Tungsten Oxide

Plasma is considered to be the fourth basic form of solid, liquid, gas and other substances.  It is a collection of charged particles and neutral particles that are freely moving and interact with each other. Macroscopically, it is electrically neutral. When there is enough energy added to the gas, the gas molecules and high-energy electrons will occur between the collision or absorption of electromagnetic control and ionization process occurred, and then the formation of plasma state. The basic principle of plasma preparation of ultrafine tungsten powder is in an inert atmosphere or reactive atmosphere, the DC discharge (or otherwise) to produce high temperature gas ionization plasma, so that the molten metal evaporation, metal vapor, quenching or chemical reaction to form ultrafine particles. At present, the main methods to obtain plasma are thermal ionization method, shock wave method, photoionization method, ray radiation method, and DC, low-frequency, radio fr...

The thermal degradation method is a process for the preparation of ammonium metatungstate based on ammonium paratungstate (APT). This method is also the mainstream process of preparing ammonium metatungstate (AMT). At present, China's industrial use of pyrolysis equipment is mainly rotary calciner, at the same time, there are a number of applications in other countries for AMT patented pyrolysis equipment, microwave heating furnace is one of them. Because the microwave energy level is close to the vibrational level of the water molecule, the hydrous material can dehydrate rapidly under the microwave field, which is also the working principle of the microwave heating furnace. Microwave heating furnace operating characteristics are: 1. Uniform and fast, which is the main characteristics of microwave drying. As the microwave has a large penetration capacity, heating can be generated directly within the medium heat, and the drying speed; 2. Selective, microwave heating...

Blue Tungsten Oxide  is one of the important raw materials for making tungsten powder. As an important intermediate of tungsten in modern industry, it has been popular for many years.  If you have any inquiry of  tungsten , please feel free to contact us: Email:  sales@chinatungsten.com / sales@xiamentungsten.com Tel.: +86 592 5129696/+86 592 5129595 Fax: +86 592 5129797 Scan QR code of Chinatungsten Wechat platform to follow up the daily latest price and market of tungsten, molybdenum and rare earth.

Blue tungsten oxide is one of the important raw materials for making tungsten powder.  Compared with yellow tungsten, blue tungsten oxide is easy to be doped because of its good activity and large specific surface. It can maintain its original crystalline shape and has been widely used as an upgraded version of yellow tungsten oxide.  There are three main methods for the preparation of blue tungsten oxide. APT closed calcination method, APT hydrogen mild reduction method, internal reduction. Internal reduction method was proposed by scholars in Fudan University in 1981.  Internal reduction method by means of an internal component of the tungsten compound to make reduction of W. Intrinsic reduced tungstate was synthesized with APT as raw material (Intramo - lecularly Reduching Tunnstate). It has thermal decomposition in an inert atmosphere, blue tungsten oxide with simple phase composition, large specific surface and h...

The performance of tungsten oxide materials will directly affect the reduction behavior of tungsten powder and the final product performance. Therefore, on which material is most suitable for the production of ultrafine tungsten powder has been the subject of much attention in material science workers. Blue tungsten oxide and purple tungsten oxide is the main raw material for production of ultrafine tungsten powder, blue tungsten oxide originated in the last century 70's, mainly WO 2.90 , W 20 O 58  and ammonium tungsten bronze (ATB) mixture. Purple Tungsten oxide is a kind of tungsten oxide product developed in recent years in China. Its phase composition is WO 2.72  or W 18 O 49 . Blue tungsten is present through hydrogen reduction of raw materials prepared by tungsten powder is the most widely used, as long as the conditions of low temperature, dry hydrogen, high hydrogen flow, thin material layer, producing ultrafine tungsten powder method can restore t...