Method for preparing nano-stage tungsten carbide powder

Abstract

The invention discloses a nano-tungsten carbide powder (particle size is less than or equal to 0.2Mum, carbon compound Cc is more than or equal to 6.10%) preparation method. The preparation takes nano-tungsten (particle size is less than or equal to 0.2Mum) powder and nano-carbon black as materials and comprises a plurality of steps: put the nano-tungsten powder and nano-carbon black into a container; pass the inert gas in the container and mix and stir nano-tungsten powder and nano-carbon black in a state of inert gas the protection; in mixing, add 0.5-3% organic and active materials; after the mixed powder is uniformly mixed, press the mixed powder into pieces under the pressure of 500kg / cm2 -- 1500kg / cm 2 and calcine the pressed pieces (W+C) to make the nano-tungsten powder and tungsten carbide nano-carbon black form tungsten carbide(WC); after the formation of tungsten carbide(WC), adopt the method of airflow grinding to grind and break up the tungsten carbide into nano-tungsten carbide powder. The method has advantages of short technological process, small investment, high yield and great improvement for production quality and stability and is an environment-friendly preparation method.

Description

technical field [0001] The invention belongs to metal smelting technology, and in particular relates to a method for preparing high-performance nanoscale tungsten carbide powder (particle size≤0.2 micron, combined carbon Cc≥6.10%) on an industrial scale. Background technique [0002] Tungsten is one of the most refractory metals, with a melting point as high as 3410°C. It has high hardness, strong ductility, and is not eroded by air at room temperature. Because of these characteristics of tungsten, tungsten powder can be used in a wide range of applications. For example, it can be used to prepare heavy alloy. It is used in automatic watch pendulums, telecommunication vibrators, aircraft balance boards, anti-x-rays, alpha-rays, gamma-ray protection boards, etc.; it can also be used in the preparation of electrical alloys, such as high-voltage contacts, etc. Tungsten carbide powder is an important raw material for making alloys. Cemented carbide prepared from tungsten carbide...

AI Technical Summary

Problems solved by technology

However, these methods have long process flow, large equipment investment, low production capacity, high energy consumption, difficult control of total carbon content, low combined carbon content, low purity, poor product quality stability, and in the production process, harmful gases such as carbon monoxide and HCl Discharge, easy to cause environmental pollution, and there is no way to achieve industrial production of nano-tungsten carbide powder