Mechanical and Tribological Properties of Self-Lubricating Nanocomposites Based on POM
Aleksandras Stulginskis University; Riga Technical University
Self-lubricating polymer composite are used more and more in tribological applications. Parts from these composite are good alternatives where conventional elements cannot be employed easily, for example in medical equipment, food industry. They have several advantages in comparison to metal ones: low weight, often no lubrication is required, low noise level, excellent mechanical damping effect, favorable friction etc. Self‐lubrication is characterized by ability to transfer microscopic amounts of material to the mating surface. This transfer process creates a film that provides lubrication and reduces friction over the length [1-2]. This paper focuses on mechanical properties: tensile strength, flexural strength, impact resistance, hardness, density and tribological properties results derived by bloc-on-ring tests. Investigations of friction and wear resistance of polymers and polymers with additives, using the SMC-2 device has been carried out in the present work. Used basic material (POM) and two types of nanoparticles (copper oxide and expanded graphite) by mixing them with five different concentrations (0 %; 0.5 %; 3 %; 7.5 % and 15 %) by volume. The influences of parameters like normal load, speed and time were considered variable value in the wear tests.
Keyword(s): self-lubricating, tribology, wear, friction, nanoparticles, POM
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