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Silver-coated copper powder with core-shell structure and preparation method and application thereof

A technology of silver-coated copper powder and shell-core structure, applied in the field of materials

Active Publication Date: 2020-06-23
深圳市夏特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the frictional collision of the dielectric sphere inevitably leads to the deposition of fresh silver on the high-energy dielectric sphere

Method used

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  • Silver-coated copper powder with core-shell structure and preparation method and application thereof
  • Silver-coated copper powder with core-shell structure and preparation method and application thereof
  • Silver-coated copper powder with core-shell structure and preparation method and application thereof

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preparation example Construction

[0042] A preparation method of silver-coated copper powder with shell-core structure, specifically comprising the following steps:

[0043] (1) Disperse the copper powder in the isopropanol solution to prepare a 30-35 g / L copper powder isopropanol mixture, and then add FeCl with 0.3-0.6 times the mass of the copper powder 3 , dispersed evenly to obtain solution A;

[0044] (2) Configure 6-9 g / L SnCl 2 / TiCl 3 hydrochloric acid solution (seed growth agent) in which SnCl 2 / TiCl 3 The mass ratio is 1:1-1:5; then the above solution is dissolved in isopropanol solution to obtain solution B;

[0045] (3) Add solution B to solution A while stirring, and then keep at 40-70 ℃ for 1-2 h;

[0046] (4) Copper powder mass 0.5-1.5% AgNO 3 Dissolve in isopropanol solution to obtain C solution; then add C to (3) while stirring, stir for 1-2 h, then raise the temperature to 40-70 °C for 2-3 h;

[0047] (5) Add 2-10% copper powder mass dispersant to the solution in (4), and keep it at 30-...

Embodiment 1

[0056] (1) Disperse 1 g of flake copper powder in isopropanol at room temperature, and the concentration of copper powder is 33 g / L;

[0057] (2) Add 0.5 g FeCl to (1) 3 , stirring at room temperature for 2-10 min;

[0058] (3) The seed adsorbent SnCl 2 and TiCl 3 Add the mixed hydrochloric acid solution into isopropanol, the ratio of SnCl2 and TiCl3 is 1:3, and the concentration is 8 g / L to configure A solution. Add solution A slowly into (2) and keep stirring. After all the addition, the system is heated to 40-70 ℃ for 1-2 h;

[0059] (4) 0.01g AgNO 3 Add a small amount of isopropanol to configure solution B, and stir to dissolve. Add solution B slowly to (3) with constant stirring. When all the solution B was added, stir at room temperature for 1-2 h. Then, the system was heated to 40-70 °C for 2-3 h;

[0060] (5) Add 0.02 g of dispersant to (4), and heat the system to 30-50 °C for 3 h;

[0061] (6) Add 0.12 g complexing agent to (5) and keep for 1 h;

[0062] (7...

Embodiment 2

[0066] (1) Disperse 1 g of flake copper powder in isopropanol at room temperature, and the concentration of copper powder is 33 g / L;

[0067] (2) Add 0.5 g FeCl to (1) 3 , stirring at room temperature for 2-10 min;

[0068] (3) The seed adsorbent SnCl 2 and TiCl 3 The mixed hydrochloric acid solution was added to isopropanol, the ratio of SnCl2 and TiCl3 was 1:3, and the concentration was 8 g / L to configure A solution. Add solution A slowly into (2) and keep stirring. After all the addition, the system is heated to 40-70 ℃ for 1-2 h;

[0069] (4) 0.01g AgNO 3 Add a small amount of isopropanol to configure solution B, and stir to dissolve. Add solution B slowly to (3) with constant stirring. When all the solution B was added, stir at room temperature for 1-2 h. Then, the system was heated to 40-70 °C for 2-3 h;

[0070] (5) Add 0.02 g of dispersant to (4), and heat the system to 30-50 °C for 3 h;

[0071] (6) Add 0.12 g complexing agent to (5) and keep for 1 h;

[00...

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Abstract

The invention relates to silver-coated copper powder with a core-shell structure and a preparation method thereof, and belongs to the technical field of materials. The silver-coated copper powder is prepared by adopting copper powder surface treatment, a seed growth method, a heterogeneous nucleation method and a chemical plating method. Specifically, firstly, the surface of Cu is roughened by using FeCl3, seed growth is performed by adopting SnCl2 and TiCl3, and cleaning is conducted by using isopropanol; then heterogeneous nucleation is performed by using AgNO3, and a dispersing agent is added into the resulting solution for dispersing; and finally, a reducing agent, a silver nitrate solution and a complexing agent are added for chemical silver plating, and the silver-coated copper powder is obtained by washing and filtering. The method can be used for preparing the silver-coated copper powder more efficiently, and is easy to operate and suitable for industrial production, and the reaction rate is convenient to control.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a silver-coated copper powder with a core-shell structure and a preparation method and application thereof. Background technique [0002] The research on conductive silver powder has already begun in the 1940s and 1950s. Conductive silver powder is widely used and is the main raw material for making conductive coatings, conductive inks, and electronic pastes. However, due to the high price of silver, the application cost is relatively high. In view of this shortcoming, as a new type of composite material, silver-coated copper powder can be regulated according to the density, thickness and coating amount of the coated silver layer. It can replace pure silver powder and significantly reduce the material cost. Moreover, silver-clad copper powder has the advantages of good high temperature resistance, chemical corrosion resistance, and migration resistance. [0003] The ideal ...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/24C23C18/44
CPCB22F9/24C23C18/44B22F1/17
Inventor 王晓磊王丽丽韩楠耿琦瑶
Owner 深圳市夏特科技有限公司
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