Clay composition for sintered noble metal objects and method of producing, clay composition for sintered noble metal objects and method of producing sintered noble metal

A precious metal and composition technology, which is applied in the field of producing precious metal sintered bodies, can solve the problems of partial shedding of clay, damage to the appearance of molded products, loosening of decorative parts, etc., and achieves the effects of reducing energy consumption and expanding the range of sintering temperature.

Inactive Publication Date: 2004-06-16
AIDA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially when producing products that combine ceramics and various metal decorative parts, if the degree of shrinkage is estimated to be too large, it may cause the decorative parts to loosen and fall off from the clay part before firing
On the contrary, if the degree of shrinkage is too small, the target shape cannot be molded, and as a result, a distorted shape is produced, and finally, protrusions are caused by a large shrinkage, which causes deformation of the clay portion adjacent to the decorative part and spoils the aesthetics of the molded product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The mixed silver powder of 92wt% is mixed with the water-soluble binder that is made up of 0.7wt% starch, 0.8wt% cellulose and remainder water, makes clay composition, and the mixed silver powder wherein is made of 50% by weight (46wt% ) silver powder with an average particle diameter of 2.5 μm and 50% by weight (46 wt %) of silver powder with an average particle diameter of 20 μm. The clay composition was molded into a test sample having a size of 50 mm long x 10 mm wide x 1.5 mm thick, and the test sample was sintered under the following conditions. Methylcellulose (manufactured by Shin-etsu Chemical Industry Co., Ltd., sold under the trade name "Methlose SM8000") was used as cellulose, β-potato starch (manufactured by Nichiden Kagaku K.K., sold under the trade name "DELICAM-9") sold) as starch.

[0034] Firing conditions

Degree of shrinkage

(%)

Bending strength

(kgf / mm 2 )

cracked / bent

Evaluation

590℃&5min

...

Embodiment 2

[0046] The mixed gold powder of 94wt% is mixed with the water-soluble binding agent that is made up of 0.5wt% starch, 0.6wt% cellulose and remainder water, makes clay composition, and the mixed gold powder wherein is made of 50% by weight (47wt% ) gold powder with an average particle diameter of 2.5 μm and 50% by weight (47 wt %) of gold powder with an average particle diameter of 20 μm. The clay composition was molded into a test sample having a size of 50 mm long x 10 mm wide x 1.5 mm thick, and the test sample was fired under the following conditions.

[0047] Firing conditions

Degree of shrinkage

(%)

Bending strength

(kgf / mm 2 )

cracked / bent

Evaluation

690℃&5min

5.9

7.98

burst

×

690℃&30min

5.9

8.12

burst

×

700℃&5min

6.7

10.88

to bend

○

700℃&30min

7.8

24.74

to bend

○

750℃&5min

...

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Abstract

A clay composition for shaping noble metal is formed of a kneaded mixture of a mixed powder of noble metal having as main components thereof 30 to 70% by weight of a powder having an average particle diameter in the range of 2.2 to 3.0 mum and 70 to 30% by weight of a powder having an average particle diameter in the range of 5 to 20 mum with an aqueous solution of an organic binder.

Description

technical field [0001] The present invention relates to a clay composition for molding precious metals, which can be used as raw materials for the production of shaped articles made of precious metals and handicraft deep processing elements, such as precious metal gemstones, fine craft products and ornaments, which shrink very little during sintering, The present invention also relates to a method for producing a noble metal sintered body. Background technique [0002] Recently, in the manufacture of moldings made of precious metals and deep-processing elements of handicrafts, the common way to produce precious metal moldings is to use a clay composition containing powdered precious metals and organic binders as basic components, and cast the clay composition into Predetermined shape, drying of the shaped clay composition, sintering of the dried shaped article followed by decomposition, evaporation, or combustion to remove the binder component and bond adjacent particles of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F1/00B22F1/052B22F1/10B22F3/00B22F3/10B22F3/22
CPCB22F1/0059B22F1/0014B22F3/22B22F1/052B22F1/10B22F1/00
Inventor 藤丸笃矢次昭孔粕川知昭
Owner AIDA CHEM IND
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