain their shape. It has excellent properties such as good durability and functions as an ornament, and has excellent corrosion resistance, so it can retain its functional properties as an ornament such as jewelry over time. It is played.

In addition, the platinum and silver tones are satisfactory, and gold alloys and gold alloys are also suitable for ornaments such as jewelry.
The price of platinum alloy is not as high as that of platinum alloys, and it is less affected by price fluctuations, making it possible to maintain a stable supply.

It has these functional properties along with corrosion resistance and has a color tone of 11.
Good adjustment function and stable price
': This has the excellent effect of providing stable reliability not only in the production and supply of jewelry, but also in terms of use.

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Claims (2)

[Claims] (1) A decorative palladium alloy comprising 50 to 95% palladium and 5 to 50% tungsten by weight. (2) An alloy consisting of 50-95% palladium and 5-50% tungsten by weight, with 1-10% molybdenum, 1-10% chromium, 1-10% gold, and 1-10% nickel.
, antimony 0.5-5%, vanadium 0.5-5%,
A decorative palladium alloy characterized by adding at least one element with a weight ratio of 0.1 to 1% boron to adjust color tone and increase strength.