초록 ▼

According to the present invention there is now provided a method for preparing a powder containing W and Co and/or Ni characterized in reacting APT and a soluble salt of Co (Ni) in water at temperatures from room temperature to the boiling point of the solution keeping the solution pH at a constant

According to the present invention there is now provided a method for preparing a powder containing W and Co and/or Ni characterized in reacting APT and a soluble salt of Co (Ni) in water at temperatures from room temperature to the boiling point of the solution keeping the solution pH at a constant level during the chemical reactions. The powder is filtered off, dried and reduced to a metallic powder which may be further carburized to form a powder containing WC and Co and/or Ni.

대표청구항 ▼

A method of preparing a powder comprising tungsten and cobalt and optionally nickel, said method comprising mixing ammoniumparatungstate and a soluble salt comprising cobalt acetate and optionally nickel in water to form a suspension thereof, reacting the suspension at a temperature from ambient to

A method of preparing a powder comprising tungsten and cobalt and optionally nickel, said method comprising mixing ammoniumparatungstate and a soluble salt comprising cobalt acetate and optionally nickel in water to form a suspension thereof, reacting the suspension at a temperature from ambient to the boiling point of the suspension under agitation and at a pH level of 5.5±0.5 to form a precipitate powder of tungsten and cobalt and/or nickel, and removing the precipitate from the suspension, wherein said cobalt acetate keeps the pH level constant during the reacting steps.