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Composition for precious metal sintering, process for producing precious metal sinter and precious metal sinter

A precious metal and composition technology, applied in the field of precious metal sintering composition, can solve the problems of shape limitation, inability to use perlite or vermiculite, and lower value of precious metal products

Inactive Publication Date: 2011-04-13
AIDA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, even if perlite or vermiculite is applied to the production of a precious metal sintered body obtained using the above-mentioned composition for precious metal sintering, it cannot be applied unless these are finely pulverized. Density may increase and precious metal sinters lose precious metal color, so perlite or vermiculite still cannot be applied in the end
[0007] Furthermore, it is not clear whether the original noble metal sintered compact can be obtained when a large amount of these lightweight filler additives is mixed to significantly reduce the noble metal content per unit volume of the composition for noble metal sintering
In addition, the addition of these lightweight fillers will reduce the color of precious metal products, or the visual (aesthetic) value of the unique color or luster of precious metals
[0008] It should be noted that in the field of manufacturing precious metals by casting, etc., the method of realizing hollowing with a mandrel (neutron) is sometimes used, but it is difficult to use a mandrel when making products with complex shapes such as ornaments
[0009] In addition, when a sintered body is obtained from the above-mentioned noble metal sintering composition, cavitation can be realized by the mandrel, but the mandrel burns during firing and burns out due to intense gas generation due to combustion, so the shape is limited.
For example, when cork is used as the mandrel and the combination part for precious metal sintering is thinly pasted (coated) on the entire surface of the cork, there is no problem as long as the article itself is small or the ventilation holes are unobstructed. In some cases, there is a problem that the force of the gas during firing causes deformation of the sintered product
[0010] When firing the noble metal sintering composition containing silver oxide powder, the silver oxide powder decomposes to generate oxygen, so a porous fired body can be obtained. The problem of product deformation

Method used

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  • Composition for precious metal sintering, process for producing precious metal sinter and precious metal sinter
  • Composition for precious metal sintering, process for producing precious metal sinter and precious metal sinter
  • Composition for precious metal sintering, process for producing precious metal sinter and precious metal sinter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] An 8% by weight organic binder solution consisting of 8.75% by weight of starch, 10% by weight of cellulose, and water of the remainder and 50% by weight (46% by weight of the whole) of an average particle size of 2.5 μm A mixture of Ag powder, 50% by weight (46% by weight of the whole) of Ag powder with an average particle diameter of 20 μm, and 92% by weight of silver mixed powder was used as the silver base composition.

[0137] 0.2 g of hollow glass powder (Glass Bubbles manufactured by Sumitomo 3M Co., Ltd.: bulk density of 0.075 g / cm 3 , the true density is 0.125g / cm3 , the particle size is 65μm, and the bulk volume of 0.2g in the state of being alone is 2.67cm 3 ) to make a composition for silver sintering.

[0138] Based on the volume and weight when the silver sintering composition was shaped into a cube, the density of the silver sintering composition was found to be 5.51 g / cm 3 .

[0139] The silver sintering composition is filled to an inner diameter of ...

Embodiment 2～8

[0146] Appropriately change the addition amount and size of the hollow glass powder to the conditions shown in Table 2, so that the bulk volume of the hollow glass powder accounts for the range of 5% to 160% of the whole composition. 1 is carried out in the same manner. The firing conditions were set at 600°C for 30 minutes, and the results are shown in Table 2 and Table 3.

Embodiment 9

[0163] A mixture of 8% by weight of organic binder solution consisting of 8.75% by weight of starch, 10% by weight of cellulose and the rest of water and 92% by weight of Au powder with an average particle size of 4.5 μm was used as the basic gold composition.

[0164] 5.4 g of hollow glass powder (Glass Bubbles manufactured by Sumitomo 3M Co., Ltd.: bulk density of 0.378 g / cm2) was mixed in 94.6 g of the gold basic composition 3 , the true density is 0.6g / cm 3 , particle size of 27 μm), made into a composition for gold sintering.

[0165] This gold sintering composition was molded with a silicon mold, and fired in an electric furnace at 800° C. for 30 minutes. The weight of the sintered body obtained by firing was 31.6 g, and the weight of the sintered body of the same volume without adding the hollow glass powder was 52.3 g, so the weight decreased by 40.0%. The results are also listed in Table 2.

[0166] The finished samples were tumble milled. As a result, metallic lu...

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Abstract

A composition for precious metal sintering that, by firing, yields a precious metal sinter for use in jewelry, ornaments, accessories, etc., especially that realizes not only production of a precious metal sinter even when the precious metal content per volume of the composition for precious metal sintering is reduced but also striking reduction of the weight of the precious metal sinter. Further, there are disclosed a process for producing the precious metal sinter and the precious metal sinter. This composition for precious metal sintering is characterized by consisting of a mixture of precious metal powder, hollow glass powder and organic binder solution.

Description

technical field [0001] The present invention relates to a precious metal sintering composition capable of obtaining a precious metal sintered body used for jewel ornaments, decorations, decorative accessories and the like. Specifically, the present invention relates to a noble metal sintering composition, a method for obtaining the noble metal sintered body, and a noble metal sintered body thereof, which can reduce the noble metal content per unit volume of the noble metal sintering composition. A sintered body of noble metal can be obtained, and at the same time, the weight of the sintered body of noble metal can be reduced. Background technique [0002] A noble metal sintering composition (also called a noble metal clay-like composition or a noble metal plastic composition.) mainly composed of a noble metal powder and an organic binder is well known. The composition for noble metal sintering is molded into a predetermined shape, dried, and then heated and sintered to remo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/11
CPCC22C32/0089C22C1/05C22C5/06B22F3/1112C22C1/0466C22C1/10Y10T428/249969
Inventor 向山星刚田中雅树粕川知昭
Owner AIDA CHEM IND
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