Ammonium paratungstate(APT) is a white crystalline salt of ammonium and tungsten, with the chemical formula (NH4)10(H2W12O42)·4H2O.

Microwave decomposition of solid crystalline ammonium paratungstate (APT) and ammonium metatungstate (AMT) was investigated. It was observed that APT and AMT interact with 2.45-GHz microwave radiation. Samples of ammonium paratungstate (20-50 g) were successfully converted into WO3-x (0 ≤ x ≤ 0.2). A wide variety of morphological parameters were found. The interaction of AMT with the 2.45-GHz microwave radiation resulted in the partial loss of crystalline water and the partial dissolution of the sample in the released water.

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Hydrogen produced in the cracking process of heated Ammonium paratungstate is used for the self-reduction of the cracked products. The impacts on blue tungsten oxide's properties by the major reduction parameters, including temperature and rotary kiln speed without ammonia or hydrogen. The application of this technology to environmental protection, energy conservation and production safety are focused.

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The strength of tungsten powder compacts mainly results from particles of irregular surface for particle shape is one of the most important factors affecting strength of tungsten powder compacts. Ammonium paratungstate has great influence on the tungsten powder particle shape. The compact strength varies greatly under the same process and raw materials with different properties while producing high compact performance tungsten powder using ammonium paratungstate one step reduction. The features of ammonium paratungstate for producing high compact performance tungsten powder are summarized by the experiments.

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Sulfur determination method in tungsten trioxide by high-frequency infrared carbon-sulfur analyzer. The effect of APT's calcination temperature on the sulfur content determination under the optimal instrument working conditions is studied. Experiments show the optimal calcination temperature of APT samples is 425℃. At the optimal temperature, water and NH3 in APT sample can be removed efficiently. In addition, the sulfur content in the sample can keep intact without decomposition and volatilization. The experimental results can truly reflect the determination of sulfur in APT sample. The sulfur determination scope ranges from 0.0005% to 0.3000%, and the recovery of standard addition is 98.6%.

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The spectrophotometric determination of impurities in the ammonium paratungstate, mainly determined by the reaction temperature, reaction time, NaOH concentration and stirring speed on the active ingredients wolframite tungsten leaching. Also investigated the properties of the resin in the ion exchange process, the exchange of the solution before concentration and flow rate, desorbent concentration, flow rate and temperature and other factors on the impurity removal rate during crystallization temperature paratungstate crystals.

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Bonding refers tungsten carbide cutting tools and workpiece material when exposed to the interatomic distance generated combined phenomenon. TC4 titanium alloy in high-speed cutting, the cutting temperature is high, the contact pressure, and the presence of microscopic surface roughness knife, resulting in reduced tungsten carbide hardness and adhesion between the workpiece and the tungsten carbide cutting tools and the workpiece material elemental affinity. When the bond strength high enough parts, parts outside of the local bond being cut. Shear occurs when the inner tool, part of the tools will be taken away chips, small-scale occurrence called adhesive wear, a large scale called chipping.

Small elastic modulus tungsten carbide cutting tools materials, the surface prone to rebound, so the process of cutting a large radial force, the actual contact area between the tools and the workpiece increases, the chip after the tools moves along the flank, the destruction of the hard after the alloy tools flank surface oxide layer, leading to flank wear after bonding tool. With the cutting progresses, eventually leading off the adhesive flank wear. At present, the international community generally after flank wear as a measure of the main criteria for tungsten carbide cutting tools life, severe flank wear will reduce the machined surface quality and dimensional accuracy. So after controlling for flank wear is an important way to improve the durability of tungsten carbide cutting tools.


 

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Wear is accompanied by a phenomenon generated by the friction, the two surfaces in contact with each other, in the process of mutual friction, decreases the volume of the phenomenon itself. Tungsten carbide cutting tools wear patterns and wear mechanisms associated with many factors, such as friction of chemical, physical and mechanical properties. The main wear mechanism of cemented tungsten carbide cutting tools wear are: abrasive wear, the phase transition wear, adhesive wear, diffusion wear, oxidation and wear.

Tungsten carbide cutting tools and the workpiece in the process of friction and wear phenomena are not independent of each other, but a variety of wear mechanisms result of the role. tools wear into normal wear and abnormal wear. Abnormal wear of the tools is mainly due to the toughness or hardness is too low, the structure or geometry of the tools is unreasonable; the cutting edge caused by excessive force chipping; Cutting selected unreasonable, resulting in cutting force is too big or too warm cutting high; there may be other reasons improper operation by the cutting edge chipping lead to sudden shocks. Normal wear of tungsten carbide cutting tools means the amount of wear of the tools with cutting time increases with evenly. tools normal wear due to a mechanical wear, abrasive wear, adhesive wear, abrasion diffusion, phase transition wear, oxidation wear, thermal wear, a thermoplastic deformation.


 

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Tungsten is hard, so it is sensitive to notch, which is difficult for cutting and requiring the use of carbide cutting tools. To prevent cutting cracks, it is often heated the workpiece to plastic - brittle transition temperature than cutting, and to strictly control the cutting operation program.

Tungsten grinding  requires a specific type of light grinding wheel, and needs to be cooled, otherwise it will crack. Thickness of 0.2 mm or more in front of tungsten sheet punching and shearing to be pre-heated over a certain thickness of the plate, not cut, often need to use the wheel cutting.




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Tungsten is a ideal material for shielding against χ rays and gamma radiation .The very high density of tungsten shielding(more than 60% denser than lead) allows a reduction in the physical size of shielding components, without compromising their rigidity or the effectiveness of the shielding characteristics.

Whether you need to protect sensitive electronic equipment or delicate human tissue, the energy-absorbing properties of T&D’s tungsten alloys make them exceptional choices for radiation shielding applications, in both medical and industrial settings.

Compared to traditional radiation shielding materials, tungsten alloys provide excellent value. A high-density alloy can provide the same energy absorption as lead using 1/3 less material! Unlike lead, you’ll also reduce administration costs by eliminating the need to obtain special licensing—it’s not required.

Clients all across the globe are taking advantage of tungsten alloy’s reliable radiation shielding properties. If you need to protect yourself, your patients or your equipment from the harmful effects of excess radiation, come to us!

Our products are available as finished machined parts or as short rod, round bar, and rectangular blocks.

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Tungsten heavy alloy PET pig dyringe dhield/radiation shielding is a suitable raw material for radiation protection, as its combination of radiographic density (more than 60% denser than lead), machinability, good corrosion resistance, high radiation absorption (superior to lead), simplified life cycle, non-toxic and high strength. It can provide the same degree of protection as lead whilst significantly reducing the overall volume and thickness of shields and containers. Besides, compared with lead or depleted uranium in the past, wolfram alloy is more acceptable in this case, for they are non-toxic.

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