OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 27 No. 1 2025 fiber. The introduction of bentonite clay slows down the delamination process and reduces the rate of wear increase compared to PGB0. In the PGB0 sample, friction is caused by the interaction between the severed and broken glass fibers and the asperities on the disk surface, which leads to wear. Bentonite clay particles, which act as a solid lubricant, reduce wear by delaying the transfer of composite material from the sample surface to the disk. Conclusion As a result of the study of the influence of bentonite clay on the wear of PPS + GF composites, the following conclusions were drawn. ● Optimizing clay content reduces wear: adding bentonite clay up to a certain concentration (up to 3 wt %) leads to a reduction in the wear rate. This suggests that moderate addition of clay increases the wear resistance of the composite. The lowest wear (3.6 μm) was observed at a clay content of 3 %, while the wear value for the composite without clay at the same load (20 N) was 5.58 μm. With an increase in load to 40 and 60 N, the wear of the composite without clay (166 and 422 μm, respectively) significantly exceeded the wear of the composite with 3 % clay (58.32 and 112.32 μm, respectively). ● Exceeding the optimal clay content increases wear: at a clay concentration above the optimum, an increase in the wear rate is observed. This is likely due to a change in the mechanical properties of the composite. At a clay content of more than 2 %, a significant increase in wear is observed: at 5 and 9 % clay, the wear values at a load of 20 N are 96.3 and 274.86 μm, respectively. These values significantly exceed the wear of the composite with 2 % clay. A similar pattern is observed at higher loads (40 and 60 N). ● Clay agglomeration impairs wear resistance: a high concentration of bentonite clay can lead to agglomeration of particles in the PPS + GF composite. Agglomerates, acting as an abrasive, increase the wear rate. ● Clay affects the coefficient of friction: the addition of bentonite clay can reduce the coefficient of friction due to its lubricating properties. ● A small amount of clay improves tribological characteristics: a small amount of bentonite clay (up to 3 %) allows for simultaneously reducing wear and maintaining an optimal coefficient of friction, providing a balance between wear resistance and frictional properties. These findings emphasize the importance of carefully optimizing bentonite clay content to achieve the desired balance between wear rate and friction coefficient in PPS + GF composites. Fig. 8. Wear vs Load
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