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Molybdenum Disulfide Physical Property

Molybdenum disulfide has great physical property so it widely uses in many fields. The major ingredient of molybdenite is molybdenum disulfide. Molybdenum disulfide is kind of leaden to black color solid powder with greasy feel, odorlessness and it is belongs to hexagonal system or orthorhombic system, which renders metallic color on the surface.

The CAS number of it is [1317-33-5]; molecular formula: MoS₂; molecular weight: 160.07; density ratio: 5.06（d₁₅¹⁵）or 4.80（d₄²⁵）; melting point:1185℃; Moh’s hardness: 1.0~1.5. Besides, MoS₂ can not soluble in water and olefine acid but it can be erosion by concentrated sulfuric acid, concentrated nitric acid, boiling concentrated hydrochloric acid, aqua regia, pure oxygen, fluorine and chlorine. And MoS2 in other acid and alkali solvent, petroleum and syntholube is insoluble.

MoS₂ has great chemical stability and thermostability. So usually it won’t react with normal metal surface and will not attack on rubber which is a kind of nonmagnetic material and semiconductor-like property compound. For one thing, molybdenum disulfide has a lot of Mo-S faceted pebble and layer to layer is easy to strip which has great anisotropy. And S has great adhesion on metals which can adhere to metal surface and play lubrication functions. MoS₂ as lubricant has a lot of advantages such as great compressive strength, abrasive resistance, adhesiveness, low friction coefficient (0.03~0.08) and it can be produced to films under high pressure. Under high temperature (1200℃), low temperature（-190℃）, high rotation speed, high pressure, ultralow temperature, vacuum, and has chemical attack conditions the MoS₂ can show effective lubrication performance.

Molybdenum disulfide will be oxidized to molybdenum trioxide at 400℃ and at 540℃ it will sudden oxidation to molybdenum trioxide. Besides, it will sublimate under inert atmosphere and it will decompose at 1370℃. What’s more, at 1600℃ it will decompose to molybdenum and disulfide. On the other hand, MoS₂ and chlorine happens heating reaction can produce molybdenum pentachloride and reacting with lithium alkylide can produce Li_xMoS₂.

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