JPH04202608A - Manufacture of noble metal porous body - Google Patents

Abstract

PURPOSE:To manufacture a noble metal porous body suitable as personal ornaments or decorations by wraping up a soluble core with granular noble metal, subjecting it to compacting into a prescribed shape, thereafter dissolving away the core and executing sintering. CONSTITUTION:A core 1 is made by water soluble substance such as sugar and salt and is set in a mold 2, and the powder S of noble metal such as gold is filled around its circumference. This powder is pressurized by a mold and is compacted to form a porous formed green compact 3. This porous green compact 3 is immersed in hot water, and the core 1 is dissolved away by infiltrating the hot water from many pores therein and is discharged to the outside of the green compact via the many pores. Next, this is taken out from the hot water bath and is dried to make a green compact 5 having a hollow part corresponding to the core at the inside, which is sintered in a vacuum furnace or a nonoxidizing furnace. The porous material having high capacity and suitable for noble metal personal ornaments or the like is obtd. by a material having a hollow inside and contg. small amounts of noble metal having light weight.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for producing a porous body made of a noble metal or an alloy of noble metals.

``Prior Art'' In general, jewelry such as pentads and brooches, or ornaments such as ornaments, are formed into a predetermined shape by casting or forging precious metals or alloys of precious metals. Manufactured through appropriate processing.

By the way, the jewelry manufactured as described above is in the form of a block with a dense interior, and the precious metal or alloy of precious metal used as the material is usually a block. Even relatively small items are expensive.

Moreover, ornaments such as ornaments are of course expensive for the same reasons as jewelry, and if they are relatively large, they can be quite heavy due to the high specific gravity of precious metals.

Object of the Invention-1 This invention was made against the above background, and provides a porous precious metal body suitable for jewelry and ornaments, which is made of a material made of a powdery, granular, or thin wire-like precious metal or an alloy of precious metals. The purpose is to provide a manufacturing method for.

Means for Solving a Problem - In order to achieve the above object, a method for manufacturing a noble metal porous body according to claim 1 of the present invention provides a method for producing a porous body of a noble metal, which is a powdery, granular, or thin wire-like material made of a noble metal or an alloy of a noble metal. is compression-molded into a predetermined shape so as to enclose a soluble core to form a porous molded body, the core is then melted and removed from the molded body, and then this molded body is sintered. It is something that connects.

The method for producing a porous noble metal body according to claim 2 is a method of producing a porous body by compression molding a powdery, granular, or fine wire material made of a noble metal or an alloy of noble metals into a predetermined shape so as to enclose a soluble core. A green compact is formed, the compact is then sintered, and the core is then melted and removed from the sintered compact.

The method for producing a noble metal porous body according to claim 3 is performed by compression molding a powdered, granular, or fine wire-like material made of a noble metal or an alloy of noble metals into a predetermined shape so as to enclose a resin core. A porous molded body is formed, and at the same time as this molded body is sintered, the core is vaporized or melted and removed.

The method for producing a noble metal porous body according to claim 4 is to compression mold a powdered, granular, or thin wire-like material made of a noble metal or an alloy of noble metals into a predetermined shape by embedding soluble granules on the surface. A molded body is formed, then the granules are melted and removed from the molded body, and then this molded body is sintered.

A method for manufacturing a porous noble metal body according to claim 5 is to compression mold a powdery, granular, or thin wire-like material made of a noble metal or an alloy of noble metals into a predetermined shape by embedding soluble granules on the surface. A molded body is formed, then this molded body is sintered, and then the grain core is melted and removed from the sintered body.

The method for manufacturing a porous noble metal body according to claim 6 is to compression mold a powdery, granular, or thin wire-like material made of a noble metal or an alloy of noble metals into a predetermined shape by embedding resin particles on the surface. As a result, a porous molded body is formed, and at the same time as this molded body is sintered, the granules are vaporized or melted and removed.

"Function" In the method for producing a porous noble metal body according to claims 1 and 2, a porous molded body is formed in a state in which a soluble core is enclosed, and the molded body is sintered before or after sintering. Since the core is melted and removed in the process, it is possible to easily form a hollow porous body, and since the produced porous body is hollow inside, it is small in weight and small. Since it is possible to obtain a large volume with the material, it is possible to provide relatively inexpensive accessories and ornaments using precious metals.

In the method for producing a porous noble metal body according to claim 3, in addition to the effects of the methods according to claims 1 and 2, the molded body is sintered and at the same time a resin core is melted or vaporized. Since the porous body is formed by removing the core from the sintered body, there is an advantage that the process of removing the core before and after sintering can be omitted.

In the method for producing a porous body according to claims 4 and 5, after forming a molded body by embedding the soluble granules on the surface, the granules are formed before or after sintering the molded body. Since the porous material is removed by melting it, fine recesses can be easily formed on the surface of the porous material, giving it a decorative appearance with a so-called satin texture.

According to the method for manufacturing a porous body according to claim 6, the resin particles are removed from the sintered body by melting or vaporizing them at the same time as the molded body is sintered to form the porous body. Therefore, in addition to the effects of claims 4 and 5, there is an advantage that the step of removing grains before and after sintering can be omitted.

Furthermore, since the porous body manufactured by any of the manufacturing methods of claims 4 to 6 above has a smaller weight than a normal block-like body, it can be used as a relatively inexpensive accessory or decoration using precious metals or alloys of precious metals. can provide goods.

One Example” Hereinafter, an example of the method for producing a noble metal porous body of the present invention will be described with reference to the drawings.

(Embodiment corresponding to claim 1) FIGS. 1 to 3 are diagrams showing a first embodiment. First, the core 1 is formed by hardening sugar or salt into a predetermined shape. This core 1 is soluble and can be easily dissolved in water, hot water, etc., for example.

Next, as shown in FIG. 1, this core is placed in a mold 2, and the mold 2 is filled with gold (18K) powder S. In this state, the core l is surrounded by the powder S.

Next, a compressive force is applied to the mold 2 using a press device to compress and mold the powder S to form a porous molded body 3. The compression pressure at this time was 100 Kg/ax'.

Next, as shown in FIG. 2, this molded body 3 is immersed in a hot water bath. Then, the hot water permeates into the molded body 3 through the many holes, melts the core 1, and flows out through the many holes.

Next, the molded body 3 is taken out from the hot water bath and dried. In this way, a porous molded body 3 having a hollow interior is produced.

After that, this molded body 3 is sintered. A vacuum furnace, H1 furnace, Ar-N furnace, etc. is used for this sintering, and the sintering conditions are such that the temperature is maintained at 800° C. for about 3 hours.

As shown in Fig. 3, the sintered body manufactured in this way is a porous body 5 having many small pores, and is hollow inside, so it is light in weight and large with less material. Since it is possible to obtain volume, it is suitable for accessories and decorations.

Further, since the core 1 is formed from soluble sugar or common salt, the core 1 can be easily removed from the molded body 3 by immersing the molded body 3 in a hot water bath or the like to dissolve the core 1.

Furthermore, in the above manufacturing method, since the material is made of gold powder and the inside is hollow, the cost of the manufactured porous body 5 can be kept lower than that of a normal block-like body.

Although sugar or common salt was used as the raw material for the core 1 in the above embodiments, water-soluble resins such as methylcellulose may also be used.

In addition, if ceramic, camphorax, etc. that does not dissolve in water or the like and does not dissolve during sintering is placed inside the core l, this ceramic will remain inside the porous body 5 and the surface of the porous body 5 will be You can see the color of the ceramic and camphor inside through the golden gaps, which can further improve the decorative effect.

(Embodiment corresponding to claim 2) FIGS. 4 and 5 are diagrams showing a second embodiment. First, a core 6 of a predetermined shape is made of soluble ceramic such as SiC2.
form. This core 6 is designed to be dissolved in an alkaline solution such as KOHlNaOH.

Next, in the same manner as shown in FIG. 1, this core 6 is placed in a mold, and gold (24K) is placed in this mold.
The material is filled with finely cut thin wire. Here, when the material is introduced into the mold, since the material has a shape extending in the longitudinal direction, it is sequentially stacked approximately parallel to the bottom surface of the mold and is surrounded by the material from the core 6. .

Next, the powder is compression-molded by applying compression force to the mold using a press device to form a porous molded body 7 as shown in FIG.
form. The compression pressure at this time is 50 Kg/Off
'is.

Next, the bottom of this molded body is sintered to obtain a porous sintered body 8. A vacuum furnace, N7 furnace, Ar-N furnace, etc. is used for this sintering, and the sintering conditions are such that the sintering temperature is maintained at 1050'c for about 5 hours.

Thereafter, as shown in FIG.
Alternatively, soak it in an alkaline aqueous solution of NaOH. Then,
The alkaline aqueous solution seeps into the molded body 8 through the many pores, melts the core 6, and applies fluid pressure to the outside through the many pores. Note that the concentration of the aqueous alkali solution is 30 to 40% by weight.
By heating the aqueous solution to 80-100° C. and immersing the sintered body 8 for about 3 to 10 hours, the core 6 is completely dissolved and removed.

The sintered body 8 produced in this way is also a porous body having many small pores, as well as being hollow inside, so it is light in weight and small. Since a large volume can be obtained from the material, it is suitable for use as accessories.

Furthermore, since the core 6 is made of soluble ceramics (Si01), the core 6 can be easily removed from the sintered body 8 by immersing the porous sintered body 8 in an alkaline aqueous solution and melting the core 6. can.

Furthermore, in the above manufacturing method, the material is made of finely cut gold wire, and the inside is hollow, so the cost of the manufactured porous body (sintered body) 8 is reduced compared to that of a normal block. It is also possible to keep it relatively low.

(Embodiment corresponding to claim 3) The method for producing a noble metal porous body according to the third embodiment uses a resin such as polyethylene or paraffin as the core material, and molds the resin into a predetermined shape by injection molding the resin. form a child;

Then, this core is placed in a mold in the same manner as in the first and second embodiments, and the mold is filled with a large number of granular gold (18K) chips. At this time, the core is surrounded by the chip.

Next, a compressive force is applied to the mold using a press device to compress the chip and form a porous molded body. The compression pressure at this time was 150 Kg/cy'.

Next, this molded body is sintered to obtain a porous sintered body. During this sintering, the resin core is melted or vaporized and removed to the outside of the sintered body, so that the sintered body becomes hollow after sintering, thereby producing a porous body.

A vacuum furnace, N2 furnace, Ar-N2 furnace, etc. is used for this sintering, and the sintering conditions are as follows:
I try to keep it for about an hour.

Similar to the first and second embodiments, the porous body produced in this way is also a porous body having a large number of small pores, and since the inside is hollow, it is light in weight and requires less material. Since a large volume can be obtained with
It is suitable as an accessory or the like.

In addition, since the core is made of resin, it can be easily removed from the porous body by melting or vaporizing it at the same time as sintering, and it can be easily removed from the porous body as in the first and second embodiments. , there is an advantage that the core removal process before and after sintering can be omitted.

Furthermore, the above manufacturing method produces fine chips of gold.

Since the porous body (sintered body) 8 is made of porous material and is hollow inside, the cost of the manufactured porous body (sintered body) 8 can be kept lower than that of a normal block-like body.

(Embodiment corresponding to claim 4) FIGS. 6 and 7 illustrate a fourth embodiment. First, sugar or salt is granulated to form a large number of granules. This granule is soluble and can be easily dissolved in water, hot water, etc., for example.

Next, the particles are placed on the inner surface of the mold, and then gold (18K) powder is filled into the mold. As a result, the granules are located near the boundary between the powder and the mold.

Next, a compressive force is applied to the mold using a press device to compression mold the powder to form a porous molded body 9 as shown in FIG. At this time, the granules 10 are compressed into a molded body 9.
embedded in the surface.

Next, this molded body 9 is immersed in a hot water bath. Then, the hot water dissolves the granules 10 embedded in the surface of the molded body 9, whereby the granules 10 are removed from the molded body 9 and a large number of fine recesses are formed on the surface of the molded body 9.

Next, after taking out the molded body 9 from the hot water bath and drying it,
This molded body 9 is sintered. For this sintering, a vacuum furnace, H7
A furnace, an Ar-N furnace, or the like is used, and the sintering conditions are such that the sintering temperature is maintained at 830'C for 2 hours.

The thus produced sintered body 1 is a porous body having a large number of recesses 12 on its surface, as shown in FIG. Since it weighs less than ordinary lumps, it is suitable for use as accessories and decorations, and costs can be kept low.Furthermore, since it has fine recesses on its surface, it has an appearance similar to that of a so-called pear. It can provide a texture-like decorative feel.

Further, since the granules 10 are formed from soluble sugar or common salt, the granules 10 can be easily removed from the molded body 9 by immersing the molded body 9 in a hot water bath or the like to dissolve the granules 10.

(Embodiment corresponding to claim 5) The method for producing a noble metal porous body according to the fifth embodiment is as follows:
Form a large number of particles using soluble ceramics such as 02. These particles become soluble in an alkaline solution such as KOH or NaOH.

Next, the above particles are placed on the inner surface of the mold, and a fine wire of gold (18K) is cut finely into the mold on a t-coat, and the material powder is filled. As a result, the particles are located near the boundary between the material and the mold.

Next, a compression force is applied to the mold using a press device to compression mold the powder to form a porous molded body. At this time, the granules are embedded in the surface of the molded body by compression.

Next, a compression force is applied to the mold using a press device to compression mold the powder to form a porous molded body. At this time,
The granules are embedded in the surface of the molded body by compression. The compression pressure was 180 Kg/cy'.

Next, this molded body is sintered to obtain a porous sintered body. A vacuum furnace, H6 furnace, Ar/N furnace, etc. is used for this sintering, and the sintering conditions are such that the sintering temperature is maintained at 1050° C. for 5 hours.

Thereafter, the sintered body is immersed in an alkaline aqueous solution of KOHl or NaOH. Then, the alkaline aqueous solution dissolves the particles embedded in the surface of the sintered body and removes them from the sintered body, forming many fine recesses on the surface of the sintered body. The a degree of the alkaline aqueous solution is approximately 30 to 40% by weight, and the particles are completely removed by heating the aqueous solution to a temperature of 80 to 100°C and immersing the sintered body 8 for approximately 3 to 10 hours. Dissolve and remove.

The sintered body produced in this way is also a porous body with many recesses on its surface, and is lighter in weight than ordinary block-like bodies, making it suitable for use as accessories and decorations, and at a low cost. Moreover, since the surface has fine recesses, it can give a so-called satin-like decorative feel even when removed.

Furthermore, since the grains are made of soluble SiC2, the grains can be easily removed from the sintered body by immersing the sintered body in an alkaline aqueous solution to dissolve the grains.

(Embodiment corresponding to claim 6) The method for producing a noble metal porous body according to the sixth embodiment uses a resin such as polyethylene or paraffin as the material of the granules, and the granules are used as described in the fourth and fifth embodiments. In the same manner as above, a large number of gold particles (18
Fill with K) chips.

Next, a compressive force is applied to the mold using a press device to compress the chip and form a porous molded body. At this time, the granules are embedded in the surface of the molded body by compression. Note that the compression pressure is 130 Kg/cx'.

Next, this molded body is sintered to obtain a porous sintered body. During this sintering, the resin particles are melted or vaporized and removed from the sintered body, so that many fine recesses are formed on the surface of the sintered body after sintering.

A vacuum furnace, H7 furnace, Ar-N furnace, etc. is used for this sintering, and the sintering conditions are such that the temperature is maintained at 850° C. for about 5 hours.

The sintered body produced in this way is also a porous body with many recesses on its surface, and is lighter in weight than ordinary block-like bodies, making it suitable for use as accessories and decorations, and at low cost. (It can be suppressed, and since it has fine recesses on the surface, it can also give a so-called satin-like decorative appearance.

Furthermore, since the granules are made of resin, they can be easily removed from the porosity by melting or vaporizing them at the same time as sintering, and as in the fourth and fifth embodiments, There is an advantage in that the step of removing particles before and after sintering can be omitted.

In each of the above embodiments, gold is used as the material for the porous body, but the porous body may also be manufactured using platinum, silver, or an alloy thereof.

``Effects of the Invention - Below'' - As explained, according to the method for producing a porous body according to claim 1 of the present invention, after the soluble core is melted and removed from the molded body, the molded body is sintered. Since the porous body is produced by connecting the porous bodies with the same material, it is possible to easily produce a hollow porous body, and since the produced porous body is hollow inside, it is small in weight and small in weight. Since a large volume can be obtained with the material, suitable jewelry and ornaments made of precious metals can be provided.

According to the method for producing a porous body according to claim 2, the porous body is produced by sintering the molded body provided inside the soluble core, and then melting the core and removing it from the sintered body. This makes it possible to easily produce a hollow porous body, and since the produced porous body is hollow inside, it has a small weight and a large volume can be obtained with a small amount of material. Therefore, it is possible to provide suitable jewelry and ornaments made of precious metals.

According to the porous manufacturing method of claim 3, the molded body provided inside the resin core is sintered and at the same time melted or vaporized, thereby removing it from the sintered body and molding the porous body. Therefore, it is possible to obtain the same effects as in claims 1 and 2 above, and there is an advantage that the step of removing the core before and after sintering can be omitted.

In addition, since the porous body manufactured by any of the manufacturing methods of Claims 1 to 3 is hollow inside, it is smaller in weight and can have a larger volume with less material than a normal block. Since precious metals or alloys of precious metals can be obtained, it is possible to provide relatively inexpensive accessories and ornaments using precious metals or alloys of precious metals.

According to the method for manufacturing a porous body according to claim 4, a molded body is formed by embedding soluble particles on the surface,
The granules are then melted and removed from the molded body, and the molded body is then sintered to produce a porous body, so fine recesses can be easily formed on the surface of the porous body. , it is possible to exhibit a so-called satin-like decorative appearance.

According to the method for producing a porous body according to claim 5, a molded body is formed by embedding soluble grains on the surface, and then the molded body is sintered, and the grains on the surface of the sintered body are sintered. Since the porous body is manufactured by melting and removing the sintered body from the sintered body, fine recesses can be easily formed on the surface of the porous body to create a decorative wall with a so-called satin texture. I can do it.

According to the method for manufacturing a porous body according to claim 6, the resin particles are removed from the sintered body by melting or vaporizing them at the same time as the molded body is sintered to form the porous body. Therefore, it is possible to obtain the same effects as in claims 4 and 5 above, and there is an advantage that the step of removing grains before and after sintering can be omitted.

Furthermore, since the porous body manufactured by any of the manufacturing methods of claims 4 to 6 above has a smaller weight than a normal block-like body, it can be used as a relatively inexpensive accessory or decoration using precious metals or alloys of precious metals. can provide products.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 7 illustrate an embodiment of the method for producing a noble metal porous body of the present invention. Figures 1 to 3 show the first embodiment, with Figure 1 being a sectional view showing the molded body being compression molded, Figure 2 being a sectional view showing the core being melted, and Figure 2 being a sectional view showing the state in which the core is being melted. Figure 3 is a sectional view of the porous body, Figures 4 and 5 show the second embodiment, Figure 4 is a sectional view of the molded body, and Figure 5 is a sectional view showing the state in which the core is melted. , FIG. 6 and FIG. 7 show a fourth embodiment, in which FIG. 6 is a cross-sectional view of the molded body, and FIG. 7 is a cross-sectional view of the porous body. 1.6 Core, 3, 7.9 Molded body, 5 Porous body, 8 Sintered body (porous body), ]O-granule, 11
...Sintered body (porous body).

Claims (6)

[Claims] (1) A porous compact is formed by compression molding a powdered, granular, or fine wire material made of a noble metal or an alloy of noble metals into a predetermined shape so as to enclose a soluble core, and then A method for producing a noble metal porous body, comprising melting the core and removing it from the molded body, and then sintering the molded body. (2) A porous compact is formed by compression molding a powdered, granular, or fine wire material made of a noble metal or an alloy of noble metals into a predetermined shape so as to enclose a soluble core, and then A method for manufacturing a noble metal porous body, which comprises sintering this molded body, and then melting the core and removing it from the sintered body. (3) Forming a porous molded body by compression molding a powdered, granular, or fine wire material made of a noble metal or an alloy of precious metals into a predetermined shape so as to enclose a resin core; A method for producing a noble metal porous body, which comprises sintering the molded body and simultaneously vaporizing or melting and removing the core. (4) Form a compact by compression molding a powdered, granular, or fine wire material made of a noble metal or an alloy of noble metals into a predetermined shape by embedding soluble granules on the surface; 1. A method for producing a porous noble metal body, which comprises melting and removing from a molded body, and then sintering the molded body. (5) Form a compact by compression molding a powdered, granular, or fine wire material made of a noble metal or an alloy of noble metals into a predetermined shape with soluble granules embedded in the surface, and then form a compact. 1. A method for producing a porous noble metal body, which comprises sintering a granular core, and then melting and removing the granular core from the sintered body. (6) A porous molded body is formed by compression molding a powdered, granular, or fine wire material made of a precious metal or alloy of precious metals into a predetermined shape with resin particles embedded in the surface. A method for producing a noble metal porous body, characterized in that the granules are removed by vaporization or melting at the same time as the compact is sintered.