Ball and ball like silver coated copper powder, flake silver coated copper powder, branched silver coated copper powder, and their application in electronic pastes

The Catalogue covers three categories: advanced basic materials, key strategic materials, and cutting-edge new materials, totaling 166 new materials. Advanced basic materials include advanced steel materials, advanced non-ferrous metal materials, advanced chemical materials, advanced inorganic non-metallic materials, and other materials. Key strategic materials include high-performance fibers and composite materials, rare earth functional materials, advanced semiconductor materials and new display materials, and new energy materials. The cutting-edge new materials include 9 new materials such as graphene modified anti-corrosion coatings, graphene films, graphene lubricants, and alloy powders for 3D printing.

Copper has similar conductivity to silver and is inexpensive, making it an ideal substitute material for silver. Due to the active chemical properties and easy oxidation of copper powder, it is not conducive to industrial applications. Silver plating with copper powder can solve this problem and achieve good results.

Our company producesFlake Silver Coated Copper PowderAdvanced chemical plating technology has been adopted. The ultrafine powder with uniform particle size and excellent oxidation resistance obtained by forming silver coatings of different thicknesses on the surface of silver coated copper powder, and then undergoing certain forming and processing processes, is an ideal conductive powder.

Silver content	Average particle size (D50, μ m)	shape	colour
3%，5%，8%，10%	13-17	Flaky	Copper red → Silver gray (with increasing silver content)
3%，5%，8%，10%	7	branch	Copper red → Silver gray (with increasing silver content)
3%，5%，8%，10%	12	branch	Copper red → Silver gray (with increasing silver content)
3%，5%，8%，10%	30	branch	Copper red → Silver gray (with increasing silver content)
3%，5%，8%，10%	45	branch	Copper red → Silver gray (with increasing silver content)
3%，5%，8%，10%	1	sphere	Copper red → Silver gray (with increasing silver content)
3%，5%，8%，10%	2.5	sphere	Copper red → Silver gray (with increasing silver content)
3%，5%，8%，10%	3.5	sphere	Copper red → Silver gray (with increasing silver content)

Spherical silver coated copper powder is usually prepared by ball milling of shaped powder, coating with sheet-like copper powder, etc; Good stability, good antioxidant performance, and good two-dimensional conductivity.

Silver plating on flake copper powder is somewhat difficult, and Fudi has conducted research on the preparation process and antioxidant properties of silver plating on copper powder. The experimental results show that after special treatment on the surface of copper powder, dotted silver particles are generated, and then the silver particles grow. The incomplete silver coating on the surface of copper powder, the excess silver ions in the solution under the action of reducing agent, further grow the surface silver layer, and obtain copper powder completely coated with silver. Through X-ray diffraction analysis, no oxide was found on the surface of the silver plated layer of the sheet-like copper powder, and the surface structure of the obtained powder was dense. The silver plated layer of branch copper powder has good resistance to high temperature oxidation.