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Molybdenum Disulfide Used in the Lubrication Field 289

Molybdenum disulfide (MoS2) is known as the “king of lubrication” and has unique advantages in the lubrication field. It has a layered structure and still keeps good lubrication property under severe conditions such as high temperature, high pressure, high rotation, and ultra-low temperature. MoS2 is a kind of natural excellent solid lubricant because of its low friction coefficient with only 0.05. It also has excellent properties such as natural weak alkalinity and excellent anti-oxidation ability, which is used in the aviation…

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Molybdenum
Preparation Method of Nano Molybdenum Disulfide 298

As the excellent property of nano molybdenum disulfide, its preparation method has attracted great attention at home and abroad. Currently the chemical synthesis methods of nano molybdenum disulfide mainly include: chemical reduction, chemical decomposition, chemical oxidation, electrochemical, surfactant assisted, hydrothermal and solvothermal synthesis method, natural mineral purification and physical method, etc. 1.0 Chemical reduction method The pentavalent and hexavalent salt or compound of molybdenum have strong oxidizing property and can be reduced to tetravalent molybdenum under the action of reducing agent. The…

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Application of Molybdenum in Medicine Field – Molybdenum Target 207

Molybdenum (Mo) and molybdenum alloy materials have wide applications in the manufacturing industry, aerospace industry, steel smelting, petrochemical industry, medical devices, national defense construction and other industrial fields. In the field of medicine, the most widely known and closely relevant to our lives is molybdenum target. Mammography is to take pictures of breast tissue to achieve the purpose of diagnosis by using soft X-ray, the structure mainly includes X-ray tube, high-voltage generator, rack/mechanism, compression plate, image processing device(or cassette), puncture biopsy system, image post-processing…

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The use of High Purity Molybdenum Sputtering Target in Liquid Crystal Display 276

With the development of science and technology, molybdenum shows its advantages in many fields, which has changed human life in various aspects, one of the familiar applications is to manufacture liquid crystal display. Large-size high purity molybdenum sputtering target is the key raw material in the producing of LCD panel, and Mo is one of the preferred materials for sputtering target of LCD panel. This kind of target is used in the daily color TV, intelligent phone, tablet computer and some…

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Common Preparation Methods of Molybdenum Powder 289

Molybdenum powder prepared by traditional technology is often used to be raw material of molybdenum sintered products, the common preparation methods include reduction method, fluidized bed reduction method, hydroxyl thermal decomposition method etc. 1.0 Reduction method 1.1 Ammonium molybdate roasting→two-stage reduction. This method is the main method used in industrial production, the purity of Mo powder produced is high, the particle size is usually in micron level. 1.2 Ammonium molybdate two-stage reduction method. Without calcination, ammonium molybdate is directly reduced once…

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Preparation of Large-size Tungsten-Based Heavy Alloy 195

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 178

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 172

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 155

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? 157

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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