Coated cobalt powder and preparation method thereof

Abstract

Provided are a coated cobalt powder and a preparation method thereof, the coated cobalt powder consisting of cobalt powder, and paraffin wax, polyethylene glycol or polyethylene coated on the outer surface of the cobalt powder. Using the coated cobalt powder to replace traditional cobalt powder as the raw material for preparing hard alloys, the dusts generated during production can be reduced, and the environment in a production shop can be improved; simultaneously, the paraffin wax, the polyethylene glycol or the polyethylene coated on the surface of the cobalt powder can effectively prevent the cobalt powder from being oxidized by the oxygen or water vapor in the air, thus improving the quality of the cobalt powder. The preparation process of the coated cobalt powder is free from contamination and the coated cobalt powder is suitable for industrialized production.

1 . Coated cobalt powder, wherein consisting of
 cobalt powder, and   paraffin wax, polyethylene glycol or polyethylene coated on the outer surface of the cobalt powder;   said paraffin wax, polyethylene glycol or polyethylene is in an amount of 1.5% to 2.5% by weight of said cobalt powder.   
     
     
         2 . The cobalt powder according to  claim 1 , wherein said paraffin wax, polyethylene glycol or polyethylene is in an amount of 2% by weight of said cobalt powder. 
     
     
         3 . A method for preparing coated cobalt powder, comprising:
 providing cobalt powder and paraffin wax in an amount of 1.5% to 2.5% by weight of cobalt powder;   pouring paraffin wax into organic solvent then dissolving and forming paraffin wax-organic solvent mixture;   adding paraffin wax-organic solvent mixture into cobalt powder, placing into planetary mixer for stirring and mixing, vacuum drying to obtain waxed cobalt powder.   
     
     
         4 . The method for preparing coated cobalt powder according to  claim 3 , wherein said organic solvent is n-hexane, n-heptane, methylbenzene or ethyl acetate. 
     
     
         5 . The method for preparing coated cobalt powder according to  claim 4 , wherein solid-liquid ratio of said cobalt powder to ethyl acetate is in the range of 20 to 50:1. 
     
     
         6 . The method for preparing coated cobalt powder according to  claim 3 , wherein the stirring and mixing is carried out at a stirring speed in the range of 40 to 100 r/min for 1 to 5 h. 
     
     
         7 . A method for preparing coated cobalt powder, comprising:
 providing cobalt powder and paraffin wax in an amount of 1.5% to 2.5% by weight of cobalt powder;   placing into planetary mixer, stirring and mixing under the protection of vacuum or nitrogen to obtain waxed cobalt powder;   or   providing cobalt powder, and polyethylene glycol or polyethylene in an amount of 1.5% to 2.5% by weight of cobalt powder;   placing into planetary mixer, vacuum drying to obtain cobalt powder coated with polyethylene glycol, or cobalt powder coated with polyethylene;   wherein the coated cobalt powder consists of cobalt powder, and paraffin wax, polyethylene glycol or polyethylene coated on the outer surface of the cobalt powder; said paraffin wax, polyethylene glycol or polyethylene is in an amount of 1.5% to 2.5% by weight of said cobalt powder.   
     
     
         8 . The method for preparing coated cobalt powder according to  claim 7 , wherein in the step of obtaining waxed cobalt powder, the stirring and mixing is carried out at a temperature in the range of 55 to 60° C. 
     
     
         9 . The method for preparing coated cobalt powder according to  claim 7 , wherein the stirring and mixing is carried out at a stirring speed in the range of 40 to 100 r/min for 1 to 5 h. 
     
     
         10 . (canceled)