Copper power and method for producing same
AssigneeMitsui Mining & Smelting Co., Ltd.
InventorsYoichi Kamikoriyama, Shigeki Nakayama
Life of this patent
Estimating the term…
Abstract
Disclosed is copper powder having an average primary particle size D of 0.15 to 0.6 μm, having a ratio of D to DBET, D/DBET, of 0.8 to 4.0 wherein DBET is a sphere-equivalent average particle diameter calculated from a BET specific surface area, and having no layer for preventing agglomeration on the surface thereof. The copper powder is suitably produced by a method which includes a step of mixing (1) hydrazine and (2) a reactant mixture including a monovalent or divalent copper source and a liquid medium which includes water and an organic solvent having water miscibility and capable of reducing the surface tension of water, to reduce the copper source to form copper particles.
Claims7
Copper powder having a crystallite size of 37 nm or smaller, an average primary particle size D of 0.15 to 0.6 μm, having a ratio of D to DBET (D/DBET) of 0.8 to 4.0, wherein DBET is a sphere-equivalent average particle diameter calculated from a BET specific surface area, and having no layer for preventing agglomeration on the surface thereof.
Dependencies are inferred from the claim text.