Method of preparing powders for hard materials from cobalt salts and soluble tungstate salts
AssigneeSandvik AB
InventorsIngmar Grenthe, Mamoun Muhammed, Sverker Wahlberg
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Abstract
There is disclosed a method for preparing a powder containing ammonium salts of W+Co(Ni) complex ions, through chemical reactions, in a water solution at temperatures from 70.degree. C. to the boiling point and at pH around neutral, between tungstate salts and cobalt (nickel) salts characterized in that said tungstate salts are the highly soluble sodium tungstate or ammonium metatungstate.
Claims6
A method of preparing a powder containing tungsten and cobalt and/or nickel comprising mixing an aqueous solution of sodium tungstate, and a cobalt and/or nickel salt, adding ammonium acetate to the solution, reacting the mixture at a temperature of from about 70.degree. C. to the boiling point of the solution, cooling the solution whereby a fine green powder, containing ammonium salts of W+Co(Ni) complex ions, precipitates on cooling and removing the precipitate from the solution.
Dependencies are inferred from the claim text.