Tungsten

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The Gas Sensitivity of Nano Plate Shaped Tungsten Trioxide 193

This article will discuss the gas sensitivity of nano plate shaped tungsten trioxide gas sensor at different concentration of ethanol gas, acetone gas, ammonia gas and formaldehyde gas in terms of temperature-sensitivity. As semiconductor material with good sensitivity to various toxic gases, nanostructured tungsten trioxide can effectively improve the sensitivity and response speed of gas sensors. The gas sensor using nanostructured tungsten trioxide as gas sensitive material can be done to make lower thickness detection of target gas, which can…

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Nano Tungsten Oxide for Semiconductor Memory 159

The reason why semiconductor memory chooses nano tungsten oxide material to produce storage media is that it is a very important semiconductor material with good electrochemical performance, and its resistance value can undergo reversible transformation under the action of an electric field. Next, let’s take a look at the manufacturing method of a storage device based on a tungsten oxide storage element. Manufacturing method (1) The storage device includes a plug that extends upward from the top surface of the…

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Preparation Method of White Tungsten Oxide 186

Tungsten oxide is a very classic low-dimensional transition metal oxide material, which is attracted by its special physical and chemical properties (such as electrochromism, photochromism, catalytic activity, superconductivity and large load capacity, etc.) A large number of materials, semiconductor devices, and physics and chemistry researchers are paying attention. However, there is no report on white tungsten oxide and its preparation method. The chemical formula of white tungsten oxide is the same as that of purple tungsten oxide, which is W18O49.…

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Tungsten Trioxide for Mulch 157

In addition to the production of tungsten trioxide (WO3) ultrafine particles, they can be used to produce tungsten powder, tungsten carbide powder, yellow ceramics, electrode materials for energy storage batteries, anti-corrosion paints and coatings, and can also be used to make multidingal mulch films. Compared with ordinary agricultural film, the agricultural film containing tungsten oxide additives has higher comprehensive performance, which is mainly manifested in better heat insulation effect and better light transmission performance. In areas with strong sunlight, when…

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New Production Process of Tungstic Acid 136

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 246

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 234

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 207

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 202

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 180

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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