Effect of expanded graphite on mechanical and tribological properties of polyamide 6/glass fibre composites

Japić, Dajana (author), Kulovec, Simon (author), Kalin, Mitjan (author), Slapnik, Janez (author), Nardin, Blaž (author), Huskić, Miroslav (author)

The quality of plastic gears, especially their durability, is becoming increasingly important due to advances in electric mobility. Therefore, new materials are being developed that must have better mechanical properties, high thermal conductivity for heat dissipation, and tribological properties. The composites of expanded graphite (EG) and glass fibre-reinforced polyamide 6 (PA6/GF) were prepared, and the effect of EG particle size (~5 μm (EG5) and ~1000 μm (EG1000)) on these properties was investigated. Composites with different contents (2-10 wt%) of EG in PA6/GF were prepared using a laboratory twin-screw extruder and then injection moulded in the form of rods and discs required for thermal, thermomechanical, and tribological tests. EG acted as a nucleating agent but hindered the crystallization rate at higher concentrations, which was more pronounced when EG5 was added. Dynamic mechanical analysis showed that the storage modulus increased with the addition of both types of EG. However, the addition of EG5 increased the storage modulus more than EG1000. The lowest coefficient of friction was obtained by the addition of 10 wt% EG5. The wear increased with the addition of both types of EG, only slightly with the addition of EG1000. The thermal conductivity of the composites with EG increased from 0.42 W/mK to 1 W/mK. The results show that the use of EG with smaller particle size is much more beneficial than with a larger one.

• Language: English
• Keywords: graphite, polimerys, friction, wear
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Publication date: 12.02.2022
• Year: 2022
• Number of pages: 8 str.
• Numbering: Vol. 2022, art. 9974889
• PID: 20.500.12556/RUL-139399
• UDC: 539.92:678.7
• ISSN on article: 0730-6679
• DOI: 10.1155/2022/9974889
• COBISS.SI-ID: 97314051
• Publication date in RUL: 02.09.2022

Record is a part of a journal

• Title: Advances in polymer technology
• Shortened title: Adv. polym. technol.
• Publisher: Van Nostrand Reinhold
• ISSN: 0730-6679
• COBISS.SI-ID: 59444227

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 12.02.2022

Secondary language

• Language: Slovenian
• Keywords: grafit, polimeri, trenje, obraba

Projects

• Funder: Other - Other funder or multiple funders
• Funding programme: Republic of Slovenia and the European Union under the European Regional Development Fund
• Project number: C3330-18-952014
• Acronym: MAPgears

• Funder: ARRS - Slovenian Research Agency
• Project number: I0-0046
• Name: Infrastrukturni program Tehnologija polimerov