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Tungsten is a metallic element, the chemical symbol is W. Atomic number is 74, relative atomic mass is 183.85, atomic radius for 137pm, and density is 19.35 g/cm?.
Application:
Product Specification:
Model |
10 |
15 |
20 |
30 |
40 |
55 |
70 |
15 |
Fisher Particle Size μm |
1.01-1.5 |
1.51-2.0 |
2.01-3.0 |
3.01-4.0 |
4.01-5.5 |
5.51-7.0 |
7.01-15 |
15.1-20 |
Oxygen Content <=, % |
0.3 |
0.3 |
0.25 |
0.25 |
0.25 |
0.2 |
0.2 |
0.1 |
Impurity Content:
Brand |
Impurity content(%), less than |
||||||||
Pb |
Bi |
Sn |
Sb |
As |
Mn |
Mo |
Fe |
Al |
|
FW-1 |
0.0001 |
0.0001 |
0.0003 |
0.0005 |
0.002 |
0.001 |
0.005 |
0.005 |
0.001 |
FW-2 |
0.001 |
0.001 |
0.001 |
0.001 |
0.002 |
0.001 |
0.010 |
0.030 |
0.002 |
FWP-3 |
0.001 |
0.001 |
0.001 |
0.001 |
0.002 |
0.001 |
0.010 |
0.030 |
0.005 |
Brand |
Impurity content(%), less than |
||||||||
Ni |
Mg |
Cu |
Ca |
Si |
Na |
K |
P |
C |
|
FW-1 |
0.002 |
0.001 |
0.0007 |
0.002 |
0.002 |
0.002 |
0.001 |
0.001 |
0.005 |
FW-2 |
0.004 |
0.002 |
0.001 |
0.004 |
0.005 |
0.003 |
0.001 |
0.003 |
0.008 |
FWP-3 |
0.004 |
0.002 |
0.001 |
0.004 |
0.005 |
0.003 |
0.002 |
0.003 |
0.010 |
Production Process:
Reducing tungsten trioxide or ammonium paratungstate by hydrogen reduction furnace (electric furnace of rotary furnace).
The process of hydrogen reduction of tungsten powder needs two steps:
- The first step in 500~700℃ and reducing WO3 to WO2;
- The second step in 700~900℃,Reducing WO2 to tungsten powder.