Silver-coated copper powder

Patent metadata

Field	Value
Publication number	US-10486231-B2
Application number	US-201615747963-A
Country	US
Kind code	B2
Filing date	Aug 17, 2016
Priority date	Aug 31, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A novel silver-coated copper powder, particularly a silver-coated copper powder particle having a dendritic shape, having increased electrical conductivity with no need to increase the silver content is provided. The silver-coated copper powder is composed of a silver-coated copper particle coated with a silver layer containing silver or a silver alloy, including a silver-coated copper particle having a dendritic shape, containing nitrogen (N) in the silver layer, and having a nitrogen (N) content of 0.2 to 10.0 parts by mass with respect to 100 parts by mass of the silver content.

First claim

The invention claimed is:

1. A silver-coated copper powder comprising a copper particle having a surface thereof coated with a silver layer containing silver or a silver alloy, said copper particle having a dendritic shape, the amount of silver coating of the silver-coated copper powder per unit specific surface area being 0.2 to 20.0 mass % g/m 2 ,
the silver-coated copper powder containing nitrogen (N) in the silver layer, and having a nitrogen (N) content of 0.2 to 10.0 parts by mass with respect to 100 parts by mass of the silver content of the silver-coated copper powder, and
the silver-coated copper powder having a volume cumulative particle diameter D50 of 0.5 μm to 10.0 μm as determined using a laser diffraction/scattering particle size distribution measurement apparatus.

2. The silver-coated copper powder according to claim 1 , having the nitrogen (N) content of 0.5 to 10.0 parts by mass with respect to 100 parts by mass of the silver content.

3. The silver-coated copper powder according to claim 1 , having a specific surface area of 1.02 m 2 /g to 5.00 m 2 /g.

4. The silver-coated copper powder according to claim 1 , wherein the silver-coated copper particle contains nitrogen (N) dispersively in its silver layer as analyzed by STEM-EDS mapping.

5. The silver-coated copper powder according to claim 1 , having a tap density of 0.5 to 3.5 g/cm 3 .

6. The silver-coated copper powder according to claim 1 , wherein the silver-coated copper particles having a dendritic shape account for more than 80% of the total number of the particles composing the silver-coated copper powder.

7. The silver-coated copper powder according to claim 1 , which is obtained by attaching a nitrogen (N)-containing surface treating agent having an azo group to the surface of a copper particle and forming a silver layer containing silver or a silver alloy on the surface of the surface-treated copper particle by displacement plating.

8. The silver-coated copper powder according to claim 2 , having a specific surface area of 1.02 m 2 /g to 5.00 m 2 /g.

9. The silver-coated copper powder according to claim 2 , wherein the silver-coated copper particle contains nitrogen (N) dispersively in its silver layer as analyzed by STEM-EDS mapping.

10. The silver-coated copper powder according to claim 3 , wherein the silver-coated copper particle contains nitrogen (N) dispersively in its silver layer as analyzed by STEM-EDS mapping.

11. The silver-coated copper powder according to claim 2 , having a tap density of 0.5 to 3.5 g/cm 3 .

12. The silver-coated copper powder according to claim 3 , having a tap density of 0.5 to 3.5 g/cm 3 .

13. The silver-coated copper powder according to claim 4 , having a tap density of 0.5 to 3.5 g/cm 3 .

14. The silver-coated copper powder according to claim 2 , wherein the silver-coated copper particles having a dendritic shape account for more than 80% of the total number of the particles composing the silver-coated copper powder.

15. The silver-coated copper powder according to claim 3 , wherein the silver-coated copper particles having a dendritic shape account for more than 80% of the total number of the particles composing the silver-coated copper powder.

16. The silver-coated copper powder according to claim 4 , wherein the silver-coated copper particles having a dendritic shape account for more than 80% of the total number of the particles composing the silver-coated copper powder.

17. The silver-coated copper powder according to claim 5 , wherein the silver-coated copper particles having a dendritic shape account for more than 80% of the total number of the particles composing the silver-coated copper powder.

18. The silver-coated copper powder according to claim 2 , which is obtained by attaching a nitrogen (N)-containing surface treating agent having an azo group to the surface of a copper particle and forming a silver layer containing silver or a silver alloy on the surface of the surface-treated copper particle by displacement plating.

19. The silver-coated copper powder according to claim 3 , which is obtained by attaching a nitrogen (N)-containing surface treating agent having an azo group to the surface of a copper particle and forming a silver layer containing silver or a silver alloy on the surface of the surface-treated copper particle by displacement plating.

20. The silver-coated copper powder according to claim 4 , which is obtained by attaching a nitrogen (N)-containing surface treating agent having an azo group to the surface of a copper particle and forming a silver layer containing silver or a silver alloy on the surface of the surface-treated copper particle by displacement plating.

Assignees

• Mitsui Mining & Smelting Co

Inventors

• Morinaka Hiroyuki
• Ochi Kentaro

Classifications

• B22F1/05

  Metallic powder characterised by the size or surface area of the particles · CPC title

• B22F1/145

  Chemical treatment, e.g. passivation or decarburisation · CPC title

• B22F1/06

  Metallic powder characterised by the shape of the particles (nanosized particles B22F1/054) · CPC title

• B22F1/103

  containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent · CPC title

• B22F1/17

  Metallic particles coated with metal · CPC title