Solid lubricants: Molybdenum disulfide

January 9, 2018 8:00 am

In recent articles we have discussed the nature of oils and how they need to be mixed with additives to prepare them for real-world problems. Even synthetic oils need additives to be cleaner and more stable than raw oil. However, even after the necessary additives, there is still a way to further upgrade your oil: solid additives. Enter the molybdenum additive.

Origin and main benefits

Molybdenum is classified as a metal in the Periodic Table of the Elements. In its natural form it can be found as molybdenite (also called molybdenum disulphide or MoS2).

All forms of Molybdenite have a layered structure, making this mineral an excellent lubricating material. Furthermore, the shear strength of molybdenite increases as the coefficient of friction increases, a property known as superlubricity. Do we need to say more?

Molybdenum additive uses

Thanks to its naturally low friction, liquid-molybdenum is widely used as an additive. MoS2 particles, around 1–100 µm in diameter, maintain a high lubricity and stability at engine operating temperatures in extreme and regular conditions.

It is commonly added to graphite in order to improve sticking. For that reason, you can see Molybdenum-based oils in critical applications such as aircraft engines because they keep their lubricity even in oil loss cases.

MoS2 is also employed as a catalyst in the petrochemical industry.

Molybdenum in Xenum

In our range of products we have two molybdenum additives. These are Super G and MG Gear, two products that have the aim of reducing friction in two critical friction points: the engine and the gearbox.

Super G and MG Gear - Solid additives with liquid molybdenum like Liqui-Moly

In both cases the molybdenum is mixed with carbon graphite, one of our most commonly used solid lubricants. We wil talk about that specific lubricant in future articles, so…

Stay tuned!

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