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Preparation method of silver coated aluminum alloy powder for conductive filler

A technology of alloy powder and powder, applied in the field of electroless plating, which can solve problems such as easy agglomeration, failure of plating solution decomposition, and difficult plating

Active Publication Date: 2014-08-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electroless silver plating on aluminum powder generally requires complex pre-treatments, such as degreasing, roughening, sensitization, activation, etc., which not only increases the complexity of the process, increases the cost, but also increases the performance of the composite powder. stability
At the same time, due to the high surface activity of aluminum powder, it is easy to agglomerate, which increases the difficulty of plating, and aluminum is an amphoteric metal, so it is unstable in acidic and alkaline environments. It is very easy to agglomerate and participate in reactions during the electroless plating process, resulting in Liquid decomposition fails, aluminum powder is easy to oxidize to form a dense oxide film, which hinders the activation and sensitization of aluminum powder, so that the aluminum powder cannot be completely coated. Therefore, compared with other silver-plated metal powders, it is more difficult to coat aluminum powder. , so it is particularly important to further study the effect of plating substrate, plating solution formulation, plating process and post-plating treatment on the coating structure and material properties

Method used

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  • Preparation method of silver coated aluminum alloy powder for conductive filler
  • Preparation method of silver coated aluminum alloy powder for conductive filler
  • Preparation method of silver coated aluminum alloy powder for conductive filler

Examples

Experimental program
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Effect test

Embodiment example 1

[0022] 1) Preparation of Al-La alloy powder: Alloy powder with an alloying element La content of 0.3 wt% was prepared by vacuum atomization method.

[0023] 2) Heat treatment before Al-La alloy powder plating, the heat treatment temperature is 100°C and the time is 2h.

[0024] 3) Pretreatment of Al-La alloy powder: Take 2g of alloy powder, corrode it with 0.02wt% NaOH solution under ultrasonic conditions, and wash it with deionized water 3 times when bubbles are seen.

[0025] 4) Direct electroless silver plating of Al-La alloy powder: under the condition of room temperature and normal pressure, place the alloy powder after roughening treatment in the previous step in 100ml of electroless silver plating reducing solution, the reducing solution is composed of glucose (30g / L) , thiourea (2mg / L), potassium sodium tartrate (3g / L), absolute ethanol (50ml) and the rest are composed of deionized water, silver salt is silver ammonia solution (20g / L) 50ml, under stirring conditions T...

Embodiment example 2

[0027] 1) Preparation of Al-Zn alloy powder: an alloy powder with an alloying element Zn content of 1 wt% was prepared by a vacuum atomization method.

[0028] 2) Heat treatment before Al-Zn alloy powder plating, the heat treatment temperature is 150°C and the time is 1h.

[0029] 3) Pretreatment of Al-Zn alloy powder: take 2g of alloy powder, wash and corrode with NaOH solution with a concentration of 0.03wt% under ultrasonic conditions, when bubbles are seen, wash the alloy powder with deionized water 3 times.

[0030] 4) Direct electroless silver plating of Al-Zn alloy powder: under the condition of room temperature and normal pressure, the alloy powder after roughening treatment in the previous step is placed in 100ml of electroless silver plating reducing solution, and the reducing solution is composed of glucose (30g / L) , thiourea (2mg / L), potassium sodium tartrate (3g / L), absolute ethanol (50ml) and the rest are composed of deionized water, silver salt is silver ammonia...

Embodiment example 3

[0032] 1) Preparation of Al-Mg alloy powder: The alloy powder with alloying element Mg content of 2wt% was prepared by vacuum atomization method

[0033] 2) The Al-Mg alloy powder is heat treated before plating, the heat treatment temperature is 200°C and the time is 0.5h.

[0034] 3) Pretreatment of Al-Mg alloy powder: take 2g of alloy powder, wash and corrode it with 0.04wt% NaOH solution under ultrasonic conditions, when bubbles are seen, wash the alloy powder three times with deionized water.

[0035] 4) Direct electroless silver plating of Al-Mg alloy powder: under the condition of room temperature and normal pressure, place the alloy powder after roughening treatment in the previous step in 100ml of electroless silver plating reducing solution, the reducing solution is composed of glucose (30g / L) , thiourea (2mg / L), potassium sodium tartrate (3g / L), absolute ethanol (50ml) and the rest are composed of deionized water, silver salt is silver ammonia solution (20g / L) 50ml, ...

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PUM

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Abstract

The invention relates to a preparation method for direct chemical silvering of Al alloy powder. The method is characterized by comprising the steps of: preparation of the Al alloy powder: employing a vacuum atomization process, and controlling the second element mass content of the alloy in the range of 0.3-10%; pre-plating heat treatment of the Al alloy powder: performing heat treatment at 100-400DEG C for 0.5-5h; pretreatment of the Al alloy powder: conducting corrosion washing on the alloy powder by a 0.03-0.05wt% NaOH solution under ultrasonic wave, and then performing washing by water; direct chemical silver plating of the Al alloy powder; and carrying out washing and vacuum drying after plating. The method provided by the invention has no need for activation and sensitization during chemical silver plating, the process is simple and easy to operate, and the cost and energy consumption are lowered.

Description

technical field [0001] The invention relates to a method for coating metal silver on the surface of aluminum alloy powder, in particular to a method for coating metal silver on the surface of aluminum alloy powder directly by chemical plating to obtain a preparation method for silver-coated aluminum alloy powder, belonging to the technical field of chemical plating . Background technique [0002] With the development of modern high-tech, the application of conductive fillers is more and more extensive. Adding conductive fillers to adhesives, inks, coatings, rubber and plastics and other materials will endow these materials with special properties, such as conductive magnetic permeability, electromagnetic Shielding performance, antistatic performance, etc., are widely used in aerospace, electronic communications, electronic printing and other industries. As an important part of conductive composites, conductive fillers directly affect the conductivity and stability of conduc...

Claims

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Application Information

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IPC IPC(8): C23C18/44B22F1/02
Inventor 王群李叶凡李永卿王澈
Owner BEIJING UNIV OF TECH
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