JPH01123037A - 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 Mo respectively at specific ratios. CONSTITUTION:The palladium alloy for ornamentation which can be adjusted in color tones is prepd. by incorporating, by weight, 50-95% Pd and 5-50% Mo therein and adding at least one kind of elements among 1-10% W, 1-10% Cr, 1-10% Au, 1-10% Pt, 0.5-5% V, 0.5-5% Sb, 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 accessories such as hour δ1 bands, rings, necklaces, etc. It belongs to the technical field of decorative palladium alloys with platinum and silver color.

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

<Problems to be Solved by the Invention> All of these decorative metal materials have overlapping advantages and disadvantages, as described below.

For example, when it comes to gold alloys and platinum alloys, they have advantages in terms of functionality and ornamental value, but they also have disadvantages of high costs, as well as high metal costs. The price is greatly affected by fluctuations, and there are some defects that make it less novel as a training material.

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

<Object of the Invention> The object of the invention of this application is to solve the problems that the alloys for decoration of accessories such as watch frames based on the above-mentioned prior art have contradictory advantages and disadvantages. This is a technical issue that should be addressed, and while taking advantage of the good alloy properties, it has a platinum and silver tone that is difficult to reproduce with palladium, and furthermore, it has the ability to fully demonstrate its function as a structural material for special training purposes. Has mechanical strength and workability,
Furthermore, it is an object of the present invention to provide an excellent decorative palladium alloy which has sufficient corrosion resistance during use and is useful in the application field of metal processing technology in the manufacturing industry of industrial products such as interior parts.

<Means/effects for solving the problems> 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 problems by providing a watch frame, a watch band,
It has the basic characteristics of 50-95% palladium and 5-50% molybdenum, which are used in accessories such as rings and necklaces, and further contains 1-10% tungsten and 1-10% chromium. 10%, gold 1~
The color tone can be adjusted by adding at least one element by weight of 10%, platinum 1-10%, vanadium 0.5-5%, antimony 0.5-5%, and boron 0.1-1%. , technical measures have been taken to ensure 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, has characteristics that make it difficult to undergo chemical changes by acids and that it is difficult to be oxidized in the air. In order for it to function as a stabilizing element, its weight ratio must be 50% or more, and if it exceeds 95%, it will not have the strength necessary for a watch case, for example. Moreover, it becomes difficult to adjust the color tone.

Therefore, the optimal weight is 50 to 95 depending on experiments etc.
% range is preferred.

Regarding molybdenum, it is basically possible to cancel out the dull white color tone peculiar to palladium and make it closer to the so-called platinum or silver color.Molybdenum has no effect if it contains less than 5% by weight, but if it contains more than 50% by weight, it has no effect. In the state, embrittlement is 1
This makes it difficult to punch out the material itself and even the clock frame.

In addition, tungsten is a component that can increase the strength of the material alloy and improve the grindability during processing required for watch frame materials, etc. If its weight ratio is less than 1%, it will not be effective, and if it exceeds 10%, it will not be effective. It was found through experiments that the workability during pressing was poor.

Therefore, chromium acts to control the color tone of the product and can also improve mechanical strength, and if its weight ratio is less than 1%, it has no effect;
If it exceeds 0%, the color tone approaches stainless steel color, and the platinum and silver color tone becomes distorted.

And, their maximum effective ratio is 1 to 10.
It was experimentally found that the range of %.

Next, gold and platinum are useful for increasing the mechanical strength of the material, are also effective in discoloration resistance, and can further improve cutting and polishing properties.

The optimum range is set to be within the range of 1 to 10%, because if it is less than 1%, there will be no effect, and if it exceeds 10%, the material cost will increase and the purpose will not be met.

As for 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, making vanadium effective as a dehydration material. The optimum range is experimentally determined to be between 0.5 and 5%, since less than 0.15% is ineffective and more than 5% causes embrittlement.

Next, antimony is useful for lowering the melting point, which exceeds 1800°C in the base palladium-molybdenum alloy, but adding antimony makes it possible to relatively lower the liquidus point, making it possible to melt during material production. It is known that it improves castability, and if it is less than 0.5%, it is ineffective, and if it exceeds 5%, it will cause the material to become brittle.
The range was 5%.

Finally, boron dissolves and removes metal oxides and stabilizes crystal grain constituents, and if it is less than 0.1%, it will not be effective, and if it exceeds 1%, it will cause embrittlement, so if it is less than 0.1%, it will cause embrittlement.
It is within the range of 1% to 1%.

Next, a detailed explanation of the invention of this application is as follows.

First, samples of alloys according to embodiments of the invention of this application and alloys of known examples are not shown.

The alloy of each sample was made by arc melting palladium and molybdenum 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 the shape, it is possible to roll it into a predetermined shape using cold rolling rolls.

Table IPd-M.

*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 ■.

Table II Pd-M○ In addition, hardness test 2 micro Vickers hardness cutting with a load of 2oog
Measured under the condition of loading time of 30 seconds.

Tensile strength measurement test: The tensile strength of a tensile test piece (JIS No. 6 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% Urine
Element 0.086-0.173% ammonia o, o
io~0.018% sucrose 0.006~0.0
22~Lactic acid 0.034~0.107% distilled water Residual color difference measurement: Measure the color difference between 90% platinum-palladium alloy using a specular reflection colorimeter that measures the color of objects that are colored by specularly reflected light, such as metal colors. measurement.

L (lightness) 116 (Y/Yn)" 3-16 Y/Yn > 0.008856 a (chromaticity) 500 [(X/Xn)" 3-(Y/Yn) 1/3] b (
Chromaticity) 200 [(Y/Yn)"3-(Z/Zn)1/3]l
Eab Overall color tone difference As can be seen from the above test data, the decorative palladium alloy of the embodiment of the invention of this application has sufficient hardness and mechanical strength, and has good corrosion resistance. It can be seen that the difference from the silver color tone is also significantly better.

It goes without saying that aspects other than the above-mentioned embodiments can also be adopted as the embodiments of the invention of this application.

<Effects of the Invention> As described above, according to the invention of this application, a palladium alloy for decoration as a material for accessories such as hour frames, watch bands, rings, necklaces, etc. has all the advantages of precious metals, but Because the product has sufficient hardness and mechanical strength, it has good shape retention and is suitable for use as an accessory (IE). The excellent effect of being able to be distributed evenly over time is achieved.

In addition, the platinum and silver tones are satisfactory, and in addition, the price for jewelry is not as high as that of gold alloys and platinum alloys, and it is less affected by price fluctuations, ensuring a stable supply. The effect is that it can be done.

It has these functional properties as well as corrosion resistance, has good color tone adjustment function, and is stable in price, so it is not only suitable for manufacturing and supplying decorative items such as jewelry, but also for stable use. This has the excellent effect of gaining trust.

Claims (2)

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