Proceedings of SerbiaTrib '13

The test contact pair meets the requirements of theASTM G77-05 standard. It consists of the rotationaldisc with the diameter of D d =35 mm and the width ofb d =6.35 mm and of the stationary block of the width ofb b =6.35 mm, the length of l b =15.75 mm and the heightof h b =10.16 mm. The discs were made of 90MnV8steel with hardness of 62 HRC and the surfacesroughness of R a =0.40 m. The blocks were made of thetested ZA27/5%SiC/3%Gr.3. THE RESULTS AND DISCUSSIONThe variations of dry sliding wear volume loss arepresented in corresponding diagrams in the paper,depending on the sliding distance and for differentvalues of sliding speeds and contact loads. The resultsof wear for given hybrid composite and for ZA27alloy were presented in the same diagrams in order tounderstand the wear process evolution during testsand to make corresponding comparisons. Solid lineson the diagrams refer to the wear scar widths of thecomposite, while the wear scar widths of the ZA27alloy are denoted by dashed lines.The variation of dry sliding wear volume losswith the sliding distance for different applied loadsand for a sliding speed of 0.25 m/s is presented inFigure 4. All diagrams are given for the slidingdistance of 300 m.Wear, mm 3 x10 -3Figure 4. Variation of wear volume of ZA27 alloy andZA27/5%SiC/3%Gr composite against sliding distance fordifferent contact loads and for sliding speed of v=0.25 m/s.Wear, mm 3 x10 -3140012001000800600400200140012001000ZA27, F1=10 NZA27, F2=20 NZA27, F3=30 NComposite, F1=10 NComposite, F2=20 NComposite, F3=30 Nv 1 = 0.25 m/s00 50 100 150 200 250 300800600400200ZA27, F1=10 NZA27, F2=20 NZA27, F3=30 NComposite, F1=10 NComposite, F2=20 NComposite, F3=30 Nv 2 = 0.5 m/sSliding distance, m00 50 100 150 200 250 300Sliding distance, mFigure 5. Variation of wear volume of ZA27 alloy andZA27/5%SiC/3%Gr composite against sliding distance fordifferent contact loads and for sliding speed of v=0.5 m/s.The variation of wear volume loss of ZA27alloy and ZA27/5%SiC/3%Gr composite dependingon the sliding distance and for different appliedcontact loads and the sliding speed of 0.5 m/s maybe seen in Figure 5.Diagram in the Figure 6 presents the variation ofwear volume loss of ZA27 alloy andZA27/5%SiC/3%Gr composite depending on thesliding distance and for different applied contactloads and the sliding speed of 1 m/s.Wear, mm 3 x10 -314001200100080060040020000 50 100 150 200 250 300Figure 6. Variation of wear volume of ZA27 alloy andZA27/5%SiC/3%Gr composite against sliding distance fordifferent contact loads and for sliding speed of v=1 m/s.Wear, mm 3 x10 -3140012001000800600400200v 3 = 1 m/sZA27, F1=10 NZA27, F2=20 NZA27, F3=30 NComposite, F1=10 NComposite, F2=20 NComposite, F3=30 NZA27, F1=10 NZA27, F2=20 NZA27, F3=30 NComposite, F1=10 NComposite, F2=20 NComposite, F3=30 NSliding distance, ms = 300 m00 0.2 0.4 0.6 0.8 1 1.2Sliding speed, m/sFigure 7. Wear volume of ZA27/5%SiC/3%Gr compositeand ZA27 alloy depending on sliding speeds, for differentcontact loads and for sliding distance of 300 m.The wear volume losses of the alloy and thecomposite increase with the increase of the slidingdistance. The wear volume loss curves are of thesame character, both for alloy and for the observedcomposite material. The only difference may beseen in level of wear. At the beginning, a largerslope of the curves is noticeable, so there is theintensive initial wear of the composite material. Arapid increase of wear volume loss is characteristicfor sliding distance of approximately 35 m. Afterreaching the zone of constant wear, the wearvolume loss has slight, almost linear increase.Generally, the wear behaviour of the testedmaterials is characterized by very intensive wearduring initial period, after which there is a period ofstabilization. Wear of the composites was alwayssignificantly lower when compared to wear of thematrix ZA27 alloy.13 th International Conference on Tribology – Serbiatrib’13 143