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High-calcium Ammonium Paratungstate 374

High-calcium ammonium paratungstate means the ammonium paratungstate powder that has excessive Ca content. The phenomenon of excessive Ca content in APT products is likely to occur during the production of APT by ion exchange process. The high-calcium APT must be reprocessed as it will not only affect the quality of tungsten carbides, but also cause a waste of tungsten resources to some extent. The conventional process to treat ammonium paratungstate with severely Ca content has the disadvantages of long process…

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Spherical-crystal Ammonium Paratungstate 392

Spherical-crystal ammonium paratungstate can be used to prepare high-performance tungsten heavy alloys, which has the characteristics of high density, good ductility, large yield strength and high tensile strength. This is because the spherical-crystal tungsten powder obtained by calcination and hydrogen reduction of spherical single-crystal ammonium paratungstate has large loose apparent density and good fluidity. And it is easy to fill the die cavity. Also, it makes the density of compact uniform. The W-Ni-Fe heavy alloy prepared by spherical tungsten powders…

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Orthorhombic Ammonium Paratungstate 347

Orthorhombic ammonium paratungstate is the necessary intermediate raw material with the chemical formula of (NH4)10H2W12O42?10H2O during the process of tungsten metallurgy. The decomposition reaction of orthorhombic APT may be determined in a HT-1000 nicrocalorimeter by three step calorimetry. The chemical equation is as follows: (NH4)10H2W12O42?10H2O(s) = 12WO3(s) + 10NH3(g) + 12H2O(g) Thermal Decomposition Mechanism of Orthorhombic Ammonium Paratungstate 1. Dehydrate at 335K and 376K. 2. Decompose into amorphous ammonium tungsten bronze at around 475K. 3. Form into crystalline ammonium tungsten…

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Monoclinic Ammonium Paratungstate 339

Monoclinic ammonium paratungstate with different particle size can be obtained by different heating stages. The changes of particle size and surface area at each stage in rapid thermal decomposition of monoclinic APT can be concluded by differential thermal analyzer (DTA) and laser particle size analyzer, which can guide the preparation of tungsten oxide with desired particle size. Rapid Thermal Decomposition of Monoclinic Ammonium Paratungstate 1. Monoclinic APT was heated to 600°C at a rate of 9°C/min in argon (Ar) for…

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Single Crystal Ammonium Paratungstate 320

Single crystal ammonium paratungstate is a key material for producing high quality tungsten wire, which is always applying in cars. That is because the single crystal APT has the characteristics of good tensile property and fracture resistance. And the tungsten wire using the single crystal APT as raw material has yield of 90%, which is higher than that of adopting polycrystalline paratungstate ammonium as raw material with yield of 70%. Single crystal APT also has many other excellent physical properties…

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Tungsten Alloy Radiation Brick 323

Tungsten alloy radiation brick has many excellent characteristics and excellent shielding effect against radiation. It is widely used in weapons and equipment, machinery manufacturing, aerospace equipment, medical shielding and sports weights. Characteristic Tungsten alloy radiation brick has excellent radiation absorption capability, electrical conductivity, thermal conductivity, corrosion resistance, high density, good mechanical strength, low coefficient of expansion, and high modulus of elasticity. Applications Tungsten alloy radiation brick can be used in nuclear medicine, neutron radiation shielding, instrument shielding protection, cobalt shielding,…

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Radium Isotope Tungsten Radiation Shielding 324

Radium isotope tungsten radiation shielding has high density, high radiation shielding, and non-toxic environmental protection. It is widely used in medical and industrial applications. Characteristic Radium isotope tungsten radiation shielding has a good absorption capability for radium. Radium is a highly radioactive element that emits alpha and gamma rays upon decay, and emits a large amount of heat, which produces fission and thorium, and thorium is also radioactive. Radium rays can destroy animals, kill cells and bacteria, and use radium…

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Tungsten Decay Radiation Shielding 346

Tungsten decay radiation shielding can reduce and avoid the damage to the human body caused by the radiation released during the entire process of decay. It has excellent decay product radiation absorption ability and green environmental protection characteristics. It is widely used in radiation shielding. Characteristic Tungsten decay radiation shielding is made of a tungsten alloy and usually has high density and good processability. Tungsten alloy has the density higher than 60% of lead density and is very suitable materials…

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Tungsten Neutron Capture Reaction Shielding 303

Tungsten neutron capture reaction shielding is made of tungsten alloy and has excellent properties such as high density, high radiation shielding, and non-toxic environmental protection. It shields neutrons up to 93%, and has a significant shielding effect, which is not harmful to the environment and the human body. Neutron capture reaction emits a large amount of gamma rays or X-rays, which is harmful. Protect the safety of relevant workers and the environment from harm. Tungsten neutron capture reaction shielding can…

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Neutron Tungsten Radiation Shielding 283

Neutron tungsten radiation shielding has good shielding effect and is a good neutron radiation shield. It is widely used in tumor radiation therapy, nuclear industry, aerospace industry and high-risk explosives industry. Characteristic Neutron tungsten radiation shielding is a shield made of tungsten alloy. Tungsten alloy is a high-density metal material and is also the best material for shielding neutrons. Neutron tungsten radiation shielding is twice as shielded as lead shields, 25% to 50% lighter than lead, and is non-toxic and…

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