Tungsten Oxide

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Single-crystal Ammonium Paratungstate 3,551

Single-crystal ammonium paratungstate has properties of good fluidity, high bulk density, small and uniform grain gaps in the blank, few mechanical defects and high compaction density. It also has excellent physical properties such as good compression resistance, tensile resistance, impact resistance, shear resistance and fracture strength. Therefore, single-crystal ammonium paratungstate is an ideal raw material for the production of high-performance tungsten materials such as tungsten powder, tungsten wire, tungsten carbide microdrill, tungsten carbide tool, and tungsten alloy ammunition. More details,…

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Spherical Ultrafine Ammonium Paratungstate 1,307

Spherical ultrafine ammonium paratungstate, or spherical single crystal ultrafine ammonium paratungstate (APT), is the key powder material for fabricating high-density alloys with high performance. More specifically, the spherical ultrafine APT is calcined to obtain tungsten oxide, and spherical tungsten powder is prepared after hydrogen reduction of tungsten oxide. The prepared spherical W powder has the advantages of high bulk density, good fluidity and easy filling of film cavity. Also, it makes the compact have uniform density. So it can be…

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Coarse Crystalized Ammonium Paratungstate 1,376

Coarse crystalized ammonium paratungstate (APT) is a flaky or needle-like white crystal that is slightly soluble in water and insoluble in alcohol. As a raw material for the powder metallurgy industry, coarse crystalized APT has the characteristics of simple production process, high purity, high bulk density, good fluidity, and easy storage and transportation. More details, please visit: http://ammonium-paratungstate.com/index.html The particle size of ammonium paratungstate crystals has a great influence on the particle size of subsequent tungsten powders. It has been…

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Ammonium Paratungstate Tetrahydrate 1,491

Ammonium paratungstate tetrahydrate, or APT·4H2O, is an important intermediate product in the production of tungsten powder. It has been reported that it is a key process to crystallize APT·4H2O from an aqueous solution of ammonium tungstate in the current preparation method of tungsten powder. More details, please visit: http://ammonium-paratungstate.com/index.html According to the literatures, ammonium paratungstate tetrahydrate is an intermediate for the production of metal tungsten, tungsten-containing catalysts or hard materials based on tungsten (such as tungsten carbide) or sputtering targets.…

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Ultrafine Ammonium Paratungstate 212

Ultrafine ammonium paratungstate is an important raw material for the production of nano tungsten powder. Since the 1990s, nano tungsten powder has been generally concerned by researchers all over the world, and ultrafine APT, as an important raw material for preparation of W powder, is also receiving much attention. More details, please visit: http://ammonium-paratungstate.com/index.html However, the particle size of common ammonium paratungstate is 25-45 μm, which is difficult to meet the requirements of producing nano tungsten powder, so the preparation…

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98% Sodium Tungstate Dihydrate 818

98% sodium tungstate dihydrate may be studied by TG-DTG technology to know its dehydration process. And the non-isothermal kinetic data of the dehydration process is analyzed using the thermal analysis kinetic data processing method proposed by Malek et al. Processing Methods of Kinetic Data Malek et al. proposed a relatively complete set of kinetic data processing methods. The steps are as follows: 1. Activation energy E was calculated using Ozawa method and Kissiger method among the multiple scanning rate method.…

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Industrial Grade Sodium Tungstate Dihydrate 881

Industrial grade sodium tungstate dihydrate is also known as technical grade sodium tungstate dihydrate with molecular formula of Na2WO4•2H2O. The thermal decomposition of Na2WO4•2H2O and its kinetics was studied in a static air by TG-DTG. The thermal decomposition process of the Na2WO4•2H2O occurred in one stage. By the kinetic method of processing thermal analysis data put forward by Malek et al, it is defined that the kinetics model for the dehydration process in SB (m, n). The activation energy E…

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Chemically Pure Sodium Tungstate 814

Chemically pure sodium tungstate is a good inhibitor for carbon steel in simulated seawater, and the inhibition efficiency increased with the increase of inhibitor concentration, and the adsorption of sodium tungstate onto the surface of carbon steel followed the amended Langmuir adsorption isotherm equation. Composite of sodium tungstate and SLS has better corrosion performance than that of sodium tungstate alone, which shows excellent synergistic effect. Compound inhibitor has higher efficiency, with lower Tafel slope on the cathode and anode and…

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High Purity Sodium Tungstate Dihydrate 895

High purity sodium tungstate dihydrate is a colorless or white crystalline powder that can be decomposed by strong acids into tungstic acid (water-insoluble). It is easily weathered in dry air. And it is stable in air, but heated to lose crystal water into anhydrous salt at 100°C. Besides, it is soluble in water and insoluble in ethanol. High purity sodium tungstate dihydrate can be applied for the preparation of tungstic acid, and tungstate, etc. And it can also be used…

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99.5% Tungstic Acid 464

99.5% tungstic acid may be prepared by “dissociation-slurrying-acid decomposition” process. This process uses less raw materials and auxiliary materials. And it is easy to operate. So, it is cost-saving and time-saving. Some people have conducted experiments on acid decomposition of tungstic acid, acid decomposition of ammonium paratungstate (APT), and acid decomposition of CaWO4 to make tungstic acid. The first two methods have been found to be slow to decompose. As the decomposition reaction proceeds, the acidity decreases continuously, so that…

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