Powder mixture or composite powder, a method for production thereof and the use thereof in composite materials
AssigneeH.C. Starck GmbH
InventorsBernd Mende, Gerhard Gille, Ines Lamprecht
Life of this patent
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Abstract
A process is described for the preparation of powder mixtures or composite powders from at least one first type of powder from the group consisting of high-melting metals, hard materials and ceramic powders and at least one second type of powder from the group consisting of binder metals, binder-metal mixed crystals and binder-metal alloys, where the second type of powder is formed from precursor compounds in the form of water-soluble salts in an aqueous suspension of the first type of powder by precipitation as oxalate, removal of the mother liquor and reduction to the metal.
Claims17
A process for the preparation of powder mixtures or composite powders comprising,
- at least one first type of powder selected from the group consisting of high-melting metals having a melting temperature that is at least 2000° C., hard materials and ceramic powders, and
- at least one second type of powder selected from the group consisting of binder metals, binder-metal mixed crystals and binder-metal alloys,
- wherein the second type of powder is formed from a precursor compound selected from the group consisting of water-soluble compounds of Co, Ni, Fe, Cu Sn and combinations thereof in the form of water-soluble salts in an aqueous suspension of the first type of powder by precipitation as oxalate, removal of the mother liquor and reduction of the metal,
- further wherein the first type of powder is initially introduced in aqueous suspension containing the precursor compound of the second type of powder in the form of dissolved salts, and a solution is added to the suspension, said solution being selected from the group consisting of oxalate solution, oxalic acid solution and combinations thereof.
A process for the preparation of powder mixtures or composite powders comprising,
- at least one first type of powder selected from the group consisting of high-melting metals having a melting temperature that is at least 2000° C., hard materials and ceramic powders, and
- at least one second type of powder selected from the group consisting of binder metals, binder-metal mixed crystals and binder-metal alloys,
- wherein the second type of powder is formed from a precursor compound selected from the group consisting of water-soluble compounds of Co, Ni, Fe, Cu, Sn and combinations thereof in the form of water-soluble salts in an aqueous suspension of the first type of powder by precipitation as oxalate, removal of the mother liquor and reduction of the metal,
- further wherein the first type of powder is suspended in a solution selected from the group consisting of oxalate solution, oxalic acid solution and combinations thereof, and the precursor compound of the second type of powder is added to the suspension in the form of a solution of its water-soluble salts.
Dependencies are inferred from the claim text.