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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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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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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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.




Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-alloy.com
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