JPH05171225A - Noble metal plastic composition containing different noble metal pieces and calcined body - Google Patents

Abstract

PURPOSE:To obtain the noble metal plastic compsn. adequate for the manufacture of multicolor noble metal ornaments by mixing different noble metal pieces consisting of a noble metal different from the noble metal of the plastic compsn. consisting of the noble metal powder and a binder with this plastic compsn. CONSTITUTION:The different noble metal pieces 1 (for example, Pt alloy, etc.) consisting of the noble metal different from the noble metal of the noble metal plastic compsn. 2 and having the volume larger than the volume of above- mentioned noble metal compsn mixed with the above-mentioned noble metal plastic compsn. consisting of the noble metal powder (for example, Au powder, etc., having about <=50mu average grain size) and the binder. The adequate compsn. of the binder is constituted of water-soluble binders of a cellulose system (methyl cellulose, etc.), surfactants (alkyl benzene sulfonate, etc.), fats and oils (phthalic acid-di-2-ethyl hexyl, etc.) or alcohols (polyvinyl alcohol, etc.) and water. The above-mentioned mixture is then molded to a prescribed shape and is calcined, by which the multicolor ornaments dispersed with the parts consisting of the different noble metal pieces 1 in the substrate parts 3 consisting of the noble metal powder are obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic composition containing different kinds of precious metal pieces, which can be suitably used for producing multicolor precious metal ornaments, and a fired body thereof.

[0002]

2. Description of the Related Art As a noble metal ornament, for example, a multicolor ornament having a pattern of platinum particles 12 on a base portion 11 made of gold as shown in FIG. 3 is provided. In such a conventional multicolored ornament, as shown in FIG. 4, gold particles 13 and platinum particles 12 are mixed and filled in a stainless steel container 15, which is then hot isostatically pressed to gold particles. It was manufactured by solid-phase joining 13 and platinum particles 12.

[0003]

However, there are the following problems in manufacturing the multicolored ornaments as described above. Gold particles 13 and platinum particles 1 in stainless steel container 15
The work of filling and sealing 2 is complicated. After the hot isostatic pressing, it takes time to remove the molded product from the stainless steel container 15. The stainless steel container 15 is easily damaged during hot isostatic pressing. It is difficult to place the platinum particles 12 in a predetermined position,
I can't get the desired design. The shape of the resulting multicolored ornament is a stainless steel container 1.
Since the shape is limited to 5, the complicated shape cannot be obtained. The present invention has been made in view of the above circumstances, and an object thereof is to provide a noble metal plastic composition containing different kinds of noble metal pieces and a fired body capable of producing a multicolor ornament without using a hot isostatic pressing method. To do.

[0004]

According to a first aspect of the present invention, there is provided a noble metal plastic composition containing a different noble metal piece, wherein a noble metal plastic composition comprising a noble metal powder and a binder is mixed with a different noble metal piece made of a noble metal different from the noble metal. It was done. The fired body according to claim 2 is characterized in that, in the fired body of a noble metal plastic composition comprising a noble metal powder and a binder, different noble metal pieces made of a noble metal different from the noble metal are arranged. is there.

The noble metal flexible composition will now be described. The preferred composition of the noble metal flexible composition is as follows. Noble metal powder: 50 to 98.5% by weight Binder: 1.5 to 50% by weight The preferred composition of the binder is as follows. However, the compounding ratio of this binder is shown as 100% by weight of the entire obtained noble metal flexible composition. Cellulosic water-soluble binder: 0.4 to 16.5% by weight Surfactant: 0.001 to 8.5% by weight Oil or fat: 1.2 to 25% by weight Water and inevitable impurities: balance

Next, specific examples of each of the above components and the reasons for limiting the compounding ratio will be described. (A) Noble metal powder As the noble metal powder, spherical particles having an average particle size of 50 μm or less,
Irregular or flat powders can be used. The noble metal forming the noble metal powder includes Pt, Ru, Rh, Pd, Ir,
One or more selected from the group consisting of platinum group such as Os and Au, Ag and alloys containing these are used. This noble metal powder is a main component constituting the noble metal flexible composition and is an important factor for determining the color tone of the product, but if the content is less than the above range, the color becomes unclear, and If it exceeds the range, the elongation and strength of the obtained noble metal flexible composition are deteriorated, which is not preferable.

(B) Cellulose Water-Soluble Binder Cellulose water-soluble binder is methyl cellulose,
It is a product obtained by dissolving ethyl cellulose or the like in water and maintains the shape of the precious metal flexible composition well. If the addition amount of the cellulose-based water-soluble binder is less than the above range, the effect as a binder cannot be obtained, and if it is more than the above range, the viscosity of the noble metal plastic composition becomes too large, which makes molding difficult.

(C) Surfactant The surfactant enhances the affinity between the noble metal powder and the cellulose-based water-soluble binder and facilitates the mixing of the two. If the addition amount of the surfactant is less than the above range, its effect is weak, and if it is more than the above range, the viscosity of the obtained flexible composition is lowered and the fluidity is increased, which makes it impossible to form a structure, which is not preferable. .. As the surfactant, for example, anionic surfactants such as alkylbenzene sulfonate and fatty acid soap are preferably used.

(D) Oils and Fats or Oils Oils or alcohols are added in a small amount to impart lubricity to the flexible composition and improve slippage between the noble metal powder and the cellulose-based water-soluble binder. It enhances the formability. If the addition amount of the oil is less than the above range, the effect cannot be obtained, and if it is more than the above range, the obtained flexible composition becomes oily and slippery, and the workability at the time of molding is deteriorated, which is not preferable. . Examples of oils and fats include
Phthalic acid 2-ethylhexyl, phthalic acid n
Higher organic acid esters such as -octyl, n-dibutyl phthalate, -n-octyl phthalate, isooctyl phthalate are preferably used, and examples of alcohols include higher alcohols such as polyvinyl alcohol and higher alcohols such as polyethylene glycol. A polyhydric alcohol or the like is preferably used. Further, two or more kinds of fats and oils and alcohols may be added at the same time.

The different noble metal piece is made of a noble metal different from the noble metal used in the noble metal powder forming the noble metal plastic composition. It is desirable to use the different noble metal piece having a volume larger than that of the noble metal powder. The shape of this dissimilar noble metal piece may be any shape such as a plate body or a linear body cut into a predetermined size.

The firing temperature of the noble metal plastic composition containing different noble metal pieces is preferably in the range of 600 to 1600 ° C. If necessary, before performing the main baking treatment, 60
You may perform binder removal and a temporary baking process at about 0-700 degreeC.

[0012]

Since the noble metal plastic composition containing different noble metal pieces according to claim 1 is a mixture of a noble metal plastic composition comprising a noble metal powder and a binder with different noble metal pieces, the composition itself is appropriately shaped. Baking removes the binder,
The noble metal powders and the noble metal powders and the dissimilar noble metal pieces are sintered to obtain a multicolored decorative article in which the base portion made of the noble metal powder is provided with a different color pattern made of the dissimilar metal pieces. In the fired body according to claim 2, since the dissimilar noble metal pieces are arranged in the fired body of the noble metal plastic composition including the noble metal powder and the binder, the dissimilar noble metal pieces are dispersed in the noble metal plastic composition and sintered. By doing so, a multicolor ornament in which a pattern made of a different noble metal is applied to the base portion made of noble metal powder is obtained. Therefore, this fired body has an advantage that it can be produced without using the hot isostatic pressing method.

[0013]

EXAMPLES The noble metal plastic composition containing different kinds of noble metal pieces of the present invention and the fired body will be described below with reference to examples. A binder was prepared by mixing 9% by weight of methyl cellulose, 3% by weight of alkylbenzene sulfonate, 10% by weight of di-2-ethylhexyl phthalate and water. Next, 22 parts by weight of this binder and 78 parts by weight of gold powder were kneaded to obtain a noble metal plastic composition. As the gold powder, a granular pure gold powder having an average particle diameter of 40 μm was used. Next, a wire rod made of a platinum alloy and having a diameter of 0.3 mm is cut to a length of about 5 mm to prepare about 50 pieces of noble metal of different types, and the noble metal plastic composition 2
Mixed to 00g. This noble metal plastic composition containing different kinds of noble metal pieces was kneaded, and as shown in FIG. 1, the different kinds of noble metal pieces 1 were formed in a predetermined shape while being arranged at a desired position in the portion made of the noble metal plastic composition 2. Next, this shaped noble metal plastic composition containing different shaped noble metal pieces was fired at about 1000 ° C. for about 2 hours. The fired body thus obtained was a multicolor decorative article in which a base portion 3 formed of the noble metal plastic composition 2 was provided with a different color pattern of different kinds of noble metal pieces 1 as shown in FIG. The resulting multicolored decorative article had the base part 3 because the part made of the noble metal plastic composition 2 shrank during firing.
The portion composed of the dissimilar noble metal piece 1 was more raised than the above.

Since the noble metal plastic composition containing different noble metal pieces of this embodiment is a mixture of the noble metal plastic composition 2 including the noble metal powder and the binder, the different noble metal piece 1 including the noble metal different from the noble metal, When the composition is appropriately shaped and then fired, the binder is removed. Then, the noble metal powders and the noble metal powders and the dissimilar noble metal pieces 1 are sintered to obtain a multicolored decorative article in which the part made of the dissimilar metal pieces 1 is dispersed in the base part 3 made of the noble metal powder. Therefore, according to this noble metal plastic composition containing different kinds of precious metal pieces, a multicolored decorative article can be produced without using the hot isostatic pressing method. Therefore, the complex shape in which the different kinds of precious metal pieces 1 are arranged at a desired position,
It is easy to manufacture patterned multicolored ornaments. Further, in the fired body of this example, since the dissimilar noble metal piece 1 is disposed in the fired body of the noble metal plastic composition 2 including the noble metal powder and the binder, the noble metal plastic composition 2 is provided with the dissimilar noble metal piece 1. By dispersing and sintering, a multicolor decorative article in which the base portion 3 made of noble metal powder is provided with a pattern made of different kinds of noble metal pieces 1 is obtained. Therefore, this fired body has an advantage that it can be produced without using the hot isostatic pressing method. In the above examples, the shaped noble metal plastic composition containing dissimilar noble metal pieces was fired as it was to give a multicolored ornament, but the shaped noble metal plastic composition containing dissimilar noble metal pieces was cut and then Of course, the cross section may have the appearance of a multicolor ornament.

[0015]

The noble metal plastic composition containing different noble metal pieces according to claim 1 is a mixture of a noble metal plastic composition composed of a noble metal powder and a binder with a different noble metal piece made of a noble metal different from the noble metal. When the composition itself is appropriately shaped and then fired, the binder is removed, the precious metal powders and the precious metal powders and the dissimilar precious metal pieces are sintered, and a different color pattern composed of the dissimilar metal pieces is formed on the base portion made of the precious metal powder. A multi-colored ornament that has been applied is obtained. Therefore, according to this noble metal plastic composition containing different kinds of precious metal pieces, it is possible to manufacture multicolored ornaments without using the hot isostatic pressing method. Color ornaments can be easily manufactured. The fired body according to claim 2 is a fired body of a noble metal plastic composition composed of a noble metal powder and a binder, in which different kinds of noble metal pieces made of a noble metal different from the noble metal are arranged. By dispersing the noble metal pieces and sintering the pieces, a multicolor ornamental product in which a base part made of the noble metal powder is provided with a pattern made of different kinds of noble metals. Therefore, this fired body has an advantage that it can be produced without using the hot isostatic pressing method.

[Brief description of drawings]

FIG. 1 is a plan view showing a state where a noble metal plastic composition containing different kinds of noble metal pieces of the example is shaped.

FIG. 2 is a plan view showing a fired body manufactured in an example.

FIG. 3 is a plan view showing an example of a multicolor ornament.

FIG. 4 is a cross-sectional view showing a state in which a stainless steel container is filled with gold particles and platinum particles in order to manufacture the multicolor ornament by the hot isostatic pressing method.

[Explanation of symbols]

1 ... Dissimilar noble metal piece, 2 ... Noble metal plastic composition, 3 ...
... Base precious metal part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C22C 5/02 6919-4K

Claims (2)

[Claims] 1. A noble metal plastic composition containing different noble metal pieces, wherein a different noble metal piece made of a noble metal different from the noble metal is mixed with a noble metal plastic composition made of a noble metal powder and a binder. 2. A noble metal plastic composition containing different noble metal pieces, wherein different kinds of noble metal pieces made of a noble metal different from the noble metal are arranged in a fired body of the noble metal plastic composition comprising a noble metal powder and a binder. A fired product.