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Optimization of the Tribological Properties of Epoxy-PTFE-Glass Composites for Dry Sliding Bearings

Huls, R.J. (2015) Optimization of the Tribological Properties of Epoxy-PTFE-Glass Composites for Dry Sliding Bearings. Master's Thesis / Essay, Industrial Engineering and Management.

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In this work, optimization of tribological properties of PTFE and glass micro-sphere filled epoxy is explored. The effect on tribological performance, of incorporating a fourth component (TiC, CNT, Al2O3, Si3N4 nano-fillers or short carbon fibers) in Epoxy-SiO2-30 wt.%-PTFE-15 wt.% composites, is investigated. The developed SiO2-PTFE-Epoxy composites reinforced with randomly orientated short carbon fibers are unable to achieve stable CoF curves within 1000 m of sliding against 100Cr6 steel ball counterparts under a normal load of 60 N. Moreover, wear of both the CF composites and the corresponding counterparts is found to be more severe than that of plain Epoxy-SiO2-30-PTFE-15 composites. The CoF curves and values of 1 wt.% nano-reinforced TiC, Al2O3, Si3N4 and CNT composites are found to be fairly similar to that of plain Epoxy-SiO2-30-PTFE-15 composites after 14468 laps of sliding (1000 m or ~1136 m) under a normal load of 60 N (~104 MPa in steady state). Significant reductions in wear rates were realized for 1 wt.% nano-TiC and Si3N4 composites relative to plain Epoxy-SiO2-30-PTFE-15 composites (~29%→1.5×〖10〗^(-6) mm3/Nm and ~44%→1.18×〖10〗^(-6) mm3/Nm respectively), while resulting in minor abrasive wear of the 100Cr6 steel counterpart balls. Long distance tests performed on 1 and 3 wt.% nano-TiC composites under a normal load of 60 N showed that stable CoF values and curves are maintained until ~ 5000 m, indicating good load bearing capacity. A long distance tribo-test of 3 wt.% nano-TiC composite sliding 10000 m under a normal load of 50 N (~90 MPa in steady state) resulted in the low wear rate of 2.06×〖10〗^(-7) mm3/Nm.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Industrial Engineering and Management
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 08:09
Last Modified: 15 Feb 2018 08:09

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