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Uporaba grafena v kompozitih za zavorne obloge
Skočir, Žiga (Author), Genorio, Boštjan (Mentor) More about this mentor... This link opens in a new window

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Abstract
Sestavni del zavornih sistemov je zavorna obloga. Sestava le te je dokaj kompleksna, saj lahko kompozit sestavlja tudi več kot deset različnih materialov. Vsak posamezni material prinese v kompozit specifične lastnosti, kot so: stabilen in visok koeficient trenja v različnih temperaturnih območjih, mehanska in termična stabilnost ter visoko odpornost na obrabo. To pa pomeni, da je izboljšava tako kompleksnega kompozita zahtevna. V svoji diplomski nalogi sem želel izboljšati zavorne lastnosti zavornega sistema z uporabo grafena. Grafen sem izbral zato, ker gre za material, z izjemnimi mehanskimi in termičnimi lastnostmi. V mojem primeru smo dve mazivi, smukec in grafit, zamenjali z grafenom. Ugotovil sem, da se je zamenjava smukca izkazala za pozitivno. Kompozitu se je povišal koeficient trenja za približno 25%. Poleg tega je bila obraba podobna kot pri vzorcu brez grafena. Na drugi strani zamenjava grafita ni prinesla pozitivnih lastnosti. Koeficient trenja ni bil več konstanten skozi celotno delovanje. Pri tem se je povečala tudi obraba materiala ob primerljivem koeficientu trenja.

Language:Slovenian
Keywords:zavorni sistem, zavorna obloga, grafen, koeficient trenja
Work type:Bachelor thesis/paper (mb11)
Tipology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Technology
Year:2019
COBISS.SI-ID:1538308803 Link is opened in a new window
Views:284
Downloads:174
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Secondary language

Language:English
Title:Graphene composites for brake pads
Abstract:
Brake pads are the main part of any brake system. Their structure is rather complicated, because one composite can be made from more than ten different materials. Every material brings to the composite some specific properties, such as: a constant and high coefficient of friction in different temperature areas, mechanical and thermal stability and high resistance to wear. This means that any improvements to this complex composite is rather challenging. In my diploma thesis I wanted to improve brake properties of a brake system with the addition of graphene. Graphene was chosen, because it is a material with incredible mechanical and thermal properties. In my case two solid lubricants, talc and graphite, were replaced with graphene. We discovered that the replacement of talc with graphene proved to be beneficial. The composite coefficient of friction has increased for about 25%. While its wear remained comparable with the sample that contained no graphene. On the other hand, replacing graphite with graphene did not bring any positive changes. Furthermore, the replacement destabilised coefficient of friction and increased the wear, while the coefficient of friction stayed comparable with the sample that contained no graphene.

Keywords:brake system, brake pads, graphene, coefficient of friction

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