Investigation of friction and wear behavior of the metallic composites which have a laminate structure

With this study, it is aimed to produce laminated composites by combining metallic friction materials with different characters in layers by casting and to determine the friction and wear behavior of the produced composites under different friction conditions. For this purpose, lead bronze alloy (Cu6Sn12Pb), GG25 and Ni3Al intermetallic compound were used as laminated layers of the composite. In this composite, bronze was used as the matrix element, Ni3Al was used as the wear-controlling element, and GG25 was used as the friction controlling element. Within the scope of the study, three friction materials with different friction characters were prepared as thin laminates parallel to each other. Firstly, each component of the composite was tested with the CSM Tribometer device in accordance with ASTM G99 method and the friction and wear behaviors were determined for different friction conditions. Laminated metallic composites of different thicknesses were tested under similar conditions and their friction and wear behavior was examined and compared with the friction and wear behavior of the components. The wear surfaces were analyzed by optical microscope and scanning electron microscope to determine the wear behavior of all materials. Generally, brake pads are expected to have a coefficient of friction in the range of 0,35-0,55. According to the results obtained, the friction coefficient values of the composites were found to be 0,79 at the highest and 0,46 at the lowest. These values show that the friction coefficient value can be reached to the desired value by changing the component ratios of the composite materials.