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Preparation method for silver-coated copper powder

A technology of silver-coated copper powder and nano-copper powder, which is used in transportation and packaging, metal processing equipment, coating, etc., can solve the problems of poor electrical conductivity of silver-coated copper powder, and improve the compactness and coating stability. , the effect of improving electrical conductivity, uniformity and compactness

Inactive Publication Date: 2017-08-29
嘉兴市南湖区翊轩塑料五金厂(普通合伙)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in the preparation process of the traditional silver-coated copper powder, it is difficult for silver to form a uniform and dense coating on the surface of the copper powder, resulting in poor electrical conductivity of the silver-coated copper powder obtained, and a silver-coated copper powder is provided. Preparation method of copper clad powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] First weigh 128g of nano-copper powder, pour it into a beaker filled with 500mL of sulfuric acid solution with a mass fraction of 25%, then transfer the beaker to an ultrasonic oscillator, and conduct ultrasonic treatment for 4 hours at a temperature of 45 ° C and an ultrasonic frequency of 50 kHz. Then filter the material in the beaker to obtain the acid-washed nano-copper powder filter cake, and wash the acid-washed nano-copper powder filter cake with deionized water until the washing liquid is neutral, and then transfer the washed pickled nano-copper powder filter cake to vacuum In a drying oven, dry for 4 hours at a temperature of 80°C to obtain pretreated nano-copper powder; sequentially take 3g of dopamine, 800mL of deionized water, and 0.15mL of 5% hydrogen peroxide, pour them into a three-necked flask with a stirrer, Stir and mix at a speed of 800r / min for 15min, then add 58g of pretreated nano-copper powder and 3g of glucose under stirring, and dropwise add a ma...

example 2

[0020]First weigh 64g of nano-copper powder, pour it into a beaker filled with 400mL of sulfuric acid solution with a mass fraction of 20%, then transfer the beaker to an ultrasonic oscillator, and conduct ultrasonic treatment for 2 hours at a temperature of 35 ° C and an ultrasonic frequency of 45 kHz. Then filter the material in the beaker to obtain the acid-washed nano-copper powder filter cake, and wash the acid-washed nano-copper powder filter cake with deionized water until the washing liquid is neutral, and then transfer the washed pickled nano-copper powder filter cake to vacuum Dry in a drying oven at a temperature of 75°C for 2 hours to obtain pretreated nano-copper powder; take 2g of dopamine and 600mL of deionized water in sequence, pour them into a three-necked flask with a stirrer, and stir and mix at a speed of 600r / min for 10min. Then, under stirring state, add 32g of pretreated nano-copper powder and 2g of glucose, and dropwise add a mass fraction of 10% sodium...

example 3

[0022] First weigh 100g of nano-copper powder, pour it into a beaker filled with 450mL of sulfuric acid solution with a mass fraction of 22%, then transfer the beaker to an ultrasonic oscillator, and conduct ultrasonic treatment for 3 hours at a temperature of 40°C and an ultrasonic frequency of 47kHz. Then filter the material in the beaker to obtain the acid-washed nano-copper powder filter cake, and wash the acid-washed nano-copper powder filter cake with deionized water until the washing liquid is neutral, and then transfer the washed pickled nano-copper powder filter cake to vacuum Dry in a drying oven at a temperature of 77°C for 3 hours to obtain pretreated nano-copper powder; take 2g of dopamine and 700mL of deionized water in turn, pour them into a three-necked flask with a stirrer, and stir and mix at a speed of 700r / min for 12min. Then, under stirring state, add 50g of pretreated nano-copper powder and 2g of glucose, and dropwise add a mass fraction of 10% sodium hydr...

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Abstract

The invention relates to a preparation method for silver-coated copper powder, and belongs to the technical field of preparation of conductive materials. According to the preparation method, firstly, nano-copper powder is immersed in a sulfuric acid solution, the surface oxide layer of the nano-copper powder is removed through ultrasonic acid pickling, then dopamine is adsorbed on the surface of the nano-copper powder in an aqueous solution and is subjected to automatic polymerization on the surface of the nano-copper powder under an alkaline condition to form a uniform coating layer, the strong complexing adsorption capacity of the formed polydopamine coating layer is utilized for adsorbing silver ions in a silver nitrate solution, and potassium dihydrogen phosphate is used as a reducing agent in a nitrogen atmosphere to reduce the silver ions to form a uniform silver coating, and finally just vacuum drying and sintering needs to be carried out on the silver coating. According to the silver-coated copper powder prepared through the method, the silver can form a uniform and dense coating on the surface of the copper powder, so that the conductivity of the copper powder is improved, and the anti-oxidation temperature is higher than 620 DEG C.

Description

technical field [0001] The invention relates to a method for preparing silver-coated copper powder, which belongs to the technical field of conductive material preparation. Background technique [0002] The rapid development of the electronic information industry has driven the development of electronic paste with ultra-fine metal powder as the main functional phase, and with the development of electronic components to miniaturization, precision, and multi-function, the demand for electronic paste The requirements for technical indicators are also getting higher and higher. Common ultrafine metal powders include silver powder, gold powder, palladium powder, nickel powder, aluminum powder, copper powder, etc. Among them, silver powder is widely used in electronic components because of its excellent comprehensive performance. Copper is cheap and has a volume resistivity similar to that of silver, but copper powder is easily oxidized during preparation and use, which reduces t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02
CPCB22F1/17
Inventor 蒋春霞薛洋许丽君
Owner 嘉兴市南湖区翊轩塑料五金厂(普通合伙)
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