Properties of Nylon With or Without Molybdenum Disulphide

Propeny Nylon without MoSj Vol % MoSj Nylon with M0S2 Ref 

Risdon and Loban studied the effect of different concentrations of molybdenum disulphide in Nylon 6.6. They found a steady decrease in wear rate as the concentration of molybdenum disulphide increased to 20%, the wear rate at 20% concentration being only 38% of that of the unfilled nylon. With a further increase in concentration to 40% there was a small increase in wear rate, which may have been caused by an increase in brittleness. They found improved wear resistance even at a 2.5% concentration, in contrast to the results in Table 12.6. However, in further 

The main advantage of polyimides is that they retain their structural strength to temperatures approaching 350 C, but they also have good outgassing characteristics in vacuum. For such applications the thermal stability of a PTFE filler is a limitation, and 5% of molybdenum disulphide may be added to a polyimide for friction reduction. The wear resistance of this material was inferior to some of the filled nylons, acetals and polycarbonates, and it would probably be chosen mainly for its high temperature stability. 

Several of the thermoplastics benefit from lubrication with small quantities of liquids, including oils and water, and their friction and wear resistance may then be superior to those of conventionally lubricated bearing materials. The use of molybdenum disulphide fillers probably conveys little or no advantage in these 

Thermosetting resins are usually used lubricated, often with water. When they run in dry situations they benefit considerably from the addition of PTFE, graphite or molybdenum disulphide. Their wear resistance is still not as good as that of the better PTFE composites , but they can be used with higher loads because they are stronger and are not so catastrophically affected by heat. The effect of heat on the polymer is to cause surface charring, which does not seriously degrade performance. 

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Table 12.8 Properties of Nylon With or Without Molybdenum Disulphide...

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