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Molybdenum Disulfide Coating Services
Molybdenum disulfide (MoS2 ).
Like graphite, MoS2 has a low friction
coefficient, but, unlike graphite, it does not rely on adsorbed vapors or moisture. In fact, adsorbed vapors may actually result in a slight, but insignificant, increase in
friction. MoS2 also has greater load-carrying capacity and its manufacturing quality is better controlled. Thermal stability in non oxidizing environments is acceptable to 1100°C (2012°F), but in air it may be reduced to a
range of 350 to 400°C (662 to 752°F).
There are currently no clear lubrication alternatives to molybdenum disulfide or the very similar tungsten disulfide that can resist temperatures higher than 350°C in oxidizing environments. Research has been conducted on compacted oxide layer glazes, which form during metallic surface sliding wear at several hundred degrees Celsius. However, because these oxide layers are physically-unstable, their use has currently not proven practical.
Applications:
It is often used in two-stroke engines; e.g., motorcycle engines. MoS2 is also used in CV and universal joints. During the Vietnam War, the molybdenum disulfide product "Dri-Slide" was used to lubricate weapons, although it was supplied from private sources, not the military. MoS2-coatings allow bullets easier passage through the rifle barrel with less deformation and better ballistic accuracy.
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