Fine powder of metallic copper and process for producing the...

Details Fine powder of metallic copper and process for producing the... Fine powder of metallic copper and process for producing the...

2005-03-22

2005-03-22

Mai, Ngoclan T. (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Processes

Producing solid particulate free metal directly from liquid...

Reexamination Certificate

active

06869461

ABSTRACT:
A fine powder of metallic copper, suitable as a material for electroconductive pastes, and having a BET diameter of 3 μm or less, large crystallite size, high dispersibility and particles of high sphericity and a process for producing the same. More specifically, a fine powder of metallic copper having a BET diameter of 3 μm or less, particles of high sphericity and crystallites of 0.1 to 10 μm in size, and more preferably containing oxygen at 0.3% by weight or less. Moreover, the fine powder of metallic copper can be produced stably and efficiently by blowing an ammonia-containing gas onto molten copper kept at 1120° C. More specifically, it can be produced more stably and efficiently by blowing ammonia at 0.015 L/minute or more per unit area (cm2) of the molten copper.

REFERENCES:
patent: 3565604 (1971-02-01), Akimoto et al.
patent: 63-31522 (1988-06-01), None
patent: 2-57623 (1990-02-01), None
patent: 2002-20809 (2002-01-01), None
patent: WO 9716275 (1997-05-01), None

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