Method for preparing superfine tungsten carbide powder

Abstract

The invention discloses a method for preparing superfine tungsten carbide powder. The method comprises the following steps: proportioning tungsten powder and carbon black according to a mass ratio of1: (1 to 1.5), then adding mixed powder of nickel powder and cobalt powder which accounts for 10 to 15 percent of the total mass of the tungsten powder and the carbon black, and preparing a mixed rawmaterial; loading the mixed raw material into a ball milling tank of a ball milling machine, adding a grinding ball, and protecting the ball milling tank with inert gas or vacuuming the ball milling tank; placing the ball milling tank into a hearth of the ball milling machine, and then starting the ball milling machine to ball-milling the mixed raw material; heating the hearth with the ball milling tank to 700 to 800 DEG C, and preserving the heat of the hearth for 60 to 80 hours; and stopping the ball milling machine, cooling the hearth to room temperature, and taking out the ball milling tank, thus obtaining the superfine tungsten carbide powder with uniform granularity. The method not only has the advantages of simple process, less energy consumption, and low cost, but also can shortenthe reaction time, and has high industrial value.

Description

technical field [0001] The invention belongs to the technical field of tungsten carbide-based cemented carbide, and in particular relates to a method for preparing superfine tungsten carbide powder. 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 significance for the preparation of ultra-fine tungsten carbid...

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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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