A study on the effect of molybdenum disulfide additive on tribological performance of MNR grease

Putit, Mohd Farriszakwan (2021) A study on the effect of molybdenum disulfide additive on tribological performance of MNR grease. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

In this study, the tribological perfonnance of grease with molybdenum disulfide additive (MoS2) is investigated by using 4-ball tester. Greases were supplied by MNR Company. The experiment was conducted by using an ASTM D2266 standard. The result of friction and wear were compared between grease with MoS2 additive and grease without additive. Results showed MoS2 additive could reduce the friction, wear and surface roughness of the contacted steel balls. MNR with Molybdenum disulphide has gave lowest coefficient of friction and the average wear scar diameter (mm) with value of 0.038 and 0.34 while compared to MNR without Molybdenum disulfide has value of 0.082 and 0.57. From the graph, it showed percentage difference for the coefficient of frictions with 53.66%. For the average wear scar diameter (mm) has 40.35% percentage difference slightly small compared to coefficient of frictioi:i percentage difference. For the surface roughness of MNR grease it gives 54.02%. The result obtained is caused by the extreme pressure additive's molybdenum properties that exhibit wear.It also caused by Molybdenum disulphide that contains pa1ticle sharp edges that act as an abrasive agent. From the chemistry study, the fonn ation of tribofilms on the worn surface is supported by inadequate pressures to withstand the Van der Waals forces.

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