Method for preparing micro-fine and nanometer particle tungsten carbide

Abstract

The invention relates to a method for preparing micro-fine and nanometer particle tungsten carbide. The method is characterized by comprising the following steps: mixing 800-2500 kg of tungsten powder by weight with carbon black accounting for 5.90-6.3 percent of the total weight, charging into a boat after blending carbon for 20-60 min, wherein the boat charging amount is 3-7 kg and the boat pushing speed is 6-10 min / boat, and then carbonizing through a hydrogen infusing molybdenum wire furnace, simultaneously controlling the hydrogen flow of the hydrogen infusing molybdenum wire furnace to be 1.0-2.5 m<3> / h, wherein the temperature inside the furnace is 1100-1350 DEG C, and then crushing the tungsten carbide block by using an air stream crushing system and dispersing into tungsten carbide powder. The invention has the following advantages: firstly, the method shortens the production time and controls the production process more stably; secondly, the little uncrushed or aggregate particles exist in the prepared tungsten carbide powder is very, and the granularity distribution is centralized uniformly; thirdly, single batch 800-2500 kg of scale production can be adjusted, the single batch is larger, and the product has better stability; and fourthly, the method is used for producing high-performance nanometer crystal, super-fine crystal and micro-fine crystal hard alloy with prior quality, and controls the alloy production process stably.

Description

technical field [0001] The invention relates to a preparation method of tungsten carbide, in particular to a preparation method of fine and nano particle tungsten carbide which improves labor efficiency and output rate. Background technique [0002] The nanoscale, ultrafine and microparticle tungsten carbide powders commonly produced in the market are mixed with carbon black and carbon black respectively, usually for 3 to 6 hours, and sometimes various additives are added. It is produced by carbonization equipment such as carbon tube furnace or molybdenum wire furnace, and then crushed with a ball mill, usually for 3 to 6 hours, and then sieved to obtain fine tungsten carbide powder products. The tungsten carbide powder produced by this method has many unbroken or agglomerated particles, the particle size distribution is not uniform and concentrated, some impurities are high, and the single batch of large-scale production is small, generally 200-300kg, and the product is sta...

AI Technical Summary

Problems solved by technology

The tungsten carbide powder produced by this method has many unbroken or agglomerated particles, the particle size distribution is not uniform and concentrated, some impurities are high, and the single batch of large-scale production is small, generally 200-300kg, and the product is stable. poor

Production of high-performance nanocrystalline, ultrafine and microcrystalline cemented carbides with unstable quality