Method of utilizing tungsten powder and nickel powder as raw materials to prepare superfine tungsten carbide powder

Abstract

The invention discloses a method of utilizing tungsten powder and nickel powder as raw materials to prepare superfine tungsten carbide powder. The method comprises the steps: matching the tungsten powder and carbon black according to the matter amount ratio of 1 to (1 to 1.5) and then adding the nickel powder of 5 to 8% of the total mass fraction of the tungsten powder and the carbon black to prepare a mixed raw material; putting the mixed raw material into a ball milling tank of a ball milling machine, then adding a grinding ball and performing inert gas protection or vacuumizing treatment onthe ball milling tank; putting the ball milling tank into a hearth of the ball milling machine and starting the ball milling machine to ball mill the mixed raw material; warming the hearth which theball milling tank is arranged into to 750 to 850 DEG C and keeping the hearth warm for 50 to 80 hours; shutting down the ball milling machine, cooling the hearth to the room temperature and taking theball milling tank out to obtain the superfine tungsten carbide powder with uniform granularity. The method disclosed by the invention not only has the advantages of simple technology, low energy consumption and low cost, but also can shorten reaction time; thus, the method has very high industrial value.

Description

technical field [0001] The invention belongs to the technical field of tungsten carbide-based hard alloys, and in particular relates to a method for preparing superfine tungsten carbide powder by using tungsten powder and nickel powder as raw materials. Background technique [0002] With the rapid development of science and technology, the demand for cemented carbide in industrial production and people's daily life is increasing day by day. Ultra-fine tungsten carbide (WC), as the most widely used cemented carbide material, not only has high hardness and good wear resistance, but also has high strength and toughness, so it is widely used in the field of difficult-to-cut machining. And in fact, when all other conditions are equal, every property of tungsten carbide-based cemented carbide, such as hardness, modulus, wear resistance, compressive strength, etc., decreases with the average particle size of tungsten carbide powder. Small and strong, so it has far-reaching signifi...

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Problems solved by technology

[0003] At present, the production process of ultra-fine tungsten carbide powder widely used in industry is mainly tungsten oxide hydrogen reduction carbonization method and high-energy ball milling method; while the tungsten oxide hydrogen reduction carbonization method needs to pass hydrogen gas into the high temperature furnace to reduce tungsten trioxide to tungsten powder, then mix tungsten powder and carbon black according to the same mass ratio, and carbonize in hydrogen atmosphere, the carbonization temperature is 1400-1600℃, this method has complicated process, high energy consumption and high cost; while the high energy ball milling method needs to After the tungsten powder and carbon powder are evenly mixed, put them into a high-energy ball mill with a speed of up to 800r / min for long-term ball milling, and this method requires a high speed of the ball mill, and the efficiency of the ball mill to crush WC powder is low, so it takes a long time for crushing Time, the particle size distribution of the product is difficult to control, which affects the powder performance

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