Patent ID: 6887296

Claim:
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 2000Â° 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.