Tungsten

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How to Prepare Ammonium Metatungstate from Waste Tungsten Oxide? 185

In the existing technology, using waste tungsten oxide (WO3) as a raw material, only low value-added ammonium paratungstate (APT) can be obtained, and high value-added ammonium metatungstate (AMT) products cannot be obtained. Moreover, WO3 waste ammonia after leaching, APT is needed to crystallize, so a crystallization reactor is necessary, and the investment in crystallization reactor equipment is relatively large, resulting in higher production costs and poor economic benefits, and the recovery rate of WO3 waste is low. Therefore, it is…

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Cesium Doped Tungsten Oxide for Heat Insulation Film 190

As a new type of transition metal compound material, cesium doped tungsten oxide nano particles have excellent near-infrared absorption performance and visible light transmission performance, and are often used to prepare high-quality transparent heat insulation film. Its application range is wide. The heat insulation film is to achieve the effect of heat insulation and energy saving by means of heat insulation materials. Traditional thermal insulation materials include glass fiber, asbestos, rock wool, silicate, etc., while new thermal insulation materials include…

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Cesium Doped Tungsten Oxide Powder for Thermal Insulation Glass 176

Compared with single component tungsten oxide powder, the optical performance of cesium doped tungsten oxide powder is more superior, that is, the absorption ability of infrared rays is stronger, and the transmittance of visible light is higher. It has wide application range in block of near infrared light and thermal insulation glass. How to prepare cesium doped tungsten oxide nano powder with reasonable cost and high product stability? (1) Dissolve the raw material tungsten salt and cesium salt in a…

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How to Make Tungsten Carbide Preparation 219

Tungsten carbide (chemical formula WC) is the compound made up of tungsten and carbon, following will show the preparation procedure. The molecular formula is WC and the molecular weight is 195.85, which is black hexagonal crystal with metallic luster and has similar hardness to diamond. It is a good conductor of electricity and heat. WC is insoluble in water, hydrochloric acid and sulfuric acid, but easily soluble in the mixed acid of nitric acid and hydrofluoric acid. Pure WC is…

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Influence Factors of Nanostructured Tungsten Trioxide Preparation 203

During the process of nanostructured WO3 synthesis it is found that citric acid content, system pH value before hydrothermal synthesis, hydrothermal reaction temperature and hydrothermal reaction time will have great influence on the product, therefore the following will focus on several influence factors affecting the phase and morphology of nanostructured WO3. 1.0 Effect of citric acid content on nanostructured WO3 The morphology of WO3 nanostructures prepared with different citric acid content is significantly different, with the increase of citric acid…

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Liquid Phase Method for Preparing Nano Tungsten Trioxide 226

Liquid phase method is the most widely used method among many methods for synthesizing nano tungsten trioxide. Its advantage is that the nano structured WO3 particles are fine and evenly distributed, the content of the chemical components can be precisely controlled, the morphology of the nanostructured WO3 can be controlled by adjusting the morphology control agent, the synthetic process is simple, economical and good to mass production. There are four main methods including hydrothermal synthesis, sol-gel method, precipitation method and…

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The Gas Sensitivity of Nano Plate Shaped Tungsten Trioxide 181

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 151

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 165

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 149

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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