The introduction of composite waste materials containing reinforcing fibres and various fillers in friction material components could lower the costs of friction composites production and contribute to a considerable decrease of the load to the natural environment. Therefore, the influence of these materials on tribological properties of friction composite materials was investigated. The basic material was an asbestos free friction material intended for the production of clutch linings in tractors and agricultural machines. This material is a composition of organic and inorganic fibres, ceramic and metallic components combined by means of a resinous-rubber matrix. The initial material was selected on purpose, since it is characterized by quite low-thermal resistance at an elevated working temperature and an improvement of its functional properties is economically justified. The recycle granulated product was admixed to the basic composition of the friction material by means of dry mixing technology and from the admixtures prepared some test pieces were pressed for the investigation, applying standard processing parameters. The recycle material (carbonized or uncarbonized) introduced into the initial material replaced the reinforcing fibres, in one case ceramic fibres and in the other organic ones. Additives of recycle material of epoxide composite reinforced with glass fibres were introduced into this friction material. Influence of carbonization on thermal properties was made by pyrolysis at 400, 800 C deg and under isothermal heating for 10 h at 400 C deg. The results reveal that an additive of composite recycle material has an advantageous influence on the friction coefficient value stabilization at an elevated temperature and limits the phenomena of thermal destruction of the friction material, which allows to increase the temperature of using the friction material. The investigation made allowed to determine in what way the recycle granulated composite additive will influence the friction characteristics and if its additive can substitute ceramic or organic reinforcing fibres.


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