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24. Jun 2020 | Coatings Technologies

Tribological properties of polyimide-graphene composite coatings at elevated temperatures

A new paper focuses on developing a polyamic acid (PAA) of polyimide (PI) and PI filled with graphene (PI/GP) on 100CR6 ESU hardened steel.

A laboratory scene as symbolic image.

The 3 wt % of GP content in the PI is the optimum loading for the lowest friction and wear at RT and elevated temperatures. Image source: totojang1977 – stock.adobe.com (symbol image).

The tribological testing result of the pure PI and PI/GP against 100Cr6 steel ball at room temperature (RT) and elevated temperatures (50 °C, 100 °C, 150 °C, 200 °C) exhibits that the addition of GP clearly enhances the friction reduction and wear-resistant properties of PI, due to the excellent lubricating properties of GP.

The 3 wt % of GP content in the PI is the optimum loading for the lowest friction and wear at RT and elevated temperatures.

High wear-resistance of the PI/GP composite

The SEM analysis of the worn surfaces showed that the high wear-resistant of the PI/GP composite is due to the generation of the loose particles from the coating surfaces which could be embedded on the friction pairs and rolled over there as a lubrication film.

The study has been published in Progress in Organic Coatings, Volume 142, May 2020.

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