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Preparation method for precious metal powder with high tap density

A technology of tap density and precious metal, applied in the field of preparation of precious metal powder, can solve the problems of insufficient dense film layer, particle agglomeration, large slurry sintering shrinkage, etc., and achieve the effect of simple and easy reaction steps and taking into account the dispersibility.

Inactive Publication Date: 2017-01-04
CHINA ZHENHUA GRP YUNKE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the precious metal powder produced by domestic enterprises has problems such as particle agglomeration and poor dispersion. The prepared slurry has large sintering shrinkage and the film layer is not dense enough, so it is not suitable for high-end fields such as LTCC technology and solar cells.

Method used

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  • Preparation method for precious metal powder with high tap density
  • Preparation method for precious metal powder with high tap density
  • Preparation method for precious metal powder with high tap density

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Prepare 1L of silver nitrate solution with a concentration of 200g / L and 1L of vitamin C reduction solution with a concentration of 200g / L, respectively, and add 500mL of a gelatin dispersant solution with a concentration of 200g / L and 5mL of polyethylene with a concentration of 1g / mL to the reduction solution. Alcohol butyral solution, take the reducing agent solution after adding the dispersant as the mother liquor, add the silver nitrate solution drop by drop into the reducing mother liquor while stirring, continue stirring for 5-10min after the addition is completed, and pour the powder after the color of the powder no longer changes. Add 1g of ethyl octanoate to the reaction system, and then let it settle; wash the precipitate with deionized water for 3-5 times, and dry the powder at 60°C. The obtained silver powder is as follows: figure 1 As shown, it has a good spherical shape, and its particle size distribution is as follows figure 2 As shown, the D50 is 2.3 μm...

Embodiment 2

[0031] Preparation concentration is 1L of chloroauric acid solution 1L of 100g / L and 1L of vitamin C reducing solution of 100g / L respectively, and in reducing solution, add 500mL concentration and be the polyvinyl alcohol dispersant solution of 20g / L, to add the dispersant after The reducing agent solution is the mother liquor. Add the chloroauric acid solution to the reducing mother liquor within 5 seconds under stirring. After the addition, continue to stir for 5-10 minutes. After the powder color no longer changes, add 0.5g stearic acid to the reaction system, and then Set aside to settle; after washing the precipitate with deionized water for 3-5 times, dry the powder at 60°C, the obtained gold powder is as follows image 3 As shown, it has good spherical shape, D50 is 1.7μm, good dispersion, narrow particle size distribution, and tap density is 8.1g / mL.

Embodiment 3

[0033] Preparation concentration is 1L of palladium nitrate solution 1L of 200g / L and 1L of sodium hypophosphite reducing solution of 200g / L respectively, and in reducing solution, add 160mL concentration and be 200g / L polyvinylpyrrolidone dispersant solution and 3mL concentration be 1g / L mL of acrylic resin solution, take the reducing agent solution after adding the dispersant as the mother liquor, add the palladium nitrate solution dropwise into the reducing mother liquor under stirring, continue stirring for 5-10min after the addition is completed, and pour the powder after the color of the powder no longer changes. Add 1g of cetyl alcohol to the reaction system, and then let it settle; wash the precipitate with deionized water for 3-5 times, and dry the powder at 60°C. The particle size distribution of the obtained palladium powder is as follows: Figure 4 As shown, the D50 is 1.4 μm, the dispersion is good, the particle size distribution is narrow, and the tap density is 5...

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Abstract

The invention discloses a reparation method for precious metal powder with high tap density. The preparation method comprises the following steps that (1) precious metal saline solution and reducing agent solution are prepared respectively; (2) a polymeric dispersant with the precious metal salt weight being 5-50% and a polymerization inhibitor with the precious metal salt weight being 0-5% are added to the reducing agent solution; (3) the precious metal saline solution is added to the reducing agent solution obtained from the step (2) in a stirring condition; (4) the solution is kept being stirred, sufficient reaction is ensured, then a surface modifier is added to a reaction system, and the powder surface is modified; (5) after powder centrifugal separation or powder free settling, and washing through deionized water is conducted several times; and (6) the precious metal powder with the high tap density is obtained after drying, powder disintegrating and dispersing. According to the reparation method for the precious metal powder with the high tap density, batch production can be achieved, dispersity of the obtained powder is good, and tap density is high.

Description

technical field [0001] The invention relates to a preparation method of noble metal powder, in particular to a preparation method of high tap density noble metal powder. Background technique [0002] Precious metal paste is the most important material in the field of electronics industry. With the miniaturization and miniaturization of electronic products and the development of micro-nano technology, various conductive thick film pastes are prepared from precious metal powder and widely used in printed circuits. The coating and circuit interconnection of the precious metal paste, while the printing resolution of the precious metal paste is greatly restricted by the performance parameters of the precious metal powder. Especially in recent years, a large number of applications and rapid development of LTCC technology have put forward higher requirements for precious metal powders. It requires precious metal powders to have the characteristics of high tap density and good dispe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00
Inventor 李程峰郭明亚庞锦标张秀杜玉龙韩玉成金矛
Owner CHINA ZHENHUA GRP YUNKE ELECTRONICS
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