Tungsten trioxide product series

Tungsten trioxide

Tungsten trioxide, chemical formula: WO3, is the oxide of tungsten (VI), which is an important intermediate of tungsten industry from tungsten ore.  Yellow powder, melting point: 1472℃, relative density (water =1) 7.16, boiling point 1837℃;  Insoluble in water, soluble in lye, slightly soluble in acid.  It can be obtained by adding acid after eumelting tungsten ore and soda.  

Tungsten trioxide is mainly used for calcination and reduction to produce tungsten powder and tungsten carbide powder, and then used in the production of cemented carbide products, such as the manufacture of tools and molds.  Also can be used to manufacture pure tungsten products, tungsten bar, tungsten wire, tungsten electrode;  And uses for weight and radiation shielding materials.  A small amount is also used in industrial production as a colorant for yellow ceramics.  Tungsten oxide of tungsten is used as an important anticorrosive paint and coating material in shipbuilding industry.  

Ditungsten trioxide

Tungsten trioxide is actually tungsten trioxide, its molecular structure is similar to aluminum trioxide, can be used to make better performance of laser emission source;  As a cocatalyst, in SCR denitrification catalyst to play the role of resistance to carrier sintering, alkali metal and sulfur poisoning, so as to improve the denitrification efficiency;  As a photocatalyst, iron-doped tungsten trioxide has several times higher uv and visible light catalytic activity than tungsten trioxide and iron oxide alone.  

Ortho tungsten trioxide

The structure of tungsten trioxide changes with the temperature, forming a variety of crystal phases, such as tetragonal phase (above 740°C), orthotropic phase (330-740°C), monoclinic phase (17-330°C), triclinic phase (-50-17°C), etc.  Nanomaterials, especially some metastable phases, can be prepared by hydrothermal synthesis under relatively mild conditions.  By controlling temperature, concentration, pH value and other conditions, orthonormal tungsten trioxide can be obtained by using different precursors and regulators in hydrothermal synthesis.  

Hexagonal phase tungsten trioxide

Hexagonal phase tungsten trioxide has a layered structure. Each layer of octahedron is connected at a fixed point to form a six-membered ring, which will form a one-dimensional hexagonal channel in the direction of its crystal axis.  In addition, adjacent six-membered rings form a triangle with each other, which also forms a one-dimensional three-way channel.  Many metal ions can be embedded into its special hexagonal channels to form hexagonal tungsten bronze, which shows great application prospect in cathode materials and rechargeable lithium ion batteries.  In addition, hexagonal tungsten trioxide nanomaterials can be applied to photocatalytic degradation of organic matter.  

Hexagonal tungsten trioxide is a kind of stable crystal phase, its preparation process is generally mild, can be synthesized from sodium tungstate and hydrochloric acid as raw materials, potassium oxalate and potassium sulfate as additives, respectively, by hydrothermal method. 

Nano tungsten trioxide

Nano-tungsten trioxide is a kind of tungsten trioxide particles whose particle size is less than 100 nanometers in one dimension, which is an important industrial raw material.  Nano-tungsten trioxide is a good catalyst with large specific surface area and significant surface effect.  The electromagnetic wave has a strong absorption capacity, in the use of solar energy can be used as an excellent absorption material, in the military can be used as an important stealth material;  As a transition metal compound, nano-tungsten trioxide also has semiconductor properties and is a potential sensitive material, sensitive to hydrogen sulfide, ammonia and other gases.  In addition, nanometer tungsten trioxide is a kind of multifunctional semiconductor material with electrochromism, gas chromism, photochromism and superconductivity.  

Tungsten trioxide ceramics

Tungsten trioxide (WO3) is a very important high-tech material, which has the characteristics of nonlinear, high dielectric constant, electrochromic, gas detection, chemical catalysis and so on.  Using these characteristics of WO3, the nano powder can be fired into piezoresistive ceramics, ceramic capacitors, photochromic ceramic films, gas sensitive ceramics, photocatalytic degradation ceramic films, battery electrode ceramic materials, microwave absorption ceramic films, new high temperature thermoelectric ceramics and their films and other functional ceramics and ceramic films.  It has great application potential in many fields such as chemical industry, energy and electric power.  

There are generally two methods for the preparation of raw materials used in ceramic products, namely mechanical crushing method and synthetic method.  The former one uses mechanical principle to break coarse particles to obtain fine powder, which has the advantages of large production and low cost, but there are problems of impurity mixing in the process of crushing, and it is difficult to make sub-micron particle size;  The powder prepared by synthetic method has high purity, small particle size and good uniformity of composition, which is suitable for advanced ceramic materials with high performance requirements and low yield.  

Tungsten trioxide target

Tungsten trioxide thin film is an important functional material and is used in systems because of its excellent electrochromic properties.  WO3 powder and WO3 target are commonly used to prepare WO3 films for chromic use by electron beam evaporation.  At present, WO3 powder is widely used as the evaporation material, but it is usually inappropriate to use the powder form. It is an optimal scheme to choose tungsten trioxide target as the evaporation material.  

The preparation of tungsten trioxide target material adopts the general preparation method of electronic ceramics, and its technological process is generally: ball milling and mixing - pressing forming - sintering.  In the process of preparation, the quality of raw materials will have a decisive influence on the final properties of ceramics.  Common preparation methods of tungsten trioxide target include solid phase, gas phase and liquid phase.  

Tungsten trioxide catalyst

Tungsten trioxide is an important semiconductor material with catalytic properties. Tungsten trioxide catalyst is widely used in hydrodesulfurization, SCR denitrification, photocatalysis and other aspects.  

Tungsten trioxide shielding material

Tungsten trioxide has good absorption and shielding effect on electromagnetic waves. Studies show that when tungsten or lead with the same thickness shields electrons, tungsten deposits more energy and the shielding effect is obviously better than lead.  Tungsten trioxide shielding material can be used in medical shielding.  It can also be made into metal fiber anti-radiation clothing, which has the advantages of good air permeability, washing, high shielding effect and no side effects on the human body.  

Metal fiber radiation protection suit is the third generation of radiation protection products in the development history of radiation protection suit.  Using tungsten oxide fiber and cotton fiber blending process, that is, the tungsten oxide is pumped into fine wire, in the fabric inside the formation of a network structure.  The mesh reflects electromagnetic waves, and when the mesh's aperture is less than a quarter of the wavelength of the electromagnetic wave (wavelength = light speed/frequency), it effectively blocks electromagnetic radiation out of the body.