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    Effects of Rice Husk Ash Particles on Tribological Properties of Bronze Matrix Composite Brake Pads
    (International Institute for the Science of Sintering (IISS), 2025) Sugozu, Ilker; Kus, Husamettin; Avcu, Adem
    The objective of this study was to examine and compare the physical, mechanical, and tribological properties of hybrid bronze metal matrix composite brake pads reinforced with fly ash and rice husk ash (RHA). To this end, metal matrix brake pad samples with various ratios of rice husk were prepared by hot pressing method. Density, hardness, friction coefficient, friction stability, and specific wear rate values were ascertained for the produced samples. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) were employed to analyses the microstructure and wear surface. Results indicated that with the increase in rice husk ratio, the hardness value increased, whereas the density decreased. Furthermore, an augmentation in the friction coefficient values was attained by increasing the ratio of rice husk. The highest friction coefficient among all the samples produced was determined in the RHA-8 sample, with a value of 0.462. However, the lowest specific wear value was obtained in the RHA-6 sample, with 4.33 x 10-6 cm3/Nm. The coefficient of friction values obtained from all the samples produced were measured to be in the range of 0.3-0.6, which is the desired range for use as a brake pad material in automotive applications. This study demonstrated that RHA, an agricultural byproduct, may be utilized effectively in brake pads, thereby reducing production costs and enhancing the performance of the pads.
  • [ X ]
    Öğe
    Red Mud Ratio Effects on the Tribological Performance of Fly-Ash-Reinforced Bronze Matrix Brake Pad Material
    (Springer, 2024) Kus, Husamettin; Avcu, Adem; Sugozu, Ilker
    Different amounts of red mud (0%, 2%, 4%, 6%, and 8%) were added to bronze matrix brake pad material reinforced with 12% fly ash and then hot-pressed at 800 degrees C and 40 MPa for 5 min. Wear-friction tests were conducted to determine the friction coefficient and specific wear rate, which are important indicators for evaluating the performance of brake pad samples. For all samples, the hardness and density were determined, fractured surfaces and microstructures were examined, and transverse rupture strength (TRS) was calculated using a three-point bending test. The hardness values of the samples increased with increasing red mud content, and their density values slightly decreased. TRS values of the samples increased with up to 4% red mud addition, but decreased when above 4%, and the friction coefficient of the brake pad samples decreased with an increase in red mud content. Moreover, all samples containing red mud, except the sample containing 2% red mud, showed a lower specific wear rate than the bronze matrix brake pad material reinforced with 12% fly ash. The worn surfaces of the specimens were also examined using scanning electron microscopy (SEM) and a 3D optical profilometer.