Method of improving the weatherability of copper powder

Details Method of improving the weatherability of copper powder Method of improving the weatherability of copper powder

2011-03-22

2011-03-22

King, Roy (Department: 1733)

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

Reexamination Certificate

active

07909908

ABSTRACT:
A copper powder that is excellent in weatherability and adapted for use in conductive paste is provided that contains 10-20,000 ppm, preferably 100-2,000 ppm, of Sn. The copper powder is particularly preferably one having an average particle diameter DM of 0.1-2 μm and, further, one wherein the particle diameter of at least 80% of all particles is in the range of 0.5 DM-1.5 DM. This copper powder can be produced, for example, by precipitating Cu metal by reduction of Cu ions in the presence of Sn ions.

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