The Property Comparison of Tungsten and Lead
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The Property Comparison of Tungsten and Lead |
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¡¡ |
Lead |
Tungsten |
|
atomic number |
82 |
74 |
|
density |
11.34g/cm3 |
19.3g/cm3 |
|
Melting point |
327.5¡æ |
3410¡æ |
|
boiling point |
1740¡æ |
5900-6000¡æ |
|
Hardness |
Soft (Mohs' hardness 1.5) |
>400(HV30) |
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Thermal conductivity |
30w/m¡¤k |
167w/m¡¤k |
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linear expansibility |
24*10-6 /K |
4.36*10-6 /K |
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Compressive strength |
small |
¡¡>700MPa |
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The effect of shielding X-ray radiation |
Not good |
Above 3 times better than lead in the same thickness |
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toxicity |
Heavy metal, toxic |
Non-toxic, environmental friendly |
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Government Policy |
Restrict |
Encourage new tech-product |
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Influence to the equipment quantity |
EU has prohibited lead using on the electronic and medical equipment, and lead hinders the equipments¡¯ internationalization |
Tungsten is helpful to develop the equipments into more precise and digitalization, and also is the suitable material in enhancing competition of the equipment |
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Market development future |
Government restriction will pose heavy and the future is unpromising. |
Tungsten has a promising future, the future development direction |
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Application condition |
The security inspection/medical equipments in China are stay on the stage of using lead. |
Foreign big companies adopt tungsten alloy products instead of lead in security inspection/medical equipments |
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