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How to Make Tungsten Carbide Preparation 265

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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Preparation of Molybdenum Carbide 498

Molybdenum carbide (chemical formula MoC) has the characteristics?of high melting point, hardness, good thermal, fine mechanical stability and excellent corrosion resistance. Molybdenum is a kind of silvery white refractory metal with melting point of 2615℃ and density of 10.2g/cm3, its expansion coefficient is almost the same as that of the special glass used in electron tubes. Molybdenum is stable at room?temperature and oxidizes rapidly above 600℃. It reacts with carbon, hydrocarbon or carbon monoxide to generate MoC above 800℃. Preparation…

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Preparation Methods of Molybdenum Carbide 311

With the development of chemical engineering technology, there are a series of synthesis methods used to produce nanometer scale pure molybdenum carbide (chemical formula MoC)?, the followings are five common preparation methods: 1.0 Temperature programmed reduction method The temperature programmed method raised in the 1980s is still the most widely used method to obtain MoC in the laboratory, during the reaction experiment, molybdenum oxide is used as molybdenum source, hydrocarbon gas and hydrogen are used as basic materials for carbon…

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Influence Factors of Nanostructured Tungsten Trioxide Preparation 243

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 265

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 206

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 163

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 191

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 163

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 144

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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