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Brief Introduction to Molybdenum Disulfide , 2013 - III

1、Lubricant
MoS2 with particle sizes in the range of 1–100 µm is a common dry lubricant. Few alternatives exist that can confer the high lubricity and stability up to 350 °C in oxidizing environments. Sliding friction tests of MoS2 using a pin on disc tester at low loads (0.1–2 N) give friction coefficient values of <0.1.

Molybdenum disulfide is often a component of blends and composites where low friction is sought. A variety of oils and greases are used, because they retain their lubricity even in cases of almost complete oil loss, thus finding a use in critical applications such as aircraft engines. When added to plastics, MoS2 forms a composite with improved strength as well as reduced friction. Polymers that have been filled with MoS2 include nylon (with the trade name Nylatron), Teflon, and Vespel. Self-lubricating composite coatings for high-temperature applications have been developed consisting of molybdenum disulfide and titanium nitride by chemical vapor deposition.

Examples of some diverse applications of MoS2-based lubricants include two-stroke engines (e.g., motorcycle engines), bicycle coaster brakes,automotive CV and universal joints, ski waxes,and even some bullets.

2、Petroleum refining
MoS2 is employed as a catalyst for desulfurization in petroleum refineries; e.g., hydrodesulfurization.The effectiveness of the MoS2 catalysts is enhanced by doping with small amounts of cobalt or nickel and the intimate mixture is supported on alumina. Such catalysts are generated in situ by treating molybdate/cobalt or nickel-impregnated alumina with H2S or an equivalent reagent.

3、Electronics
Sheets of MoS2 can be produced using chemical vapor deposition. Unlike graphene, MoS2 has a bandgap, essential for making transistors. A switchable transistor based on single-layer MoS2 has been described.
 

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