The effect of refractory fillers on improving the tribotechnical characteristics of antifriction self-lubricating polymer composite coatings

DOI: 10.62564/M4-ОK1748

Eugen Pashchenko, Denys Savchenko, Oksana Kaidash, Svitlana Kukharenko, Sergiy Skorokhod, Roman Kurganov

V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine


To increase reliability and increase maintenance intervals, it is advisable to switch to dry friction units. The most promising is the development and application of self-lubricating polymer composite coatings. This is especially important for the operation of materials in conditions of high sliding speeds and high temperatures (up to 250 °C). The residual strength of the adhesive bond of the synthesized composites with the materials of the friction pair parts after heat treatment (300 °C, 100 h) was evaluated for 3 composite compositions based on polyimide binding synthesized polyimides with structurally rigid fragments (diallyl esters of dicarboxylic acids, crosslinked with ferrocene derivatives ) with fillers – finely dispersed (0.3–3 μm) SiC, TiCN, TiB2 powders. The developed anti-friction self-lubricating coating made of diallyl esters of dicarboxylic acids synthesized by us, cross-linked with ferrocene derivatives, has a coefficient of friction on steel in the range of 0.02–0.05 with wear resistance 4–5 times higher than that of polytetrafluoroethylene. According to the results of bench tests, the most promising composition of the self-lubricating composite was determined. Based on the set of characteristics, a polyimide bonded composite based on ferrocene dicarboxylic acid, filled with finely dispersed silicon carbide powder, was chosen. The use of the developed self-lubricating coating based on high-molecular polymer binders with high mechanical strength with axial cross-linking of oligomeric chains by molecules of diallyl ester of ferrocene dicarboxylic acid leads to an increase in tribotechnical characteristics, which consist in a significant reduction of the coefficient of dry friction in solid lubricating coatings at high loads.

Keywords
self-lubricating coating , ferrocene dicarboxylic acid, diallyl ester , coefficient of dry friction

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