JP2017014609A - Alloy for ornament, manufacturing method of alloy for ornament and ornament - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a Pt alloy high in purity and large in strength of hardness.SOLUTION: An alloy for ornament contains 99.90 wt.% to 99.95% of Pt and 0.05 wt.% to 0.10 wt.% of Ti and In. A manufacturing method of the alloy for ornament has a process of inputting 99.90 wt.% to 99.95% of Pt and more than 0.05 wt.% and smaller than 0.10 wt.% of Ti and In and Cu as main components in a pot, a process of liquefying Pt, Ti and In by heating the pot, a process of pouring the liquefied Pt, Ti and In into a mold and a process of cooling Pt, Ti and In after the process of pouring into the mold.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a decorative alloy used for a decorative article, a method for producing the decorative alloy, and a decorative article manufactured using the decorative alloy.

  Pt (platinum) alloys are often used for luxury ornaments such as rings, necklaces, earrings, pendants, brooches and watch bands. Patent Document 1 discloses an alloy for decorative articles containing 95% by weight of Pt and 5% by weight or less of Pd, Cu, and Au. Patent Document 2 discloses a decorative alloy containing 99.0% by weight or more of Pt and less than 1.0% by weight of Pd and B.

JP 2001-335863 A JP 2009-221536 A

  As a decorative item, a high-purity precious metal is preferred. For example, an alloy containing 99.9% by weight or more of Pt has a high commercial value because a hole mark <999> Pt, which proves high quality, is attached from the Mint. However, while Pt999 is excellent in purity and strength, its strength and hardness are low, and when used in a decorative article, it is weak to deformation and easily damaged. Therefore, it has been difficult to make the purity of Pt 99.9% or more in the conventional decorative alloy.

  Therefore, the present invention has been made in view of these points, and an object thereof is to provide a Pt alloy having high purity and high strength or hardness.

  In the first aspect of the present invention, there is provided a decorative alloy containing 99.90 wt% or more and 99.95 wt% or less of Pt, and 0.05 wt% or more and 0.10 wt% or less of Ti and In. provide. Ti is, for example, titanium defined by Japanese Industrial Standard JIS H4600 TP340.

  In the above-described alloy for decorative articles, the wt% of In may be larger than the wt% of Ti. For example, the weight percentage of In is 1.5 times or more of the weight percentage of Ti.

  The decorative alloy may have 99.90% by weight or more and 99.92% by weight or less of Pt. The decorative alloy has 99.92% by weight of Pt, 0.01% to 0.03% by weight of Ti, and 0.05% to 0.07% by weight of In. May be. The decorative alloy has, for example, 99.92% by weight Pt, 0.02% Ti, and 0.06% by weight In.

  In the second aspect of the present invention, a container containing 99.90% to 99.95% Pt and 0.05% to 0.10% by weight of Ti and In, the main component of which is Cu. A step of heating the Pt, Ti and In, and a step of stirring the Pt, Ti and In partially liquefied in the vessel, and a step of stirring. And a step of cooling the Pt, the Ti, and the In.

  The method for producing a decorative alloy may further include a step of evacuating the melting furnace in which the container is accommodated, and a step of filling the evacuated melting furnace with argon gas.

  In a third aspect of the present invention, there is provided a decorative article including the above-described decorative alloy.

  According to the present invention, it is possible to provide a Pt alloy having high purity and high strength or hardness.

It is a figure which shows the method of manufacturing the alloy which concerns on this embodiment. It is a figure which shows the method of manufacturing an ornament.

  The inventor of the present invention needs an alloy containing 99.90 wt% or more and 99.95 wt% or less of Pt and 0.05 wt% or more and 0.10 wt% or less of Ti and In as an ornament. It has been found that it has excellent strength or hardness. An alloy containing 99.9% by weight or more of Pt is considered to be a high-grade metal to which the hole mark <999> Pt is attached by the Mint. Therefore, an alloy containing 99.90% by weight or more and less than 99.95% Pt and 0.05% by weight or more and 0.10% by weight or less of Ti and In has high strength and hardness at the same time. And is suitable as an alloy for decorative articles. In addition, “0.05 wt% or more and 0.10 wt% or less of Ti and In” means that the total value of Ti wt% and In wt% is 0.05 wt% or more and 0.10 wt% or less. Means. Therefore, for example, an alloy containing 0.04 wt% Ti and 0.04 wt% In may be used.

FIG. 1 is a diagram showing a method for producing an alloy according to this embodiment.
First, 99.90 wt% or more and 99.95 wt% or less of Pt, and 0.05 wt% or more and 0.10 wt% or less of Ti and In are accommodated in a container mainly composed of Cu in a melting furnace. The container is, for example, a crucible or a mold (water-cooled copper) (S1). When a ceramic or graphite crucible is used, it is not preferable because a chemical reaction occurs, and it is preferable to use a copper crucible. Moreover, as a melting furnace, it is preferable to use an arc melting furnace that can maintain a higher temperature (for example, 3000 ° C.) than a high-frequency melting furnace and is suitable for a copper mold. Note that another type of furnace such as a plasma furnace may be used as the melting furnace.

  Subsequently, in order to prevent Ti from being oxidized, the melting furnace is evacuated and then filled with argon gas (S2). Next, a part of Pt, Ti, and In is liquefied by irradiating Pt, Ti, and In with an arc (S3). Subsequently, in order to dissolve undissolved Pt, Ti and In in the vicinity of the mold, the partially melted Pt, Ti and In are stirred and dissolved with the dissolved Pt, Ti and In. Invert Pt, Ti and In which are not present (S4). Thus, by inverting Pt, Ti, and In in the mold, all Pt, Ti, and In can be dissolved by irradiating the undissolved Pt, Ti, and In with an arc. Steps S3 and S4 are repeated until all Pt, Ti and In are completely liquefied.

  When all the Pt, Ti and In are completely liquefied (Yes in S5), an alloy is manufactured by cooling Pt, Ti and In in the mold (S6). By removing the alloy from the mold, the decorative article bullion is completed (S7).

  For example, in the case of producing 100 g of a decorative ingot, a seed ingot is produced from 0.95 g or less of Pt, 0.05 g or more and 0.10 g of Ti and In by the above steps (S1 to S7). Thereafter, 99 g of Pt may be added to the seed ingot and the ornamental ingot may be manufactured in a high frequency melting furnace or the like. Once the seed bullion has been manufactured, no chemical reaction will occur even if a ceramic crucible or a graphite crucible is used.

FIG. 2 is a diagram showing a method for manufacturing a decorative article.
First, a crucible containing an alloy containing 99.90% by weight or more and 99.95% or less of Pt and 0.05% by weight or more and 0.10% by weight or less of an alloy containing Ti and In is cast so that the decorative product mold comes into contact with each other. It is set at a predetermined location on the rotary arm in the machine (S11). Subsequently, the casting machine is evacuated and then filled with argon gas (S12).

  Next, after heating the casting machine and reaching the target temperature, the rotary arm is rotated (S13). Due to the centrifugal force generated by rotating the arm, the molten Pt alloy in the crucible is evenly distributed evenly in the decorative mold of the complicated shape, and bubbles are prevented from being generated in the decorative mold. be able to.

Subsequently, the decorative article mold filled with the alloy is cooled (S14). As a cooling method, a cooling method by immersing the decorative article mold in the water of the water tank is desirable.
After cooling, the decorative mold is broken, and a decorative casting made of an alloy containing 99.90 wt% or more and 99.95 wt% or less of Pt and 0.05 wt% or more and 0.10 wt% or less of Ti and In Remove from the decorative mold (S15). If a plurality of decorative article castings can be produced with one decorative article mold, the individual decorative articles are separated from the extracted decorative article casting (S16).

  In the above description, after putting Pt, Ti and In into the crucible, the melting furnace is filled with argon gas. However, the process of filling the melting furnace with argon gas is performed using Pt, Ti and In. You may do this before putting it in the crucible.

The manufacturing method of the decorative article mold is as follows.
When the design image of the ornament is completed, digital information of a three-dimensional stereoscopic image is created using a three-dimensional CAD based on the design image. Thereafter, the created digital information is set in a three-dimensional molding machine, and a master mold is created by the three-dimensional molding machine. Next, according to the same process as FIG. 2, a silver master is manufactured based on the original mold using silver as a main raw material. The original material may be another metal.

  The reason for creating the prototype is as follows. First, it is for preventing that the shape ornament slightly different from the designed shape is made by manufacturing the ornament directly from the non-metallic original mold. In addition, by creating a prototype, it is not necessary to operate a 3D modeling machine every time mass production of ornaments is performed. Furthermore, when the original mold is used in the process of creating a rubber mold, which will be described later, the original mold may be deformed. However, the original mold can be prevented from being deformed by using the original mold.

  Thereafter, a rubber mold for a decorative article is prepared using the original mold, wax is injected into the rubber mold, and the wax is solidified to form a wax-type mold. A plurality of identical wax molds may be manufactured by repeating the process of creating the wax mold.

  Next, the created wax-based mold is bonded to a wax column built on a rubber pedestal to create a wax tree. Thereafter, the wax tree is put into a stainless ring and filled with gypsum, and the gypsum is solidified.

Next, the stainless tree filled with the wax tree and the gypsum is put in a furnace and heated to melt and flow out the wax in the stenring and sinter the gypsum part.
Finally, the stenting is kept at an appropriate temperature, and a sintered decorative article concave mold is completed.

  Thus, by manufacturing the alloy which concerns on this embodiment using a casting system, it can be processed into a complicated shape rather than manufacturing an alloy using a forging system. However, the manufacturing method of the alloy which concerns on this embodiment is not limited to said casting system, You may manufacture an alloy using a forge system.

  Examples of the present invention will be described below. Table 1 shows the results of measuring the hardness of an alloy manufactured by the manufacturing method using the above casting method while changing the ratio of Pt, Ti and In.

  The strength in Table 1 was measured using a compression tester (model name: RTC-1310 manufactured by Orientec Co., Ltd.). The strength is set when the alloy specimen is set in a load meter of a tensile tester, the load when the displacement in the length direction of the alloy increases by 10% (kgf) and the load when the displacement increases by 20% (Kgf). It shows that intensity is so large that a numerical value is large. Note that a ring-shaped alloy having a width of 2.8 mm, a thickness of 1.7 mm, and an inner diameter of 17.5 mm was used as a test piece.

  The hardness in Table 1 is a low test force Vickers hardness test (hardness symbol HV0.3, test force 2.) specified by JIS Z 2244 using a micro hardness tester (model name: MVK manufactured by Akashi Co., Ltd.). 942N). As a test piece, a rectangular parallelepiped alloy having a length of 4 mm, a width of 4 mm, and a thickness of 3 mm was used.

[Analysis 1]
Comparing the results of Examples 1 to 10 with Comparative Examples 1 and 2, it can be seen that the strength of each of Examples 1 to 10 is greater than that of Comparative Examples 1 and 2. From this, the superiority of the alloy containing 99.90 wt% or more and 99.95 wt% or less of Pt and 0.05 wt% or more and 0.10 wt% or less of Ti and In was confirmed.

[Analysis 2]
Comparing the results of Examples 1 to 5 and Example 10 with Comparative Examples 1 to 3, it can be seen that in all of Examples 1 to 5, the hardness is higher than that of Comparative Examples 1 to 3. From this, it was confirmed that the weight percentage of In is preferably larger than the weight percentage of Ti. It was also confirmed that the weight percentage of In is preferably 1.5 times or more of the weight percentage of Ti.

[Analysis 3]
Comparing the results of Examples 1 to 5 with Comparative Examples 1 and 2, it can be seen that in all of Examples 1 to 5, both strength and hardness are larger than those of Comparative Examples 1 and 2. From this, it was confirmed that Pt is 99.90 wt% or more and 99.92 wt% or less, and that the wt% of In is preferably larger than the wt% of Ti.

[Analysis 4]
Comparing the results of Examples 3 to 5 with Comparative Examples 1 to 3, it can be seen that in all of Examples 3 to 5, both strength and hardness are larger than those of Comparative Examples 1 to 3. From this, it was confirmed that Pt is 99.92% by weight, and that the weight percentage of In is preferably larger than the weight percentage of Ti.

  Specifically, an alloy composed of 99.92 wt% Pt, 0.01 wt% Ti, 0.07 wt% In, 99.92 wt% Pt, 0.02 wt% Ti, Alloys composed of 0.06% by weight of In and 99.92% by weight of Pt, 0.03% by weight of Ti, and 0.05% by weight of In are suitable for decorative products. And having a hardness. Among these, it can be seen that an alloy composed of 99.92% by weight of Pt, 0.02% by weight of Ti, and 0.06% by weight of In is particularly excellent in terms of balance between strength and hardness.

  From the above points, it can be seen that the decorative articles including the alloys made of Pt, Ti, and In shown in Examples 1 to 10 have high purity and strength and hardness that are not easily damaged.

[Effect in this embodiment]
As described above, the decorative alloy including 99.90 wt% or more and 99.95 wt% or less of Pt and 0.05 wt% or more and 0.10 wt% or less of Ti and In according to the present embodiment. (1) High strength and excellent deformation resistance, (2) High hardness and excellent wear resistance, scratching of the metal surface is difficult, and (3) Pt purity is high. Therefore, by using this alloy, it is possible to provide a high-quality ornament.

  In addition, according to the method for manufacturing a decorative alloy according to the present embodiment, 99.90% by weight or more and 99.95% or less of Pt by using a casting method generally used in the jewelry industry, 0.05 It is possible to produce an alloy suitable for a decorative product having a high design in a complicated shape without causing an unnecessary chemical reaction for a decorative alloy containing Ti and In of not less than 0.10% by weight and not more than 0.10% by weight. it can.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

Claims (9)

  An alloy for decorative articles, comprising 99.90% to 99.95% Pt and 0.05% to 0.10% Ti and In. In wt% is greater than Ti wt%,
The alloy for decorative articles according to claim 1. The weight percentage of In is 1.5 times or more of the weight percentage of Ti,
The alloy for decorative articles according to claim 2. 99.90 wt% or more and 99.92 wt% or less of Pt,
The alloy for decorative articles according to any one of claims 1 to 3. 99.92 wt% Pt, 0.01 wt% or more and 0.03 wt% or less of Ti, and 0.05 wt% or more and 0.07 wt% or less of In,
The alloy for decorative articles according to claim 4. 99.92 wt% Pt, 0.02 wt Ti, and 0.06 wt% In,
The alloy for decorative articles according to claim 5. Placing 99.90 wt% or more and 99.95 wt% or less of Pt and 0.05 wt% or more and 0.10 wt% or less of Ti and In into a container containing Cu as a main component;
Heating and liquefying the Pt, Ti and In;
A step of stirring the partially liquefied Pt, Ti and In in the container;
Cooling the Pt, Ti and In after the stirring step;
A method for producing a decorative alloy having Vacuuming the melting furnace in which the vessel is housed;
Filling a vacuum melting furnace with argon gas;
Further having
The manufacturing method of the alloy for decorative articles of Claim 7.   A decorative article comprising the decorative alloy according to any one of claims 1 to 6.

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