OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 27 No. 1 2025 load, sliding speed, and composition on the tribological characteristics of PPS reinforced with 40 % glass fiber and containing various concentrations of clay. The results show that increasing the content of clay particles and their distribution in the PPS matrix contributes to the accumulation of wear debris. This debris is formed as a result of adhesive wear at the contact interface between the composite surface and asperities on the steel disk, which act as abrasive particles. The tribological behavior of this wear debris is determined by the relative height of the asperities on the surface of the steel counterface. It was found that the minimum coefficient of friction corresponds to the composite containing no clay. The addition of 2 % clay leads to an increase in the coefficient of friction, while a further increase to 5 % causes a decrease in the coefficient of friction. Detailed information about the composition of the investigated materials is presented in Table 1. Ta b l e 1 Materials and Method Sr. No. Sample PPS [wt. %] GF [wt. %] Clay [wt. %] 1. PGB0 62 30 0 2. PGB1 60 30 2 3. PGB2 55 30 5 4. PGB3 50 30 9 Ta b l e 2 Test parameters Sliding Speed v [m/s] ± 5 % Pressure p [N/mm2] ± 5 % Load N [N] ± 5 % Time [min] 2.045 0.27 30 20 min 4.085 0.52 50 50 min 6.127 0.78 70 80 min Bentonite clay (aluminum phyllosilicate) is a common component used in combination with PPS and 40 % glass fiber to create an environmentally safe PPS composite. Wear tests were carried out on a DUCOM TR-20-M26 friction machine using a pin-on-disk configuration, providing continuous contact between the sample (pin) and a rotating disk. The experiments used a cylindrical pin with a height of 40 mm and a diameter of 10 mm, in contact with a flat surface of a steel disk with a diameter of 300 mm and a thickness of 12 mm. The disks were made of 41MoCr11 steel with a hardness in the range of 55–58 HRC. The steel pins were made of composite material with carefully selected compositions. The surfaces of the pin and disk were cleaned with a tension-activated operator before each test. Each test was repeated five times using new pins and disks while maintaining constant parameters. The tests were carried out under dry friction conditions to maintain a constant temperature throughout a sliding distance of 33,085.26 m. The experiments used three sliding speeds: 2.0423 m/s, 4.0846 m/s, and 6.1269 m/s, as well as three levels of contact load between the pin and disk. The values of the test parameters for each level are presented in Table 2. The experimental design was developed in accordance with the ‘Taguchi L9’ array, which involved conducting nine tests for each material composition. The purpose of this study was to determine the wear rate and coefficient of friction of six different PPSbased composites with 40 % glass fiber and varying clay contents. The materials were provided by DN Polymers, located in Chinchwad, Pune. Before and after testing, the samples (pins and disks) were weighed on precision analytical balance. Morphological studies of the worn surface were performed using scanning electron microscopy (SEM).
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