Abstract: In recent years, materials scientists have paid particular attention to developing polymer composite materials for tribotechnical purposes, which can be used in friction units and become an alternative to traditional metal materials. This paper presents the results of a study of the effect of talc on the physicomechanical and tribotechnical properties of polytetrafluoroethylene (PTFE). Due to its frost resistance, chemical resistance, and low coefficient of friction of the polymer, PTFE is suitable for the development of composite materials that can be operated in the Arctic. Improvement of the performance properties of PTFE is achieved by introducing dispersed and fibrous fillers of various nature. The most suitable fillers for PTFE are aluminosilicates, which increase the material's wear resistance; in addition, they are widespread and have a relatively low cost. In this work, polymer composite materials based on polytetrafluoroethylene with talc were prepared, preliminarily mechanically activated in a planetary mill. It is shown that the introduction of talc into PTFE increased the elasticity of the materials while maintaining the strength characteristics. The wear resistance of the materials is increased up to 193 times compared to the original polymer. The friction coefficient of composites remains at the level of anti-friction materials. IR spectroscopic studies of the surfaces of the composites showed the occurrence of tribooxidation reactions during friction. The developed materials based on PTFE and mechanically activated talc can be used in friction units of machines and equipment, where the use of lubricants is limited or unacceptable.
Index terms: polytetrafluoroethylene, talc, polymer composite materials.


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