A kind of preparation method of silver clad aluminum alloy powder for conductive filler

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 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] With the development of modern high-tech, the application of conductive fillers is becoming 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 electrical conductivity, magnetic conductivity, electromagnetic Shielding performance, antistatic performance, etc., are widely used in aerospace, electronic communication, electronic printing and other industries. As an important part of conductive composite materials, conductive fillers directly affect the con...

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

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