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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There are 4 general categories of tungsten darts. Nowadays, the tungsten dart is popular among top players. As it was known, was long-lasting, did not need soaking and was more resistant to damage by darts than poplar darts.

1,50% to 70% Tungsten- $15 to $50 (commonly sold at discount stores)

2,80% Tungsten - $25-$75 (popular with new league players)

3, 90% Tungsten- $50-$200 (high density, will hold up well, feel better to throw.)

4,95% to 98% Tungsten - $100 - $200 (high density, thinner, resist wear, feel better to throw. However,slightly more likely to break.)

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The billets that tungsten darts are made from consist of a variety of metals, including tungsten. To manufacture the blanks for machining tungsten darts, tungsten powder and other metals are blended and bonded by heat and pressure, resulting in a "sintered" material that we refer to as Nickel-Tungsten (or Copper-Tungsten, etc.) Common materials include tungsten, nickel, copper, and iron.

Discount outlets often sell low-density tungsten darts without specifying the percentage of tungsten content, but just say "Tungsten Darts". Such darts are often cheap Chinese imports of poor quality. Look for the percentage of tungsten on the packaging, a higher number means that the dart is more dense, and generally better quality.

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Tungsten dart prices have gone up in recent years, raising the tungsten dartprice of quality darts sets. However, in order to offer "bargain" prices, many sporting good stores & discount outlets now sell cheap "Tungsten Darts" that actually contain only a tiny trace of tungsten in them.

Many of these cheap sets are about the same density as brass (or less), but cost quite a bit more. Always look for the percentage of tungsten on the package, and buy from a reliable vendor.

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tungsten carbide cutting tool edge smoothness and integrity is an important factor to evaluate the quality of tungsten carbide cutting tool in the production process, therefore needs to be reasonable control.

1. Tungsten Carbide Cutting Tool Edge Smoothness
More smooth cutting edge passivation of the better, that relatively small number of chipping. Originally present on the cutting edge chipping, smaller width needed to completely remove; chipping width larger, the need to have to become smooth chipping nearby. When the machine speed is too high or nylon abrasive particles are too large, it will lead to increased kinetic energy of particles, collisions between particles and the cutting edge of severe, can cause chipping, there is likely to make the original width larger chipping . In order to ensure the smoothness of the cutting edge, the use of abrasive brushes mesh number the better, while the machine speed is not too high.

2. Tungsten Carbide Cutting Tool Edge Smoothness Integrity
Integrity blade means and whether there is chipping off the block and other defects on the cutting edge. Vibration process, if the collision with the cutting edge of the abrasive is too severe, can lead to edge chipping or cutting off the block, which will affect the surface quality of the blade. You can adopt the following measures: reducing motor speed and abrasive particle size increases.


 

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Uniformity refers to consistency throughout the tungsten carbide cutting tool edge on the cutting edge shape. Tungsten carbide cutting tool clamping way affect the uniformity of the edge of the arc. Freestyle abrasive blade in the container together with the random motion, but also a roll, so the friction and wear throughout the blade edge is consistent, then even better in all directions. For fixed type, the speed of the entire abrasive is not the same, the speed of the bottom is large, the kinetic energy of the bottom of the larger abrasive particles, the abrasive particles collide with the bottom of the cutting edge even more, while the upper part is small, the , under the same conditions, the friction and wear at the bottom of the larger, the larger edge radius cutting edge; the same time, the blade is fixed, the number of collisions can affect the local abrasive particles and the cutting edge, leading to partial edge radius is too small.

In general, the material at the tip of tungsten carbide cutting cutting tool to remove than larger, resulting in a blunt tip at a larger radius. The main reason is the lower part of the nose strength, heat resistance and poor wear faster. To ensure uniformity, may be added a small amount of coolant used in the passivation process, and the larger the abrasive brush abrasive grit brush.




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Due to high density tungsten alloy, good tensile strength and ease of processing and pollution and other characteristics, and therefore became the most popular means of transport as a counterweight material.

★ Counterweight for yachts, boats, submarines, or other types of boats

★ Car and other models crankshaft counterweight

The right balance to make the car's performance to be the greatest play. Our car chassis weight member is twice the density of steel, but only half the weight of lead.
Tungsten alloy counterweight racing will:
• Keep your lower center of gravity;
• Adjust the balance of front and rear;
• After machining can be just right for racing chassis;
• threaded holes at both ends to make the operation more flexible;
• Standard counterweight block size is 2 5/8 "x 3 5/8" x 6 ", weighs 35 pounds.
• also produce other sizes of weights.




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The influences of condensation and evaporation area ratio, crystallization temperature and stirring rate were investigated on the concentration of the ammonia water resulting from ammonia tail gas condensation in the process of APT crystallization. The results shows that both lower crystallization temperature and faster stirring rate can increase ammonia concentration of the recovered solution from crystallization ammonia tail gas .When the condensation and vaporization area ratio is 3.9 and the crystallization tempetature is 110, the total ammonia concentration of the recovered solution is 9.9 mol/L.

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

APT calcined in air change course: T ≥ 240 ℃, as ammonium metatungstate (AMT)300 ~ 350 ℃, ammonium tungsten bronze ATB.400 ℃, the hexagonal WO3.
500 ℃, triclinic crystalline tungsten trioxide.

APT purity, crystalline of hereditary. Calcination temperature, speed has a significant impact on the physical and chemical properties of the product. The higher the calcining temperature, the more coarse particle size obtained WO3.Rapid heated, larger specific surface area. Slowly heated, perfect crystalline, smaller specific surface area.

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According to Arrhenius theory, using the method of nucleation period integral mean rate, the apparent activation energy of ammonium patatungstate (APT) crystal growth is calculated as 94.657KJ/mol. At the same time, the relational expression between APT crystal growth rate constant and temperature is concluded as kn=8.46*10¹⁴ exp (-94657/RT). The results show that the increasing rate of APT nucleation rate is bigger than of APT crystal growth rate as temperature increasing and the granularity of crystal product is fine.

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