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2023年02月

Preparation Method of Monoclinic Phase Cobalt Tungstate Nanorod Powder

Cobalt tungstate (CoWO4) is one of the representatives in the series of divalent transition metal tungstates. The crystal itself is a typical wolframite ore P2/c monoclinic space group structure. Due to its special structure, CoWO4 crystal exhibits a high dielectric constant, making it an important role in catalytic decomposition of organic pollutants, photoelectric displays, microwave dielectric ceramics, photovoltaic electrochemical cells, and magnetic memory material.

At present, the preparation method of cobalt tungstate nano material is mainly by solid phase method. Co3O4 and tungsten trioxide (WO3) are used as raw materials. The materials are uniformly mixed by a ball mill, and calcined in an air atmosphere at 900 ° C for 12 hours, and then ball milling is performed to reach the particle size smaller than 3 μm.  Then, the CoWO4 ceramic powder is synthesized by sintering in an air atmosphere at 1200 ° C for 2 hours. This method is simple in operation but has a large particle size and segregation of components, which reduces the luminous efficiency of the material.

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In order to overcome the high synthesis temperature existing in the conventional scheme, the problem of poor product composition and particle size uniformity.  Some scholars have used the precipitation method to prepare monoclinic phase cobalt tungstate nanorod powder, which is implemented according to the following steps:

Step 1, the macroscopic size CoWO4 powder is added to the aqueous solution of triethanolamine, heated in a water bath to obtain a mixture A;

Step 2, slowly adding the aqueous solution of polyvinyl alcohol and the aqueous solution of sucrose to the mixture A heated in the water bath to obtain a uniform precursor solution, keeping it for 3-5 minutes, then heating to 190-210 ° C under constant stirring, and keeping the precursor to the precursor. Lathe Machine Cutting Tools  The solution is slowly evaporated to dryness. When the solution is evaporated to dryness, a fluffy black organic block material is produced at the bottom, which is a precursor block;

Step 3, the precursor block obtained in the step 2 is subjected to pulverization, grinding, heat treatment, and then naturally cooled to room temperature to obtain a cobalt tungstate nanorod powder.

The new process utilizes a simple experimental setup and reaction steps to obtain a precursor; finally, the precursor is heat treated to obtain a monoclinic phase cobalt tungstate nanorod powder. The method has low raw material cost, simple equipment and high reaction yield. The preparation method of the invention overcomes the disadvantages of high synthesis temperature, poor product composition and uniformity of particle size in the prior preparation method.

 

Tungsten Carbide Scraper Applied for Mask Machine

Tungsten carbide scraper is an important part of mask machine to fabricate surgical masks, N95 masks and other protective masks. Such a high-precision scraper can effectively clean the scraps generated by the mask machine during cutting process without polluting the environment.

Original material?Corodrill 818 Txn160408-L/ Txn250408-L ?using for drilling machine tungsten carbide cutting tools drilling inserts

More details, please visit:
http://www.tungsten-carbide.com.cn/tungsten-carbide-blade-bar.html

Original material?Corodrill 818 Txn160408-L/ Txn250408-L ?using for drilling machine tungsten carbide cutting tools drilling inserts

It has been reported that tungsten carbide has good process properties, such as forging performance, heat treatment performance, high temperature plastic deformation performance, and grinding processing performance, etc. So, it is suitable for the manufacture of scrapers. Besides, tungsten carbide is economical to some extent. Although they are very expensive, high-quality tungsten carbide scrapers are sharp with the characteristics is of high hardness, high toughness, good wire resistance, good corrosion resistance and long service life to reduce the frequency of replacing and Steel Inserts maintaining, and improve production efficiency. And the mask cuts are beautiful with no burrs, so that they are suitable for wearing.

W18O49 Applied for Infrared

W18O49 is an important material for fabricating infrared-shielding film, to sufficiently transmit visible rays and shield invisible near-infrared rays. Some experts prepared W18O49 powder by heating a mixture containing a predetermined amount of a tungsten compound at 550 °C in a reductive atmosphere for 1 h, then cooled to room temperature once in an argon atmosphere.

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More details, please visit:
http://tungsten-oxide.com/index.html

Good Quality Tungsten Carbide Cutting Tools Special-Purpose Turning Inserts RCMX2507MO

The experts mixed W18O49 powder, the solvent, and the dispersant, then subjected to dispersion treatment to obtain a dispersion solution. The dispersion solution and a UV-curable hardcoat resin are mixed to obtain a solution of fine particle dispersion of infrared-shielding material. The solution of the fine particle dispersion of infrared-shielding material is applied on a PET resin film to form a film, then cured to obtain an infrared-shielding film. The prepared infrared-shielding thin film can sufficiently transmit visible rays without half-mirror shaped appearance, and can efficiently shut invisible near-infrared rays with wavelength range of 780 nm or more. This preparation method  requires no large-scale apparatus when forming a film on a substrate, while eliminating a heat treatment at high temperature after film formation, and having a spectral characteristic such as transparency with no change of color tone.

Continuous Preparation of Tungsten Trioxide Nanoparticles by Gas Phase Method

Tungsten trioxide (WO3) is an important n-type semiconductor oxide, which has a variety of crystal structures. Due to its unique physical and chemical properties, it has been widely studied, and has been applied in electrochromic, photochromic, sensing and catalytic fields. In order to further utilize the excellent properties of WO3 and broaden its application field, the best technical way is to reduce its grain size, that is, nano tungsten oxide.

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Gas phase method is one of the most effective methods to prepare nanostructures. With APT·xH2O as raw material, high temperature sintering and gas deposition technology, argon as carrier gas, and powder collection in low temperature area, the continuous preparation of tungsten trioxide nanoparticles with various morphology can be successfully prepared. The method includes the following steps:

Step 1, take the quartz glass tube including the air inlet and the air outlet, place the carbon cloth around the inner wall of the quartz glass tube near the air outlet end, and place the quartz glass tube with the carbon cloth horizontally in the tubular furnace.

Step 2, heat the quartz glass tube in the tubular furnace to the specified temperature.

Step 3, push the ceramic crucible containing ammonium paratungstate into the glass tube, and blow argon into the constant temperature zone heated to the specified temperature.

Step 4, close the cutting tool tubular furnace and stop blowing argon after holding for 40min-60min.

Step 5, take out the carbon cloth, collect the reaction products deposited on it, get the multi morphology nano tungsten trioxide particles, and take out the ceramic crucible.

Step 6, repeat steps 1-5 for several times: put carbon cloth around the inner wall of glass tube again, move the crucible containing ammonium paratungstate to constant temperature area, turn on argon again, start the next round of reaction, and realize continuous production.

By combining high temperature sintering technology and gas deposition technology, using argon as carrier gas and using carbon cloth to collect powder in low temperature area, we can continuously produce various forms of nano-sized tungsten trioxide particles, which solves the problem of low output of traditional methods. The process is easy to operate, low cost and has great application prospect.

Electrochromism: Yellow Tungsten Oxide Film

When it comes to the phenomenon of electrochromism, many people think of yellow tungsten oxide film (WO3 film) - an earliest and most studied inorganic electrochromic film material. Well, do you know what the electrochromic mechanism of crystalline WO3 film is? And what is the electrochromic mechanism of amorphous WO3 film?

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More details, please visit:
http://tungsten-oxide.com/index.html

Lathe for CNC machine Cnmm 250724 Cnmm 250924 cemented carbide cutting tools turning inserts

Some experts have studied the coloring process of amorphous Drilling Inserts and crystalline yellow tungsten oxide film films under different voltages through ellipsometry, and explained the difference between the two electrochromic mechanisms. During the coloring of crystalline and amorphous WO3 films, the refractive index decreases and the extinction coefficient increases. The change rate of the refractive index and extinction coefficient of the crystalline WO3 film is significantly higher than that of the amorphous WO3 film. The absorption coefficient of amorphous WO3 increases almost linearly in the entire visible light band, while the absorption of crystalline WO3 is more significant in the long wave band. It means that the discoloration mechanism of amorphous WO3 is small-pole transition absorption, while crystalline WO3 is similar to the Drude free electron absorption of heavily doped semiconductor.

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