Patent ID: 6878182

Claim:
A method of making cemented carbide bodies based on tungsten carbide and with a binder phase based on Co or combinations of Co, Ni, and Fe, or Ni and Fe by powder metallurgical methods, the method comprising: wet milling in alcohol, water, or a mixture thereof, powder and pressing agent to form a slurry; drying the slurry to form a granulate by spray drying; pressing the granulate to form bodies of desired shape and dimension; and sintering; wherein the slurry is formulated to contain 0.02-0.06 wt % of a polyethylenimine-based polyelectrolyte to the cemented carbide slurry containing WC and Co with up to 1 wt % in total of the raw material weight comprising TaC, NbC, TiC, or mixtures thereof.