Study On Friction And Wear Properties Of Ag-G-MoS₂

In this paper, Ag-G-MoS2 composites were fabricated by means of powder metallurgy method, then friction experiment was performed on the composites in different conditions, its friction coefficient and wear loss rate was measured. After friction experiment, wear trace on the surface and abrasive dust was observed by photoelectron spectrograph and stereoscan photograph to study the effect of content to abrasion mechanism in air and N2. Electrical sliding experiment was also performed on the composites to study the friction properties.Ag-G composites could display its self-lubrication and generated complete lubricate films while its antifriction reduced largely in N2. Ag-MoS2 was oxidized in air and MoS2 turned into MoO3 which antifriction is poor, but it could form complete lubricating film in N2 condition, friction coefficient was low. When rubbed in air, Ag-G-MoS2 could form complete film and reduced oxidation, and in N2 it also formed film and adhesion between composites and dual material was reduced. Its friction property was well both in air and N2 condition.When rubbed in air, as mass ratio of MoS2 and G increased, wear loss of Ag-G-MoS2 increased because MoS2 would be oxidized and contraction of G lead to reduction of film completeness and raise of roughness, so antifriction went down and wear loss rate increased. In N2 condition, as mass ratio of MoS2 and G went up, film completeness raised and roughness went down, and hardness got larger, so friction and wear properties became well.In process of electrical sliding, when content of G which conductibility is well increased, the conductibility of film increased and its resistance reduced, so contact voltage reduced, too. And G could inhibit creation of micro arc, kept surface quality well and roughness went down, it reduced the friction force at the same time, so the wear loss rate went down. In sliding process, wear loss of negative brush is less than that of positive brush.