Difference Between Tungsten Disulfide and Molybdenum Disulfide
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- Category: Tungsten Information
- Published on Monday, 15 February 2016 16:46
- Written by Cristina
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Tungsten disulfide can take place of molybdenum disulfide in almost every field with even more wider application. Molybdenum and tungsten is in the same phrator of chemical element, chemical property of tungsten is more stable and higher molecular weight. Molybdenum is widely used due to its low price and high efficiency of marketing supplement. In fact, tungsten disulfide is not newly developed product, its application history is all the way with molybdenum disulfide. Due to its high price, it is firstly used in NASA aerospace, military, automobile industry and so on. A few years ago, price of tungsten disulfide is ten times higher than molybdenum disulfide. Nowadays price of molybdenum disulfide is increasing rapidly. And the price of these two materials is the same. So it would be more valuable if tungsten disulfide is used.
Differences between tungsten disulfide and molybdenum disulfide:
Note：PSI=6.89×103Pa
|
Property |
Tungsten Disulfide(WS2) CAS No 12138-09-9 |
Molybdenum Disulfide(MoS2) CAS No 1317-33-5 |
|
Color |
Silver grey |
Blue silver grey |
|
Appearance |
Crystalline |
Crystalline |
|
Melting Point(℃) |
1250～1260 (Decompose) |
1185 (Decompose) |
|
Boiling Point(℃) |
/ |
450 |
|
Density(Kg.m-3) |
7500 |
5060 |
|
Molecular Weight |
248 |
160.08 |
|
Friction Coefficient |
Static state0.07; Dynamic state0.03 |
/ |
|
Thermostability |
594oC(1100oF),COF <0.1 |
316oC(600oF),COF <0.1 594oC(1100oF),= 0.5 |
|
Carrying Capacity |
Coating 2000Mpa (300,000 psi)；Under138Mpa(20,000 PSI)，COF=0.044; Under138Mpa 2756Mpa (200,000～400,000 PSI ),COF reduce to 0.024 |
Coating 250,000 PSI |
|
Lubricant Temperature Range(℃) |
Environmental temperature: -273～650;Vacuum(10-14Torr): -188～1316 |
Environmental temperature : -185～350；Vacuum (10-14Torr): -185～1100 |
|
Chemical Stability |
Inert matters, odorless |
Inert matters,odorless |
|
Magnetism |
Non-magnetism |
Non-magnetism |
|
Electrical Characteristics |
Semi-conductor property |
/ |
|
Rockwell Hardness（HRC） |
30 |
/ |
|
Coating Thickness(Microns) |
0.5 |
/ |
|
Corrosion Resistance |
Slow down the corrosion process but not completely resist |
/ |
|
Coating Material |
Iron, steel, aluminum, copper, plastic and other artificial solid material |
Iron, steel, aluminum, copper, plastic and other artificial solid material |
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