Production of fine particle copper powders
OwnerGang Zhao, Michael P. Pompeoinventors
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Abstract
A process for producing sub-micron-sized copper powder comprising the steps of: providing a precursor composition comprising a solution of copper monoethanolamine complex; and heating the precursor composition to a temperature wherein copper monoethanolamine complex is converted to copper powder. A process for producing nickel powder comprising the steps of: providing a precursor composition comprising a solution of nickel monoethanolamine complex; and heating the precursor composition to a temperature wherein nickel monoethanolamine complex is converted to nickel powder.
Claims42
A process for producing micron-sized to sub-micron-sized copper powder comprising the steps of:
- 1) providing an aqueous precursor composition comprising a solution of more than 5% copper ions, more than 10% water, and more than 20% monoethanolamine, by weight, with the proviso that there is less than 0.8 moles of a low molecular weight organic acid selected from the group consisting of formic acid, acetic acid, and oxalic acid per mole of copper ions;
- and 2) heating the precursor composition to a temperature wherein the copper ions are converted to copper powder, said powder having greater than 90% by weight copper and having a mean diameter of between about 0.02 microns and about 5 microns.
A process for producing micron-sized to sub-micron-sized copper powder comprising the steps of:
- 1) providing a precursor composition comprising at least 10% water by weight, copper ions and monoethanolamine, with the proviso that the mole ratio of ethanolamine to copper ions is at least 1 and there is less than 0.4 moles total of a low molecular weight organic acid and hydrazine per mole of copper ions, wherein the low molecular weight organic acid has a molecular weight equal to or less than that of oxalic acid ;
- and 2) heating the precursor composition to a temperature wherein the copper ions are converted to copper powder, said powder having greater than 90% by weight copper and having a mean diameter of between about 0.02 microns and about 5 microns.
A process for producing micron-sized to sub-micron-sized copper powder comprising the steps of:
- 1) providing a precursor composition consisting essentially of copper ions, monoethanolamine, an inorganic counterion, at least 10% by weight of water, and optionally an reducing sugar, wherein the mole ratio of monoethanolamine to copper ions is at least 1:1;
- and 2) heating the precursor composition to a temperature wherein copper ions are converted to copper powder, said powder having greater than 90% by weight copper and having a mean diameter of between about 0.02 microns and about 5 microns.
A process for producing micron-sized to sub-micron-sized metal powder comprising the steps of:
- 1) providing a precursor composition comprising at least 10% by weight of water, monoethanolamine-reducible metal ions and monoethanolamine, wherein the monoethanolamine-reducible metal ions each have a standard reduction potential from about −0.30 volts to about 0.6 volts in water solution at 25° C., and wherein the mole ratio of monoethanolamine to monoethanolamine-reducible metal ions is at least 1:1, with the proviso that the precursor composition comprises less than 0.8 moles total of metal-reducing-organic acids and of hydrazine per mole of monoethanolamine-reducible metal ions;
- and 2) heating the precursor composition to a temperature wherein the metal ions are converted to metal powder, said powder having a mean diameter of between about 0.02 microns and about 5 microns.
A process for producing micron-sized to sub-micron-sized nickel powder comprising the steps of:
- 1) providing a precursor composition comprising more than 10% by weight of water, nickel ions and monoethanolamine, wherein the mole ratio of monoethanolamine to nickel ions is at least 1:1, with the proviso that the precursor composition comprises less than 0.8 moles total of nickel-reducing-organic acids and of hydrazine per mole of monoethanolamine-reducible nickel ions and 2) heating the precursor composition to a temperature wherein the nickel monoethanolamine complex is converted to nickel powder.
Dependencies are inferred from the claim text.