Analysis Of Grease Degradation Under Elastohydrodynamic Lubricant
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Date
2022-07-24
Authors
Abdul Mutalib, Nurul Rafika Amira
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The performance of grease is important as it may influence the friction and wear of the
lubricated components. The purpose of this study is to investigate the performance and degradation
of the grease in rolling contact applications. In this study, four types of grease has been studied,
there are palm oil with Cu nanoparticle grease, palm oil with MoS2 micro particle, SKF LGGB
2/0.4 mineral Grease and BIOGREASE Food Grade Grease Marlin-9. ASTM D2266 Standard
were used to study the wear preventive characteristic of the lubricating grease. The grease
performance at high temperature and load with the value of 100℃ and 100kg are also evaluated.
DUCOM Four-Ball Tester Machine, Hitachi TM1000-Tabletop Microscope machine, Hitachi S 3400N SEM, Alicona IFM-Optical 3D surface metrology and Thermogravimetric Analyzer Pyris
1 (Perkin Elmer) were used in this study to analyse the grease performance and degradation. The
finiding shown that the performance of the palm oil grease with additive is comparable to the
commercial mineral grease. At high temperature and load test, the palm oil with Cu and MoS2
additive show low and stable COF values, and this indicates that no degradation occurs to the
grease when operating at high temperature and load. These grease also show the best performance
at high load application with a small roughness and wear depth profile. LGGB has the best
tribology perfomance in all aspect and this is undeniably because it a commercial grease that has
been used all over the world. Food Grade has the worst performance because this type of grease is
widely used in the food line operation. To prevent harm to human, the formulation ingredients
must be safe to human but at the same time can protect the machine.