Laboratory tribological tests of metal-laying plastic greases
2020
Balabanov, V., Russian State Agrarian Univ. − Moscow Timiryazev Agricultural Academy (Russian Federation) | Ostrikov, V., All-Russian Scientific Research Inst. for the Use of Machinery and Oil Products in Agriculture, Tambov (Russian Federation) | Ishchenko, S., Primorsky State Agricultural Academy, Ussuriysk, Primorsky Krai (Russian Federation)
The literature-patent analysis shows that the use of metal-clad plastic lubricants in transmission elements, the chassis of automotive vehicles and parts of various equipment is quite effective in order to increase the scoring resistance, wear resistance and partial restoration of microdefects of rubbing surfaces. The paper presents the results of laboratory tribological testing of well-known metal-clad plastic lubricants. The tests were carried out on a Timken-Machine friction machine according to the “ring-roller” scheme with friction of the upper roller specimen along the lower ring specimen made of ШХ-15 ball-bearing steel. Test modes: specific pressure in the contact zone p = 10 MPa, sliding speed v = 1.83 m•sE−1, lubricant was supplied to the friction zone by spreading, the time of one test was t = 3600 s. The study of the chemical composition of the coating and the transition zone of the friction surface formed during friction in the presence of metal-clad lubricant was performed using a Cambridge Instrument Stereoscan-360 scanning microscope. For comparison, the results of the tests of the same structural materials with Litol 24 grease without additives were taken. It has been established that the use of metal-clad plastic greases can reduce the wear of prototypes in comparison with the base Litol 24 grease on average from 3.5 mg to 1.5−0.2 mg (from 2.1 to 16 times), and the use of a metal clad developed by the authors Metal Plus grease provides restoration of the weight of samples by an average of 0.1 mg due to the formation on the friction surfaces of a composite copper-tin-nickel coating with a thickness of about 1.0 μm, as well as a diffusion zone with a depth of up to 12.5 μm, due to what increased wear resistance of samples is achieved and partial restoration of worn friction surfaces.
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