Preparation method for flaky silver coated copper powder

A silver-coated copper powder and flake technology, applied in the field of preparation of flake silver-coated copper powder, can solve the problems of poor bonding between silver coating and copper matrix, difficulty in obtaining silver-coated copper powder products, poor bonding between coating and matrix, etc. , to achieve the effect of no special equipment requirements, good quality, good anti-oxidation ability

Inactive Publication Date: 2014-07-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the activation process can increase the coating rate of metallic silver on the surface of copper powder, the resulting coating layer is still in a discontinuous dotted shape, and it is difficult to obtain a completely coated silver-coated copper powder product. Therefore, its oxidation resistance is not good. ideal
There are also technicians who use spherical silver-coated copper powder as raw material to prepare silver-coated copper powder by ball milling. However, due to the poor bonding between the silver coating of the spherical silver-coated copper powder and the copper substrate, and the difference in ductility between silver and copper, it is easy to cause The phenomenon of separation of the silver plating layer from the copper substrate during the ball milling process makes the quality of the obtained silver-coated copper powder poor
In addition, according to the existing literature, there is no report on the preparation of silver-coated copper powder directly by ball milling.
[0005] In short, the existing silver-coated copper powder production technology has disadvantages such as long process, poor coating uniformity, and poor coating effect, and these problems are mostly caused by insufficient density of the coating or poor bonding between the coating and the substrate

Method used

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  • Preparation method for flaky silver coated copper powder
  • Preparation method for flaky silver coated copper powder
  • Preparation method for flaky silver coated copper powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] in N 2 Under the atmosphere, use silver balls with a diameter of 3mm as the grinding medium and spherical copper powder with a particle size of 4.5um as raw materials. The weight ratio of silver balls to copper powder is controlled to be 50:1. After ball milling at 300rpm for 8 hours, it is sieved and separated. Silver-coated copper powder with a particle size of 9.6um can be obtained under the sieve, and its silver content is about 11.8%, and the silver balls on the sieve can be returned to the ball milling process for use.

Embodiment 2

[0036] in N 2 Under the atmosphere, use silver balls with a diameter of 1mm as the grinding medium and spherical copper powder with a particle size of 6.2um as the raw material. The weight ratio of the silver balls to the copper powder is controlled at 30:1. After ball milling at 500rpm for 6 hours, it is sieved and separated. The silver-coated copper powder with a particle size of 6.4um can be obtained under the sieve, and its silver content is about 8%, and the silver balls on the sieve can be returned to the ball milling process for use.

Embodiment 3

[0038] in Ar 2 Under the atmosphere, use silver balls with a diameter of 8mm as the grinding medium and spherical copper powder with a particle size of 0.5um as the raw material, control the weight ratio of silver balls to copper powder to 40:1, ball mill at 200rpm for 2 hours, and then sieve and separate. Silver-coated copper powder with a particle size of 12um can be obtained under the sieve, and its silver content is about 5%, and the silver balls on the sieve can be returned to the ball milling process for use.

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Abstract

The invention relates to a preparation method for flaky silver coated copper powder. Under inert atmosphere, silver balls with the diameters of 0.5-10 mm are used as a milling media and the silver balls are separated through sieving after ball milling is performed on spherical copper powder in a ball milling machine for 2-8 h, so that the flaky silver coated copper powder can be obtained, and the silver balls are returned to a ball milling working procedure for being used continuously. The preparation method provided by the invention has the characteristics of simple technology, low cost and the like, compact flaky silver coated copper powder product with complete surface coating can be obtained, and the product has excellent electrical conductivity and oxidation resistance, is an ideal silver substitute product and has a good application prospect.

Description

technical field [0001] The invention relates to a preparation method of flaky silver-coated copper powder, which belongs to the technical field of preparation of electronic materials and functional powder materials. Background technique [0002] Metal copper powder is widely used in conductive fillers and electromagnetic shielding fields because of its excellent conductivity. However, copper powder has high activity and is easily oxidized in the air, forming a layer of non-conductive oxide film on its surface, making it Conductivity decreases rapidly. In order to overcome this shortcoming, technicians have carried out extensive research and achieved some valuable results, among which the coating scheme has attracted much attention because of its good antioxidant effect. The coating method can be roughly divided into two categories, one is the organic coating method, that is, a dense organic metal film is formed on the surface of the copper powder through the action of organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02
Inventor 李玉虎刘志宏刘付朋刘智勇李启厚谌伟谢勇贤
Owner CENT SOUTH UNIV
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