Molybdenum disulfide and its special crystal structure are the basis for its excellent lubricating properties. Molybdenum disulfide is a hexagonal structure of layered triangular polyhedrons with six sulfur atoms distributed around each molybdenum atom. The wide layer spacing and the low interlaminar bonding strength determine the extremely low shear strength of molybdenum disulfide in the direction parallel to the plane of the layer and the extremely high strength and hardness in the vertical direction, resulting in extremely low slip of molybdenum disulfide. Friction coefficient. This property does not change even if impurities are present in the crystal.
Molybdenum disulfide can firmly adhere to the collective film, and this good adhesion can carry friction under high load. The actual friction coefficient of molybdenum disulfide depends on the composition of the formed film, bearing capacity, ambient temperature, humidity, thickness, and impurities. For a pure, smooth, properly oriented film, the coefficient of friction can reach 0.02.
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