Antifriction properties of materials used as dry lubricants

1. Graphite reduces both the friction coefficient and the extent of wear of sulfides and improves their performance elevated temperatures. 2. The particle size of dry lubricants affects their friction properties. As exemplified by MoS2 and graphite, the finer the powder the lower is the friction coefficient and the extent of wear. 3. At high sliding speeds (up to 35 m/sec) molybdenum disulfide, graphite and mixtures of graphite with zinc, copper or molybdenum sulfides can be used as lubricants; they show some promise as potential components of composite materials for service under conditions of dry or lubricated friction.