Analysis of surface layers and wear products by Mössbauer spectral analysis

► Increased wear resistance is effected by transfer of particles arising between co-acting surfaces. ► It is also is effected by presence of quantities of FeO and Fe3O4, and absence of Fe2O3 in the friction area. ► Particles remaining in the system migrate between cooperating surfaces. ► Processes of frictional hardening produce the so-called secondary frictional structure. ► Stabilisation of the friction coefficient can control wear.