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Preparation method of silver coated copper powder for electronic slurry

A technology of silver-coated copper powder and electronic paste, applied in the direction of coating, etc., can solve the problems of complex process steps, complex raw material components, easy deposition of silver layer, etc., and achieve simple process steps, high oxidation resistance, and raw material composition simple effect

Inactive Publication Date: 2012-01-25
NINGBO GUANGBO NEW NANOMATERIALS STOCK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above-mentioned method for electroless silver plating on the surface of copper powder has the disadvantages that the raw material components are more complicated, the process steps are more complicated, and some reagents such as silver cyanide are poisonous, and some need to carry out electroless plating at a temperature higher than room temperature, etc. , and during the plating process, the inner wall of the reaction vessel is easy to deposit silver layer and cause the waste of silver

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 10 grams of 500nm spherical copper powder raw material, add it to the reaction vessel, then add 200ml of nitric acid with a mass concentration of 5%, and stir ultrasonically for 5 minutes to remove oxides on the surface of the copper powder raw material, then filter and collect the filter residue, and clean the filter residue with distilled water 3 times to get pickled copper powder. Weigh 12 grams of EDTA and add it into 400 ml of deionized water to form a complex solution, then add the pickled copper powder into the complex solution, and stir evenly to obtain a reducing solution. Weigh 3 grams of silver nitrate and add it to 150 milliliters of deionized water, then add 3 milliliters of ammonia water with a mass concentration of 28%, and stir to obtain a transparent silver-ammonia solution. Under the dispersing and stirring of an ultrasonic disperser with a power of 500W, the silver ammonia solution was added to the reducing solution at a rate of 0.05 L / min for r...

Embodiment 2

[0025] Weigh 52 grams of 800nm ​​spherical copper powder raw material, add it to the reaction vessel, then add 200ml of sulfuric acid with a mass concentration of 5%, and stir ultrasonically for 10 minutes to remove oxides on the surface of the copper powder raw material, then filter and collect the filter residue, and clean the filter residue with distilled water 3 times to get pickled copper powder. Weigh 74.43 g of EDTA-2Na and add it into 2000 ml of deionized water to form a complex solution, then add the pickled copper powder into the complex solution, and stir evenly to obtain a reducing solution. Weigh 31.4 grams of silver nitrate and add it to 600 milliliters of deionized water, then add 42.9 milliliters of ammonia water with a mass concentration of 25%, and stir to obtain a transparent silver ammonia solution. Under the dispersing and stirring of an ultrasonic disperser with a power of 300W, the silver ammonia solution was added to the reducing solution at a rate of 0...

Embodiment 3

[0027] Weigh 100 grams of 3um flake copper powder raw material, add it to the reaction vessel, then add 400ml of formic acid with a mass concentration of 8%, and ultrasonically stir for 15 minutes to remove oxides on the surface of the copper powder raw material, then filter and collect the filter residue, and filter the filter residue with distilled water. Wash 3 times to get pickled copper powder. Weigh 68.89 g of EDTA and add it into 4000 ml of deionized water to form a complex solution, then add the pickled copper powder into the complex solution, and stir evenly to obtain a reducing solution. Weigh 33.05 grams of silver nitrate and add it to 600 milliliters of deionized water, then add 45.1 milliliters of ammonia water with a mass concentration of 25%, and stir to obtain a transparent silver-ammonia solution. Under the dispersing and stirring of an ultrasonic disperser with a power of 300W, the silver ammonia solution was added to the reducing solution at a rate of 0.06L / ...

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Abstract

The invention provides a preparation method of silver coated copper powder for electronic slurry, which comprises the following operation steps of: (1) adding a certain mass of copper powder raw materials into a reaction container, adding acid solution, carrying out ultrasonic stirring for 5 to 15 min, filtering materials, and collecting filter residue; (2) weighing a proper amount of complexing agents, adding the complexing agents into deionized water, then, adding copper powder after acid washing, carrying out stirring dispersion, and obtaining reducing liquid; (3) weighing a proper amount of silver nitrate, adding the silver nitrate into the deionized water, adding ammonia water, stirring the solution until the solution is transparent, and obtaining silver-ammonia solution; (4) adding the silver-ammonia solution into the reducing liquid for taking reaction under the dispersion stirring of an ultrasonic dispersing device; and (5) filtering the solution after the reaction, washing the filter residue by the deionized water and / or absolute ethyl alcohol, carrying out vacuum drying, and obtaining the product of the silver coated copper powder for the electronic slurry. The preparation method has the advantages that the raw material ingredients are simple, the technical steps are simple, the preparation method can be used for large-scale production, and in addition, a silver layer can not be deposited on the surface of the reaction container.

Description

technical field [0001] The invention relates to the technical field of metal powders, in particular to a method for preparing silver-coated copper powder for electronic paste. Background technique [0002] As human beings step into the information society, the process of miniaturization, chipping, and multi-layering of various electronic components is accelerating. The electronic paste with silver, gold, nickel, copper and other metal powders The demand for materials (conductive coatings, conductive adhesives) is also increasing. Electronic paste is widely used as electrodes of resistors, capacitors, inductors, etc., as well as shielding coatings to prevent electromagnetic interference. Ultrafine silver powder is the main component of a commonly used conductive coating and conductive paste, which has high conductivity (ρv=1.62×10 -6 ΩCM), high oxidation resistance and high plasticity, is the earliest used in all metals for conductive fillers, the US military used it as an ...

Claims

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Application Information

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IPC IPC(8): B22F1/02C23C18/44
Inventor 王翠霞陈钢强周峰赵成磊王利平
Owner NINGBO GUANGBO NEW NANOMATERIALS STOCK
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