Wolfmet tungsten alloys are generally used by aerospace designers for balancing components or reducing vibration. The high density of Wolfmet materials allows maximum sensitivity from optimum mass and is particularly valuable in situations where a large mass has to be contained in a confined space.

 

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Heavy Alloy is a tungsten-group sintered alloy consisting tungsten and binder phase with nickel, copper, iron, etc.

 

Typical material characteristics of Heavy Alloy are following.

▪ High density 

▪ Excellent radiation shielding effect 

▪ Superior machinability to tungsten 

▪ High mechanical strength 

▪ Low thermal expansion and high thermal conductance 

▪ Excellent oxidation resistance 

 

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On the radiation shielding effect of Heavy Alloy, we examined a comparative evaluation with lead. Fig.1 shows the attenuation 

rate of γ-ray (Co60) against the change in thickness of Heavy Alloy and lead. The γ-ray (Co60) used for the evaluation this time is that eradiated from relatively a high energy zone, which becomes an issue in the case of nuclear power station. 

This evaluation proves that Heavy Alloy of about 3mm or 7mm thickness has the radiation shielding effect equivalent to lead 

of about 4.5mm or 10mm thickness respectively. Consequently,

 

Heavy Alloy, compared with lead, has 1.5 times shielding effect against γ-ray (Co60).

 

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The density of tungsten is 60 percent higher than that of lead. That is why even thinner layers of tungsten are able to provide 

reliable shielding against radiation. 

 

Tungsten is particularly suitable as a shielding material. It consists of tungsten and a small proportion of nickel-iron. Like 

tungsten, the material has excellent shielding properties. 

 

However, it is also considerably more ductile than tungsten and can therefore be machined better.

 

Thanks to the ductility and high melting point of the material, isotope containers made from tungsten are also able to withstand 

extreme mechanical and thermal loads.Because of their high strength, tungsten components act as both the support structure 

and the shielding in one. Unlike when lead is used, no additional steel support structures are required.

 

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