Tungsten Oxide

Ultra coarse tungsten powder is an important raw material for the preparation of ultra coarse tungsten carbide. Compared with ultrafine tungsten powder, it has a series of advantages, such as less high-temperature defects, higher microhardness and smaller micro strain. The common process of reduction of ultra coarse tungsten powder by ammonium paratungstate is usually the reduction of ammonium paratungstate into blue tungsten or yellow tungsten, and then by hydrogen reduction furnace. The tungsten powder prepared by this method is regular polycrystalline, and the particle size is mostly controlled between 2 microns and 5 microns, and the powder size is moderate. In order to prepare ultra coarse tungsten powder, Li or Na was added to tungsten oxide, as far as the average degree of tungsten powder is concerned, the process of adding Li to ammonium paratungstate is the most effective, but there is a large amount of residue in the powder; At the same time, studies have shown that adding a ...

With the development of alloy industry, there is also a polarizing demand for tungsten powder. Not only has ultrafine tungsten powder, but also has ultra coarse tungsten powder. In industrial production, ultrafine tungsten powder is widely used, and the preparation of ultrafine tungsten powder is complicated. Therefore, it has been studied more. However, ultra coarse tungsten powder also has a specific use.  Ultra coarse tungsten powder is a coarser tungsten powder with a particle size greater than 20 microns. It has the advantages of good strength and toughness. It is widely used in the field of oil drilling, mining tools, stamping die, hard material etc. How to prepare ultra coarse tungsten? Just reverse the thinking of preparing ultrafine tungsten powder. The traditional scheme of preparing ultra coarse tungsten powder is based on the preparation of ultrafine tungsten powder as negative teaching material. 1. Try to improve fisher particle size of...