|
The Property Comparison of Tungsten and Lead |
|
|
Lead |
Tungsten |
|
atomic number |
82 |
74 |
|
density |
11.34g/cm3 |
19.3g/cm3 |
|
Melting point |
327.5℃ |
3410℃ |
|
boiling point |
1740℃ |
5900-6000℃ |
|
Hardness |
Soft (Mohs' hardness 1.5) |
>400(HV30) |
|
Thermal conductivity |
30w/m·k |
167w/m·k |
|
linear expansibility |
24*10-6 /K |
4.36*10-6 /K |
|
Compressive strength |
small |
>700MPa |
|
The effect of shielding X-ray radiation |
Not good |
Above 3 times better than lead in the same thickness |
|
toxicity |
Heavy metal, toxic |
Non-toxic, environmental friendly |
|
Government Policy |
Restrict |
Encourage new tech-product |
|
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 |
|
Market development future |
Government restriction will pose heavy and the future is unpromising. |
Tungsten has a promising future, the future development direction |
|
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 |
