Performance difference between tungsten disulfide (WS2) and molybdenum disulfide (MOS2)

　　As the two major series of solid dry film lubricating coatings: tungsten disulfide (WS2) and molybdenum disulfide (MOS2), molybdenum and tungsten are chemical elements of the same group, and tungsten is heavier than molybdenum and has more stable chemical properties.

　　The film thickness of tungsten disulfide (WS2) is about 0.5μm relatively uniform, and it will not bring too much shape change to the parts. It is more suitable for precision parts (such as bearings/molds/medical equipment, etc.). Tungsten disulfide (WS2) Will reduce the friction coefficient, the friction coefficient can be reduced to 0.030 to inhibit carbon accumulation, reduce wear, seizure and other problems, overcome or reduce mechanical lubrication problems, and improve the working efficiency and service life of the machine. Moreover, it has strong adhesion and is not easy to separate. It still has the effect of lubrication and wear resistance at high and low temperatures of -273°C-650°C (it can work at 1200°C in a vacuum environment without decomposition). The standard load reaches 100,000PSI (or the same as the carrying capacity of the substrate).

　　Molybdenum disulfide (MOS2) is a heat-cured solid lubricant containing MOS2 as a lubricating component and an organic binder. Molybdenum disulfide (MOS2) has good wear resistance and is suitable for high-load applications. Molybdenum disulfide (MOS2) is suitable for -220℃-400℃ working environment, the normal range of coating thickness is 5-30μm, and it can also be adjusted according to customer needs. Molybdenum disulfide (MOS2) friction coefficient can be reduced to 0.02-0.06, with a certain load capacity> 160,000 psi ASTM 2625, and a certain corrosion resistance 24-1000H @ 5% neutral salt spray.

　　Above 　　, generally speaking, the film thickness of tungsten disulfide (WS2) is relatively uniform 0.5μm, which is suitable for precision parts with small tolerances and extreme high and low temperature environments, but does not increase its salt spray resistance and is affected by its substrate. Molybdenum disulfide (MOS2) film thickness distribution will have a tolerance of ±5μm. After coating, the substrate will have a certain degree of lubrication, wear resistance and salt spray resistance. The salt spray test can reach up to 300-1500 H, which has good corrosion resistance. performance. It is insoluble in water, acid-resistant, alkali-resistant, and resistant to high mixed gas and liquid.