Tungsten

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Preparation of Large-size Tungsten-Based Heavy Alloy 231

Large-size tungsten-based heavy alloy has a series of advantages including?high density, low coefficient of thermal expansion, good oxidation resistance and corrosion resistance,?etc.?In fields of aerospace, electronic information and so on, large-size and high performance tungsten-based heavy alloy is in urgent need. Find the rule of?internal structure of large-size tungsten based high specific gravity alloy?during liquid phase sintering process?to obtain?high homogeneity, high performance and parts of large-size tungsten based high specific gravity alloy. After analyzing the composition, sintering process, material property,…

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Metal Injection Molding of High Density Tungsten Alloy 261

The cost of traditional high?density?tungsten?alloy is high, as 3C industry begins to use small-size high density W-alloy part?as counterweight material,?higher requirement is?put forward for the forming technology of high density W-alloy. Therefore metal powder injection molding (MIM)?technology appears, it?is a new near net forming technology for part, which combines plastic injection molding technology with powder metallurgy technology, it can?effectively promote the wide use of high density W-alloy materials in 3C and other high-tech industries. The metal injection molding of high…

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Fracture Failure of High Density Tungsten Alloy 222

High density tungsten alloy has excellent mechanical property, anti burning property and absorption ability to radiation. Therefore, it is used in explosive parts such as armor piercing bomb. Normally, the part should keep well after impacted by the front end explosion, but in the test, the component breaks without external force. In order to?make analysis of the failed component’s fracture failure, the fractured explosive component?and different batch of standard components meeting the requirements?are?compared and analyzed to confirm?the failure reason of…

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Ammonium Metatungstate for Petroleum Catalyst 190

Ammonium metatungstate is the main raw material of tungsten-based catalyst, which can greatly improve the catalytic performance of the prepared product. In recent years, with the development of petroleum refining and petrochemical industries, the amount of tungsten compounds has also increased. Ammonium metatungstate is an inorganic compound with a chemical formula of H28N6O41W12, a molecular weight of 2974.32, with white or light yellow color, the purity is up to 99.95%, and main content of WO3 is up to 83.0%. It…

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How to Prepare Ammonium Metatungstate from Waste Tungsten Oxide? 194

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 206

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 192

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 247

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 227

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 247

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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