Tungsten

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New Production Process of Tungstic Acid 129

Tungstic acid is made of artificial white tungsten (CaWO4) and concentrated acid under heating and cooking conditions. Artificial white tungsten is prepared by removing molybdenum (Mo) from industrial sodium tungstate solution by sodium sulfide method and adding calcium chloride. If the process is not treated by the sodium sulfide method, there will be no molybdenum removal effect, and the sodium sulfide method for removing molybdenum is more troublesome. Because the process needs to be produced under high temperature and high…

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The Preparation Method of the Tungsten Disulfide Nanoparticle 224

There are many preparation?methods of tungsten disulfide nanoparticles. Tungsten disulfide is ?two-dimensional material with layered structure?and has excellent semiconductivity and diamagnetism. It is insoluble in acid, alkali and alcohol, and has certain reducibility, which?can react with aqua regia, nitric acid and hot concentrated sulfuric acid, and is able to?be oxidized to WO3 in air and oxygen atmosphere. The structure of tungsten disulfide is similar to that of molybdenum disulfide, the preparation is?different. Molybdenum disulfide can be prepared by flotation from…

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Application of Tungsten Disulfide 215

Tungsten?disulfide has wide application and is the compound of tungsten and sulfur?with?chemical formula WS2. It is black, insoluble in water and organic solvents, not react with acid and alkali except the mixture of concentrated nitric acid and hydrofluoric acid?as well as aqua regia. It is nontoxic?and?nonmagnetic. Since 1990s, the?tungsten disulfide?applied in industry is gradually wide,?it is mainly used in five aspects including?solid lubricant, catalyst, electron probe, battery electrode material?and superconducting material, it is considered as high potential multidingal material. 1.0…

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Tungsten Wire Application Property 187

There are three types of tungsten wire application property: high temperature, room temperature and wire diameter consistency. 1.0 High temperature application property. The working temperature of tungsten filament for incandescent lamp is usually between 2300-2800 Celsius degrees. Generally, the greater the power ratio of bulb is, the higher the working temperature of filament is. It shows that the working temperature of the filament is far higher than the recrystallization temperature. Then due to the self weight effect of the filament,…

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Doped Tungsten Wire 188

The doped tungsten wire is?the wire?that dopes certain amount of potassium and silicon into pure tungsten powder. It will not only increase the color temperature, luminous efficiency and life time of wire, but also has well anti sag propery, it can be used as special lamp filament with high working temperature such as halogen lamp. Provided that some alloy elements such as cobalt are added into the doped wire, the wire will have high strength and shock resistance. The wire…

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The Friction and Wear Property of Tungsten Disulfide Nano Powder 167

The friction and wear property?of tungsten disulfide nano powder is a new topic, as a new type of solid lubricating material, tungsten disulfide has excellent lubricating property, it?has a layered hexagonal structure, the W and S elements in the layer are combined by covalent bond, and the molecular bond?formed by S-S in the layer?is combined. Because of the low bond energy of the latter, it is easy to slip during the friction process, so it has lower friction coefficient. Tungsten…

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Synthesis Method of Nano Tungsten Oxide 183

Currently tungsten oxide has been widely used in electrochromic intelligent glass, optical device, supercapacitor, gas sensor, photocatalysis, photothermal therapy and other application fields. With the rapid development of nano science and technology, more and more synthesis methods of nano tungsten oxide are available, mainly has there kinds of methods including vapor deposition, liquid-phase synthesis and solid-phase synthesis. 1.0 Vapor deposition Vapor deposition is widely used in the synthesis of materials. Generally it is a kind of synthetic method of depositing…

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Application of Tungsten Oxide 183

Tungsten oxide is?the potential?oxide material in the energy?field?for?its rich?content?in the earth, highly adjustable composition, high chemical stability at low pH value and excellent conductivity.?Now?it has?wide?application?in seven fields including electrochromic and photochromic, lithium-ion battery anode materials and heat insulation materials, etc. 1.0?Used in?electrochromism and photochromism In the past few decades, electrochromic device based on WO3 has?been widely studied, there are many types of electrochromic devices, of which the most widely used and simplest type is sandwich structure?including?electrochromic layer, electrolyte for ion…

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Application of Nano Tungsten Trioxide in Gas Sensing Material 139

With the rapid development of industry, the overuse of oil, natural gas and other resources has caused serious pollution of air and environment. The manufacture of gas sensing material for detecting toxic and harmful gases has became a hot research spot. Nano tungsten trioxide used as gas sensing material can be divided into four structures。 （1）Nano tungsten trioxide gas sensing material with zero-dimensional structure The materials of zero-dimensional structure are mainly nanospheres, nanoparticles and quantum dots. Although the specific surface…

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Application of Nano Tungsten Trioxide in Photocatalytic Material 165

The following is to introduce how nano tungsten trioxide is photocatalyzed. Firstly, preparing for a nano tungsten trioxide, then text it photocatalytic properities of water cracking into oxygen and protons. Because the nano tungsten trioxide lack of quality of metals, ?it almost no catalysis. Secondly, adding a small amount of platinum and ruthenium dioxide into nano tungsten trioxide to improve its catalytic performance. And it turns out that the absorption band of nano tungsten trioxide becomes wider from narrow, the…

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