The problems of the quality and competitiveness of combine harvesters related to their operation and maintenance remain relevant aspects of the modern agricultural industry. In this regard, the purpose of the research was to develop a polymer nanocomposite material (PCM) for the manufacture of straw bearings for agricultural machinery to enhance their reliability and durability under various operating conditions. This article describes the technological process of synthesis and the test results of a new polytetrafluoroethylene (PTFE)-based PCM, which is highly resistant to wear. A formulation of polymer composite material (PCM) has been developed: PTFE (96 wt.%) + Aerosil grade A-300 (1 wt.%) + TU grade C40 (3% by weight). The nanocomposites were manufactured using the standard technology of cold pressing and free sintering of pressed blanks. The properties of the developed nanocomposite material are explained by the following mechanisms: the addition of aerosil to the formulation contributes to an increase in strength and improved adhesion, due to its high specific surface area, which reduces the deformation of products under load. Nanoscale aerosil particles provide stable adhesion to the polymer matrix, preventing the formation of cracks and tears, which is extremely important to ensure the durability and reliability of the material. The addition of carbon black grade C40 to the composition of the nanocomposite material helps to reduce friction by creating a protective film on its surface, which reduces contact between the rubbing surfaces and slows down the wear of products. This approach increases the durability and reliability of PCM products during operation, especially under high-load conditions. As a result of the study, the optimal wear rate was 2.7•10-4 g/h with a contact pressure of 3.2 MPa and a sliding speed of 2.66 m/s. The developed material can be recommended for use in the production of tribotechnical products of agricultural machinery and equipment. Its use will help to increase the service life of mechanisms, increase the efficiency of agricultural machinery, which will ensure more reliable and high-quality performance of harvesting operations.
combine harvesters, threshing mechanisms, nanocomposite materials, physical and mechanical properties, tribotechnical characteristics
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