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Fretting wear mechanisms in contact of steel and silicon nitride ceramics : doctoral thesis
Kalin, Mitjan
In this thesis, fretting wear mechanisms in air-dry and oil-lubricated contacts of steel against silicon nitride were studied, with a special emphasis on the maximum temperature rise in the contact ...and the influence of mechanical pressure and plastic deformation on the tribochemical reactions. Tribochemical reactions between the ceramics and metals under various sliding or fretting conditions have been reported many times to critically determine the wear behaviour but the details of the mechanisms and chemical reactions are still not fully understood. That is to say, different and contradictory levels of importance relating to the thermal and mechanical effects on the tribochemical reactions have been reported. Therefore, a number of fretting experiments including various surface analyses like AES and TEM are presented in this thesis. In order to verify the suggested wear behaviour, calculations of surface temperature rise according to some of the most cited modern theoretical models and a number of static interaction couples experiments were performed. In oil-lubricated fretting a transition from mechanical to tribochemical wear, i.e. carbonisation of the steel was observed with increasing displacement amplitude resulting in significantly less wear. In dry fretting, where spalling of the oxidised silicon nitride ceramics dominated, two orders of magnitude higher wear was obtained than in lubricated fretting, appearing as monotonical progress of wear loss with increasing displacement amplitude. Mechanical effects (pressure and plastic deformation) were excluded from having a significant effect on the tribochemical reactions, whereas the high temperature phase transformed material (HTPTM) fretting wear model was proposed for explaining the behaviour under, both dry and lubricated fretting conditions.
Type of material - dissertation
; adult, serious
Publication and manufacture - Ljubljana : [M. Kalin], 1998
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