Tungsten powder is powdered metal tungsten, which is the materials of preparing tungsten processing materials, tungsten alloy and tungsten products. Tungsten powder is the main material of processing powder metallurgy tungsten products and tungsten alloy. Pure tungsten powder can be made into silk, rods, tubes, plates and other processing material and a certain shape of products. When tungsten powder is be mixed with other metal powder, it can be made into all kinds of tungsten alloy, such as tungsten molybdenum alloy, tungsten copper alloy and high density tungsten alloy. Another important application of tungsten powder is making into tungsten carbide powder and preparing cemented carbide tools, such as turning tool, milling cutter, drill bits and mould. With the development of high-speed machining technology, tungsten carbide sintering cemented carbide can’t meet the requirements and has a tendency of being replaced by other hard alloy. As a cutting tool, a cobalt sintered tungsten carbide composite material is a kind of antiwear composite material of the most successful application. It has decades of history. To further improve the hardness of a cobalt tungsten carbide composite material and not reduce its toughness is an important subject in the field of cemented carbide.

 

To take advantage of existing production equipment, raw materials and parts of technical route, this paper introduces the method of sodium tungstate preparing tungsten nano-Particles. 

1. Use sol-gel method to prepare tungstic acid gel. Then filtering, 160℃drying, 600℃calcining to remove the water of crystallization and restore it  in reducing furnace by hydrogen reduction. Finally, tungsten powder can be obtained. 

2. Use CMC hydrolysis solution as the reaction medium, tungsten acid sodium as pioneer to react with hydrochloric acid to produce tungsten acid gel. After the completion of the reaction, start the aging treatment. And then filtering, 160℃drying, 600℃calcining to remove the water of crystallization and restore it in reducing furnace by hydrogen reduction. Finally, tungsten powder can be obtained. 

 

This method is added a little improvement which is based on the traditional tungsten powder manufacturing process. The reaction of sodium tungstate and hydrochloric acid producing tungsten acid sol-gel can produce nanometer tungsten particles. And manufacturing tungstic acid sol can be done in other hydrolysis medium viscosity. By this way, the obtained nanoparticles have a smaller size.