Effect of oil and oil with graphite on tribological properties of glass filled PTFE polymer composites

Abstract

Present work deals with the experimental investigation of tribological properties of GF-filled polymer composites considering three velocities, i.e. 0⋅5, 1 and 2⋅0 m/s and loads ranging from 15⋅7 N to 45⋅13 N keeping rest of the parameters constant. The test has been carried out for three materials, PTFE + 15% GF, PTFE + 25% GF and PTFE + 35% GF in wet (oil) and adding additive as graphite (5% wt) in oil. SAE 20W40 oil is used for the test. Friction and wear tests of PTFE composite against a counter surface of EN8 with surface finish of 0⋅56 μm are carried out at ambient conditions using pin-on-disc tribometre (TR-20), Ducom make, Bangalore. The results are tabulated and graphs are plotted. It has been found that load and wet conditions have significant effect on coefficient of friction and specific wear rate of the materials. Where as sliding velocity also plays little role in wear mechanism of the material. It is concluded from the experimental study that the specific wear rate in wet condition as well as by adding additives in lubricating oil with 5% (by wt.) has been declined. Also the specific wear rate decreases with normal load and sliding velocity. Wear of PTFE + GF composite decreases with increase in glass percentage. Microscopic analysis of pin and disc surface is made with optical microscope. The mathematical models has been developed by using regression analysis and found to be valid for the above tested parameters.

Nanoceramic and Polytetrafluoroethylene Polymer Composites for Mechanical Seal Application at Low Temperature

“…These two distinctive peaks indicated that crosslinked structures were formed owing to tribochemical reactions during the wear of PTFE/NC composites. [20][21][22]24 These results showed that the adding of relatively small amounts (~2 wt %) of NC particles significantly changed the intensity of tribochemical processes and resulted in significant reduction of wear. Table 1 summarized the mechanical and tribomechanical characteristics of the neat PTFE and composites.…”

Tribological Behavior of Polytetrafluoroethylene and Its Composites Using the Taguchi Method

“…Glass fiber and Bronze can also be used as a filler material in PTFE which also may lead to improvement in wear resistance [13]. Addition of glass fiber in PTFE under wet condition, also improves the wear performance of PTFE material under different varying condition like load, velocity and sliding distance [14].…”

The Effect of Lubrication on Tribological Properties of Bearing Materials Using Pin on Disc: A Review

“…PTFE increases with glass fiber fillers and composites have good friction and wear behavior at higher speeds, so it can be more effectively used for high speed applications. Also the wear of the PTFE composites can be decreased by using oil and oil with graphite lubrication [11]. Shanta, et.al (2011) conducted their experiments on mixtures of SAE 15W40 oil, which were contaminated by known percentages of the bio diesels from canola oil, peanut oil, soybean oil, The friction behavior and where property were studied by means of pin-on -disc tribometer test were carried under wet conditions (Hydrodynamic lubrication) where the pin is AISI 316 stainless steel and the disc is AISI 1018 with a mixture of oils.…”