Tungsten Oxide

Tungsten plate is a tungsten material pressed by special process, it is mainly used in electronics and semiconductor industry parts manufacturing, tungsten sputtering target, high temperature furnace with tungsten boat, sapphire long furnace components etc. The conventional thin tungsten plate pressing process uses yellow tungsten oxide , because the size distribution of yellow oxide powder is narrow and the particle size of powder is uniform, the gap of particles is not easy to be filled in the process of pressing, which eventually leads to lower strength of pressing. The physical and mechanical properties of the tungsten plate are closely related to the strength of the compact, the strength of compacts is related to the characteristics of tungsten powder morphology and particle size distribution. There are three types of commonly used tungsten trioxide, yellow tungsten oxide, blue tungsten oxide and purple tungsten oxide, its flagship product is divided into three level: ordinary, fi...

  What kind of tungsten oxide can produce high quality cemented carbide? At present, there are yellow tungsten oxide, blue tungsten oxide and violet tungsten oxide which are available in the market. Which kind of raw material is most suitable for cemented carbide production? Violet Tungsten oxide is the best raw material for producing superfine tungsten powder and nanometer metal tungsten powder. Ultrafine tungsten carbide was prepared by ultrafine or nano tungsten powder, and then cemented carbide was produced, the properties and requirements of cemented carbide are better than those made of ordinary. tungsten powder. The alloy with violet tungsten as the raw material has better quality and stronger adaptability, and the violet tungsten can make the penetration capability of the military armour piercing bullet increase by 20%, and the abrasion resistance of the carbide cemented carbide tool can be increased by 12%, etc. The preparation methods of violet tungsten include hydrogen ...

Scientists discovered that VO 2   has a distinctive phase change function long time ago. When the phase transition temperature is 68°C, it can change reversibly from low temperature monoclinic system to high temperature tetragonal system. The physical properties such as resistivity, optical transmittance, permeability and so on have changed greatly. Doping method is an effective method to change the phase transition temperature of VO 2 . The preparation methods of doped VO 2  films include sol-gel doping method, hydrothermal synthesis doping method, sputtering doping method, metal organic compound vapor deposition doping method, pulse laser deposition process, inorganic sol-gel doping method, and microwave plasma method. We prepare it by microwave plasma method. Another main content of the preparation of doped VO 2  thin film is the selected doping compounds. Weigh a certain amount of pure V 2  O 5  powder and W 2 O 3  into the pot, then stirring, put in th...

  Violet tungsten oxide , abbreviated as VTO, is named after the appearance of purple. It is the best raw material for the preparation of ultrafine or nanometer tungsten powder. It is produced in the process of producing ammonium paratungstate under the condition of precise control of temperature reduction. Violet tungsten oxide is mainly used in the production of tungsten powder and tungsten carbide. Violet tungsten oxide sample color can be divided into purple, dark purple, dark blue, blue, the color of violet tungsten oxide and its oxygen index, particle degree of tightness, the aspect ratio of the needle. Some scholars have invented a way to directly control and detect the quality of violet tungsten oxide. The quality of purple tungsten oxide is determined by the unique color of violet tungsten oxide. This method is called "colorimetric method" in the industry. The color of violet tungsten oxide is related to the oxygen index, the degree of tightness of the particles and ...

Nano tungsten oxide is considered to be one of the most promising new oxides gas sensing materials that detects nitrogen oxides, hydrogen sulfide, and acetone and other harmful gases. The preparation methods of nano tungsten oxide mainly include hydrothermal method, sputtering method, sol gel method and gas phase deposition method. Compared with other synthetic methods, as a new method for composing nano-materials, low heating solid phase chemical reaction has the characteristics of simple operation, friendly environment and mild conditions.  Mix sodium tungstate and sodium sulfate for 30min, the sample was placed in a cone bottle and placed for 24h to obtain the precursor. Then put the precursor calcined at 600°C in the muffle furnace 2h, nano tungsten carbide was obtained.  Based on the product of nano tungsten carbide test, the material in the lower working temperature of low concentration acetone gas showed the performance of fast response, high selectivity and high sensi...

Electrochromic is the phenomenon that the optical properties of materials change stably and reversibly under the action of applied electric field. It can cause light penetration through the electric field, changing color with the environment, and no longer need to curtain. WO 3  thin film is one of the most promising electrochromic materials. WO 3  thin films have been widely used in photochromic, photochromic, filter, dye sensitized solar cells and so on.  With the implantation and extraction of ions, the dissolution and ion residues of WO 3  thin films will occur, and the electrochromic properties will decline obviously, which limits the wide use of electrochromic devices. TiO 2  has excellent stability, and has excellent transmittance in wide waveband. The doping of electrochromic films with TiO 2  composite WO 3  can improve the stability and lifetime of devices.  Pure Ti/WO 3  composite films were prepared by radio frequency sputtering m...

Tungstic acid can be roughly divided into yellow tungstic acid and white tungstic acid. More and more practice has shown that tungstic acid not only has an important use in tungsten chemistry, but also has great value in tungsten metallurgy. Powdery white tungstic acid can compose tungsten niobium and tungsten tantalum Heteropoly salt. Tungsten phosphoric acid and tungstic acid can also be composed. The heteropoly acid prepared from powdered white tungstic acid has better catalytic performance than that prepared with tungstic acid.  The preparation of white tungstic acid is to drop Na 2 WO 4  solution into dilute acid. In the middle of the process, there is no acid anion, so the precipitation rate is high. In the Na 2 WO 4  solution tungsten exists as monomeric WO42-form. The presence of dilute acid immediately results in protonation and formation of tungstic acid precipitation. Generally, the prepared white tungstic acid is a mixture of mono - tungstic acid and poly - t...