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Effects of PTFE micro-particles on the fiber-matrix interface of polyoxymethylene/glass fiber/polytetrafluoroethylene composites

Kunnan Singh, J. S., Ching, Y. C., Liu, D. S., Ching, K. Y., Razali, S. and Gan, S. N. (2018) Effects of PTFE micro-particles on the fiber-matrix interface of polyoxymethylene/glass fiber/polytetrafluoroethylene composites. Materials, 11 (11). 2164. ISSN 1996-1944

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To link to this item DOI: 10.3390/ma11112164

Abstract/Summary

Reinforcing polyoxymethylene (POM) with glass fibers (GF) enhances its mechanical properties, but at the expense of tribological performance. Formation of a transfer film to facilitate tribo-contact is compromised due to the abrasiveness of GF. As a solid lubricant, for example, polytetrafluoroethylene (PTFE) significantly improves friction and wear resistance. The effects of chemically etched PTFE micro-particles on the fiber-matrix interface of POM/GF/PTFE composites have not been systematically characterized. The aim of this study is to investigate their tribological performance as a function of micro-PTFE blended by weight percentage. Samples were prepared by different compositions of PTFE (0, 1.7, 4.0, 9.5, 15.0 and 17.3 wt.%). The surface energy of PTFE micro-particles was increased by etching for 10 min using sodium naphthalene salt in tetrahydrofuran. Tribological performance was characterized through simultaneous acquisition of the coefficient of friction and wear loss on a reciprocating test rig in accordance to Procedure A of ASTM G133-95. Friction and wear resistance improved as the micro-PTFE weight ratio was increased. Morphology analysis of worn surfaces showed transfer film formation, encapsulating the abrasive GF. Energy dispersive X-ray spectroscopy (EDS) revealed increasing PTFE concentration from the GF surface interface region (0.5, 1.0, 1.5, 2.0, 2.5 µm).

Item Type:Article
Refereed:Yes
Divisions:University of Reading Malaysia
ID Code:102059
Publisher:MDPI

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