Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
TRIBOLOGICAL PROPERTIES OF UNSATURATED POLYESTER REINFORCED WITH GRAPHITE
Submission Author:
Valquiria borges , PR , Brazil
Co-Authors:
João Henrique Stadiniski Hartmann, Carlos Marcus Cruz, Carlos Henrique Silva, Valquiria borges
Presenter: Valquiria borges
doi://10.26678/ABCM.COBEM2017.COB17-2823
Abstract
Polymer composites are materials that may combine mechanical and tribological characteristics that are not found in traditional engineering materials. In the present study, it was evaluated the tribological properties of an unsaturated polyester (UP) composite reinforced with graphite. For this purpose, unsaturated polyester matrix composite containing 0, 3, 7 and 15%wt of graphite were prepared by hand mixing. The tribological behavior of this composite was described under reciprocating dry sliding in a ball-on-plate contact against a tungsten carbide sphere. The friction and wear properties were studied as a function of normal load and frequency. Tests were performed with a combination of two loads and three velocities with a total sliding distance constant. Tribological test results show that the coefficient of friction (COF) decreases when adding graphite in unsaturated polyester. The presence of graphite decreases COF as a result of development of a tribofilm of graphite that lubricates the contact track. For this study the composite with 7% of graphite (UPG7%) presented the lowest COF values. However, for UPG15% there was a slight increase in friction compared to 7%wt of graphite indicating that higher concentrations of graphite might reduce mechanical resistance leading to higher wear track and COF.
Keywords
unsaturated polyester, Tribology, coefficient of friction, graphite
