Fyzikální a mechanické vlastnosti kovo-keramických frikčních kompozitů

Abstract

The aim of the diploma thesis was the study of structural characteristics and selected physical and mechanical properties of two types of friction metal-ceramic composites based on Cu-Sn-Fe-Al2SiO5-graphite (sample A1) and Cu-Sn-Pb-Fe-SiO2-grafit (sample B1). The area chemical composition of samples was determined and the principal phases of structure of both materials were identified using SEM/EDX analysis. The density and porosity of these friction materials were also evaluated, where the composite A1 showed almost two-times higher portion of open porosity in comparison with the composite B1. The composites were submitted to the compressive strain test at room and elevated temperatures, the hardness test and shear test according to established standards for the testing of brake lining of road vehicles. The composite A1 exhibited a lower compressive strength, lower shear strength and lower hardness than the composite B1, which is related to the porosity and the phase composition of both friction composites.