Vpliv strukturnih značilnosti delnokristaliničnega polimernega materiala POM na njegove tribološke lastnosti

Vidergar, Ana (author), Kalin, Mitjan (mentor)

Pri iskanju ustreznega polimernega materiala za želeni končni izdelek se pogosto odločimo za njegovo predhodno testiranje. Navadno testiramo zgolj vzorce materiala, pri čemer se poraja dvom o vplivu njihove geometrije in uporabljene tehnologije predelave na posamezne materialne lastnosti. Vemo namreč, da so le te močno odvisne od značilnosti mikrostrukture, ki se izoblikuje med procesom izdelave vzorca. V zaključnem delu smo preverili vpliv strukturnih značilnosti delnokristaliničnega polimernega materiala na njegove tribološke lastnosti. V ta namen smo na preizkuševališču pin-on-disc testirali različne vzorce materiala POM (ekstrudirane ter dva tipa brizganih vzorcev). Med seboj smo primerjali izmerjene kontaktne temperature, koeficiente trenja, stopnje obrabe ter obrabne mehanizme. Ugotovili smo, da strukturne značilnosti vzorca pomembno vplivajo na velikost stopnje obrabe (lahko več kot 150 % razlike med posameznimi vzorci), ne pa tudi na koeficiente trenja in kontaktne temperature (le okoli 10 % razlike med vzorci). Nadaljnje smo ugotovili, da so bile kontaktne temperature odvisne predvsem od dimenzije vzorca.

• Language: Slovenian
• Keywords: delnokristalnični polimerni materiali, struktura, pin-on-disc preizkuševališče, stopnje obrabe, obrabni mehanizmi, koeficienti trenja, kontaktne temperature
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-95451
• Publication date in RUL: 20.09.2017

Secondary language

• Language: English
• Title: The influence of the structural morphology of the semi-crystalline polymeric material POM on its tribological properties

Abstract

When searching for the appropriate polymeric material for the desired finished product, we often decide to pre-test it. Usually, we test only some samples of the material, which rises the doubt about the impact of their geometry and used processing technology on specific material properties. We know that material properties are strongly dependent on its structural morphology, which is formed during the manufacture process of the sample. In this thesis, we examined the influence of the structural features of a semi-crystalline polymeric material on its tribological properties. For this purpose, we tested various samples of the POM material (extruded and two types of injection moulded samples) at the pin-on-disc tribometer. We compared measured contact temperatures, friction coefficients, wear rates and wear mechanisms. We found that the structural morphology of samples significantly influences the wear rate (the difference between the samples is greater than 150 %), but not the coefficient of friction and the contact temperature (the difference between the samples is only about 10 %). Furthermore, we discovered that the contact temperature is mainly dependent on the dimension of the sample.

• Keywords: semi-crystalline polymeric materials, structural morphology, pin-on-disc tribometer, wear rates, wear mechanisms, friction coefficients, contact temperatures