Proceedings of SerbiaTrib '13

complete. The SEM analysis maycontributee tobetter understanding of this mechanism.The SEMmicrograph of the worn surfacee atload of 10 N and at speed of 0.25 m/s for a slidingdistance of 300 m is presented in Figure 12 forr thetested composite material.Figure 14. Appearance of the worn surface of ZA27alloy photographed by SEM M in dry slidingconditions(vv 1 = 0.25 m/s, , F 1 = 10 N)Figure 12.SEM micrographs of wornsurfaces of theZA27/5%SiC/3%Gr compositeQualitative and quantitative chemical analysesof micro-constituents were performed using energydispersive spectrometry(EDS), Figure 13.Analysess confirm the presencee of constituentelements like: Zn, Al, SiC, Gr (C), as well as thepresence ofFe as a consequence of material transferfrom the counterpart to the compositeblock.Figure 15. Appearance of the worn surface ofZА27/5%SiC/3%%Gr compositephotographed by SEM indry sliding conditions (v 1 = 0.25 m/s, F1 = 10 N)4.CONCLUSIONFigure 13. EDS analysis of worn surface on theZA27/10%SIC/1%Gr compositeMicrostructure of worn surface of ZA27 alloy isshown in Figure 14.Microstructureofworn surface ofZА27/5%SiC/3%Grcomposite is given inFigure 15.Generally, the parallel grooves and scratches canbe seen over all the surfaces in the t directionn ofsliding. These grooves and scratches resulted fromthe contact between theworn surface of the testedmaterial andthe counterdisc of significantly higherhardness.This research was conducted inorder tocomplete the tribological knowledge on developeddcomposite materials with ZA27 alloy reinforced bythe SiC and graphite g particles. The goal was toconfirm the further possibilities for f broaderrapplication of given g composites as advanced tribo-materials, in different d technical systems becauseethey have excellent wear resistance when comparedwith the base ZA27 alloy.By monitoring the wear process throughhobservation of wear volume in dry slidingconditions, the following conclusions can be made: Wear of o the testedd compositeis smallerthan wear w of ZA27 alloy forr all appliedsliding speeds and normal loads. Wear process evolution hass the samecharacter for both tested materials (basicZA27 alloy anddZA27/10%SiC/1%Grcomposite).13 th International Conference on Tribology – Serbiatrib’13145