As the density increases, the impact strength of tungsten nylon shielding material successively reduced, but when low density, the moderate amplitude of impact strength is low. When the density is 8.8-11.0g/cm3, the data increases linearly, this is because with the increase of the content of tungsten particles, the voids at the interface also increases linearly, and the impact strength of the composite material with 11.8g/cm3 density decline larger, which is due to high levels of tungsten powder, can not fully wrapped nylon collective particles, the voids at the interface is bigger, so that impact strength has a sharp decline. In the whole, the impact strength of the 11.0g/cm3 density composite has a smaller decline in the acceptable range.

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Research indicates that if density of tungsten nylon shielding material is below 11g/cm3, the composite material can meet the flow behavior of pseudoplastic fluids. When attains 11.8g/cm3 density, since the melt will not have shear-thinning properties, it will not suitable for injection molding. In addition, as the density increases, the shear rate on the non-Newtonian index becomes weaker. When the density is 11.0g/cm3, the shear rate on non-Newtonian index changes caused only minor changes in the non-Newtonian index. As the flow stability have a significant impact on the performance of the final product, the non-Newtonian index changes smaller, flow properties is more stable. Therefore, the 11.0g/cm3 density of the composite material is suitable for injection molding.
 

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Tungsten materials with high density and high atomic coefficients for X-rays have a good shielding performance, it is used as a non-toxic environmentally friendly materials to replace lead in X-ray protection fields. Nylon has excellent flow processing performance, ease of processing into a variety of complex shapes products. Regular arrangement of the molecular structure of nylon and the presence of a large number of hydrogen bonds, it has excellent mechanical properties, chemical properties, and thermal properties. Many automobile, electronics, machinery, aerospace and other fields has been widely used because of superior processing performance, physical properties and mechanical properties of nylon. Tungsten powder was added to the nylon matrix as filler, so it can give the nylon the shielding performance, forming several of complex composite shielding material.
 

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Because of the following excellent properties of tungsten such as high density, high melting point, small volume, excellent hardness, superior wearing resistance, high ultimate tensile strength, high ductility, high temperature resistance, low vapor pressure, gold-plated paperweight, tungsten alloy golden paperweight are the most popular handicraft nowadays.




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Radiation shield capacity is closely related to the density of the material, the greater density, better the shielding performance, therefore, tungsten alloy which has a high density becomes the best shield material. Tungsten alloy shields include gamma radiation shielding, shielding blocks, oil drilling equipment, X-ray collimator, tungsten alloy PET shield, shielding cancer treatment equipment etc. More and more radiation shielding equipment demand is growing now. China tungsten alloy shield distribution supply structure is as follows:

1. Domestic and international product supply structure.



2. Domestic regional supply structure.


 

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Early medical shield is made ​​of lead, but lead shield’s hardness is low, will cause the secondary pollution and poisoning. Relative lead shield medical, high density tungsten alloy medical shield is resistance to acid, wear-resistant properties. Moreover, lead belongs to heavy metal pollution, it is harmful to the environment, but the tungsten alloy is kind to the enviroment. Therefore, tungsten alloy replace lead, becoming the material for medical shield.

Tungsten alloy shield including radiological protection gallipot medical, radiation shielding storage, agamma radiation shielding, shielding blocks, oil drilling equipment, and X-ray collimator.

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Although tungsten alloy shield has good radiation protection performance, mechanical properties, compressive strength, and environmental friendly, but its price is 13 times higher than lead shield, so choose the right shielding materials based on different occasions, individual equipment surrounding and efficient use.

For example, in nuclear power plants, due to the adaptability of existing inventory, cost and lead shielding materials stocks, replacing the overall lead with tungsten is not realistic. Under normal conditions, when the lead shielding can meet the requirements although reducing the amount, there is no need to use tungsten shielding. When faced with specific applications, such as underwater applications, the shield case structure, or severely limited space, or the mechanical properties and mechanical strength such important places, tungsten shielding can effect the function.


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Lead shielding has insurmountable drawbacks, such as it will generate a secondary bremsstrahlung, hardness is low, and the lead itself is heavy metal pollution, it will lead to heavy metal toxicity during use.

Opposite to the lead shielding, tungsten shielding do not react with the particles, and it is non-toxic, can better overcome the drawbacks of lead shielding and eliminate the toxicity hazards associated and mixed waste disposal costs.

Tungsten is sufficient now, but the price is much higher than lead, however, the cost difference can not conceal the advantage of tungsten shielding.


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Shielding is a method of limiting electromagnetic waves within a certain area by the shell, box, the plate etc. Radiation source includes electric near field, the magnetic field source and far zone plane wave, thus based on the different radiation source to choose the differnt material, structural shapes, and on hole leak control and other aspects. To achieve the required shielding performance, you need to first determine the source of radiation, a clear frequency range, according to the typical structure of each band leakage, determine the control elements, and then select the appropriate shielding materials, design shield case.

Tungsten alloy shield has good radiation protection performance, strong mechanical properties, compressive strength, environmentally sound and other features, it has great prospects.
 

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With the rapid development of nuclear science and applications, a variety of rays are widely used in various fields of medicine, food radiation etc., as green healthy living concept deeply rooted, so human gradually recognize the damage of ray will bring to them and the environment. Other than the traditional materials such as lead, iron and water, tungsten alloy has been identified as the best radiation shielding material.

Tungsten alloy shields used in medical, industrial shielded, oil and gas wells, automotive, military, and industrial, sports and entertainment, resistance welding, high pressure switch or circuit breaker contacts etc.

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