This presentation gives an idea of how the presence of nano particles affect the functionality and performance of lubrication.

1. Presented by
SUBRAT KUMAR MAHARANA
M.E. IN MECHANICAL ENGINEERING
JADAVPUR UNIVERSITY,KOLKATA

2. CONTENTS
 Introduction
 Effects of chemical composition of nanoparticles on
lubricating performance
 Effect of particle size
 Effect of morphology of nanoparticles
 Conclusion

3. WHAT IS A NANO PARTICLE??
Nanoparticles are particles between 1 and
100 nanometres (nm) in size

4. BASIC COMPOSITION OF AN OIL LUBRICANT
LUBRICANTS
HYDROCARBONS(90%) ADDITIVES(10%)
ORGANIC
NANOPARTICLES
ADDITIVES GOVERN THE BEHAVIOUR OF THE
LUBRICANT

5. LUBRICATION MECHANISM OF
NANOPARTICLES
 ROLLING OF NANOSPHERES---CONTROL FRICTION
 TRIBOFILM FORMATION AS RESULTS OF
TRIBOCHEMICAL REACTIONS-CONTROLS WEAR
 MENDING EFFECT OF THE MINIMAL SIZE-WEAR
 POLISHING

6. WHY NANOPARTICLES IN A LUBRICANT??
STUDIES SHOWS....
 Thermally More Stable At Elevated Temperatures
 Potential In Emission Reduction
 Improved Fuel Efficiency and engine performance
and many more....

7. Aspect of study and analysis of
results
 MINIMUM FRICTION COEFFICENT(MFC)
 MAXIMUM FRICTION REDUCTION(MFR)
 MAXIMUM WEAR REDUCTION(MWR)

8.  Carbon & its derivatives:
graphene,diamond
 Metals :Sn,Fe,Bi etc.
 Metal oxides: ZrO2, TiO2
etc.
 Sulphides :Ws2,CuS etc.
 Rare earth compounds
LaF3,CeO2
Effects of chemical composition

9. EFFECT OF SULPHIDES ON LUBRICATING
PERFORMANCE(MoS2)
Heat(friction & contact pressure)
Tribochemical reactions
Formation of tribofilms
Controls wear.
Limitation
Sulphide is an environmental
hazard

10. EFFECT OF NANOCOMPOSITES
 Due to the synergetic effects of more than one type of
nanoparticles, composites usually show superior performance
than the individual.
 Nanoparticles are inherently not miscible in oil.
 The surface properties of nanoparticles alter from hydrophilic to
lipophilic, that is favorable for tribological performance.

11. EFFECT OF METALS
LUBRICATION MECHANISM OF METALS
 ROLLING ACTION(DUE TO NANOPARTICLES)
BETWEEN SUFACES DECREASES FRICTION AND
WEAR.
 REPAIRING EFFECT OR SINTERING EFFECT:
NANOPARTICLES GETS COMPACTED ON WEAR
TRACK DUE TO HEAT GENERATION eg: copper

12. EFFECT OF RARE EARTH COMPOUNDS
 Can be directly used as additives or can be doped into
other nanoparticles such as TiO2
 Mechanism of operation: almost same as metals--
tribofilm formation adsorption film.

13. EFFECT OF CHEMICAL COMPOSITION:RESULTS

14. EFFECT OF PARTICLE SIZE(CaCO3)
 Small size permits them to pierce into the contacting
surfaces
 High surface volume ratio enables to interact with
surrounding

15. EFFECT OF SIZE:RESULTS

16. EFFECT OF MORPHOLOGY
 GRANULAR , ONION(LAMELLAR)
SHEET,SPHERICAL,TUBE
ONION MORPHOLOGY
 ABSENCE OF DANGLING BONDS
 3 FOLD ACTION
1. SLIDING
2. ROLLING ACTION
3. EXFOLIATION- MULTILAYER MECHANISM
REDUCES FRICTION AND WEAR

17. 3 FOLD ACTION

18. RESULT ANALYSIS

19. CONCLUSION
Effects of nanoparticles due to:-
Chemical Composition- major effect on Anti-wear
performance & negligible on Friction performance.
Particle Size- visible effects on both Anti-wear as well
as Friction performances.
Morphology- critical role on Friction performance
and subtle effect on Anti-wear performance.

20. THANK YOU