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    WC VE TiCN KAPLANMIŞ SICAK HADDE MERDANELERİNİN KURU VE BOR YAĞI ORTAMINDA AŞINMA DAVRANIŞLARININ İNCELENMESİ
    (2020-10-23) Pehlivanoğlu, Mert
    In this study, the effect of TiCN and WC-Co coatings on the tribological performance of spheroidal graphite cast iron materials was investigated by wear tests. Mechanical and physical effects of coating processes were analyzed by microhardness measurements and imaging methods (SEM, EDX, XRD). The tribological effect of WC-Co and TiCN coated samples was investigated by ball-on-plate abrasion tests carried out under dry and 5% concentration prepared boron oil emulsion conditions at 50N load and 60 rpm sliding speed parameters. Friction coefficient and wear volume data were obtained to examine the effect of coating process and boron oil emulsion on friction and wear behavior. Erosion mechanisms were determined with SEM images obtained from worn surfaces, surfaces were analyzed elementally with EDX images. In addition, surface roughness measurements and 2D - 3D topography images and surface form changes were examined. According to the microhardness measurement results, it was observed that the spheroidal graphite cast iron with 290 HV hardness reached 1559 HV with TiCN coating and 1440 HV with WC-Co coating. According to the abrasion test results, it was determined that TiCN and WC-Co coatings decreased the friction coefficient by 54.78% and 41.58%, and the wear volume by 88.33% and 75.92%, respectively. When the effect of boron oil use on wear performance compared to dry environment conditions is examined; It was concluded that the friction coefficient and wear volume decreased by a maximum of 66.99% and 53.70%, respectively. According to the surface morphology analysis results, it was seen that the roughness values decreased in the experiments where the boron oil emulsion was used. However, although the TiCN coating improved the surface quality, the WC coating negatively affected the surface quality. Surface form images obtained with 2D and 3D topography also support the change in roughness values.