Preparation method of Al-Ag alloy powder plated with silver chemically

An electroless silver plating and alloy powder technology, applied in the field of electroless plating, can solve the problems of poor powder uniformity and cumbersome pretreatment process, etc., achieve complete and uniform silver coating, reduce cost and energy consumption, and improve bonding strength Effect

Active Publication Date: 2012-07-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three main methods of preparing silver-coated aluminum powder reported at present. One is to directly carry out electroless silver plating by redox reaction after the Al powder is activated and sensitized. The uniformity of the powder obtained by this method is not very good, and the pretreatment process is cumbersome.

Method used

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  • Preparation method of Al-Ag alloy powder plated with silver chemically
  • Preparation method of Al-Ag alloy powder plated with silver chemically
  • Preparation method of Al-Ag alloy powder plated with silver chemically

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Preparation of Al-Ag alloy powder: Spray alloy powder with a silver content of 1 wt%.

[0023] 2) Pretreatment of Al-Ag alloy powder: take 2g of alloy powder and corrode it with a NaOH solution with a concentration of 0.02wt%. all over.

[0024] 3) Silver-coated Al-Ag alloy powder: at room temperature and normal pressure, place the alloy powder in a silver nitrate solution with a concentration of 10wt% for precursor replacement reaction; after replacement for 30 minutes, separate the powder and place it in a 100ml In the electroless silver plating reducing solution, the reducing solution is composed of glucose (27g / L), thiourea (2mg / L), tartaric acid (4g / L), absolute ethanol, etc., and the silver salt is silver ammonia solution (50g / L) , under ultrasonic conditions, drop 50ml of silver ammonia solution into the reducing solution drop by drop, the pH is 11.5, the temperature is 30°C, and react for 20min; after the plating is finished, wash with water and dry in vacuu...

Embodiment 2

[0027] 1) Preparation of Al-Ag alloy powder: Spray alloy powder with a silver content of 3 wt%.

[0028] 2) Pretreatment of Al-Ag alloy powder: take 4g of alloy powder, corrode it with a NaOH solution with a concentration of 0.03wt%, and when fine bubbles are seen to be precipitated, the alloy powder after the film removal and coarsening is rapidly washed with deionized water for 3 all over.

[0029] 3) Silver-coated Al-Ag alloy powder: at room temperature and normal pressure, place the alloy powder in a silver nitrate solution with a concentration of 5wt% for precursor replacement reaction; after 30 minutes of replacement, separate the powder and place it in a 100ml In the electroless silver plating reducing solution, the reducing solution is composed of glucose (27g / L), thiourea (2mg / L), tartaric acid (4g / L), absolute ethanol, etc., and the silver salt is silver ammonia solution (50g / L) , under ultrasonic conditions, drop 50ml of silver ammonia solution into the reducing so...

Embodiment 3

[0032] 1) Preparation of Al-Ag alloy powder: Spray alloy powder with a silver content of 5 wt%.

[0033] 2) Pretreatment of Al-Ag alloy powder: take 3g of alloy powder and corrode it with a NaOH solution with a concentration of 0.02wt%. all over.

[0034] 3) Silver-coated Al-Ag alloy powder: at room temperature and normal pressure, place the alloy powder in a silver nitrate solution with a concentration of 10wt% for precursor replacement reaction; after the replacement for 40 minutes, separate the powder and place it in a 100ml In the electroless silver plating reducing solution, the reducing solution is composed of glucose (27g / L), thiourea (2mg / L), tartaric acid (4g / L), absolute ethanol, etc., and the silver salt is silver ammonia solution (50g / L) , under ultrasonic conditions, drop 50ml of silver ammonia solution into the reducing solution drop by drop, the pH is 11.5, the temperature is 35°C, and react for 30min; after the plating is finished, wash with water and dry in v...

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Abstract

The invention relates to a preparation method of Al-Ag alloy powder plated with silver chemically, belonging to the technical field of chemical plating. The method comprises the following steps of: taking Al-Ag alloy powder, corroding the Al-Ag alloy powder by a NaOH solution and washing; placing the alloy powder into a silver nitrate solution with a certain concentration to perform a precursor replacement reaction under room temperature and constant pressure; separating the powder out and placing the powder into a chemically silver-plating reducing liquid, and dropwise adding the silver-ammonia solution into the reducing liquid under an ultrasonic condition, wherein the reducing liquid consists of glucose, thiocarbamide, tartaric acid and absolute ethyl alcohol, and silver salt is a silver-ammonia solution; performing washing and vacuum drying after completing plating; and carrying out heat treatment on the silver-plated powder obtained in the above step under a vacuum condition at 240-600 DEG C for 2 hours, and finally, obtaining the Al-Ag powder with complete and uniform silver layer coating and good electrical conductivity. The process is simple and easy to operate, and the cost and energy consumption are reduced.

Description

technical field [0001] The invention relates to a method for coating metallic silver on the surface of aluminum alloy powder, in particular to a preparation method for coating metallic silver on the surface of aluminum alloy powder directly through chemical plating to obtain silver-coated aluminum alloy powder, which belongs to the technical field of chemical plating . Background technique [0002] Metallic silver has the characteristics of good electrical conductivity, decoration, antibacterial, weldability, reflectiveness, corrosion resistance, etc. It is widely used in aerospace, optical instruments, radio communication equipment, laser and other fields, but silver also has Disadvantages such as easy migration and high price restrict the use of silver to a certain extent. Coating silver on the surface of other material substrates can not only save silver materials, but also show the special properties of metallic silver, and can give full play to the functions of the two...

Claims

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Application Information

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IPC IPC(8): C23C18/44B22F1/02
Inventor 王群李冬梅瞿志学王澈李永卿
Owner BEIJING UNIV OF TECH
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