MOS2 mine Molybdenite

1,Lead gray powder,Dissolved in aqua regia,good chemical stability
2,Package:50kg/drum
3,D50um :<5um
4,MOQ:10kg
Production
Molybdenite ore is processed by flotation to give relatively pure MoS
2
, the main contaminant being carbon. MoS
2
also arises by the thermal treatment of virtually all molybdenum compounds with hydrogen sulfide. Molybdenite is the principal ore from which molybdenum metal is extracted.
[edit] Structure and physical properties.
In MoS
2
, each Mo(IV) center is trigonal prismatic, being bound to six sulfide ligands, each of which is pyramidal. The trigonal prisms are interconnected to give a layered structure, wherein molybdenum atoms are sandwiched between layers of sulfur atoms. Because of the weak van der Waals interactions between the sheets of sulfide atoms, MoS
2
has a low coefficient of friction, resulting in its lubricating properties. Other layered inorganic materials exhibit lubricating properties (collectively known as solid lubricants or dry lubricants) including graphite, which requires volatile additives, and hexagonal boron nitride.
MoS
2
is diamagnetic and a semiconductor.
Chemical properties
Molybdenum disulfide is stable in air or oxygen at normal conditions, but reacts with oxygen upon heating forming molybdenum trioxide:
2 MoS
2
+ 9 O
2
→ 2 MoO
3
+ 4 SO
3
Chlorine attacks molybdenum disulfide at elevated temperatures to form molybdenum pentachloride:
2 MoS
2
+ 7 Cl
2
→ 2 MoCl
5
+ 2 S
2
Cl
2
Molybdenum disulfide reacts with alkyl lithium under controlled conditions to form intercalation compounds Li
x
MoS
2
. With butyl lithium, the product is LiMoS
2
.
Use as lubricant
MoS
2
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 MoS
2
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, MoS
2
forms a composite with improved strength as well as reduced friction. Polymers that have been filled with MoS
2
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.