Tribology is derived from the Greek word “Tribos”. Meaning Rubbing. Tribology is a science that deals with friction, lubrication and wear in all contacting pairs. Tribological knowledge helps to improve service life, safety and reliability of interacting machine components; and yields substantial economic benefits. It is known that oils and greases reduce the friction between sliding surfaces, by filling the surface cavities and making the surfaces smoother. Action of liquids/greases known as lubrication. In other words, lubrication is a process by which the friction and wear rates in a moving contact are reduced by using suitable lubricant. Lubricant is a substance introduced between relatively moving parts to reduce friction and wear rate.

1. TRIBOLOGY
Copyright
© Avin Ganapathi
1

2. TRIBO
+
LOGY
=
TRIBOLOGY
 TRIBO= RUBBING
 LOGY= TO STUDY
© Avin Ganapathi 2

3. TRIBOLOGY
FRICTION
WEARLUBRICATION
Fig1: Components of TRIBOLOGY
© Avin Ganapathi 3

4. FRICTION MOTION
FRICTION
Fig2 Friction
© Avin Ganapathi 4

5. Fig3 Rolling friction© Avin Ganapathi 5

6. Leonardo da Vinci
Fig 4 Friction experiment
© Avin Ganapathi 6

7. STATIC DYNAMIC
ROLLING FLUID
FRICTION
Fig 5 Types of friction
© Avin Ganapathi 7

8. Fig 6 Dynamic friction© Avin Ganapathi 8

9. WEAR
Fig7 Causes of wear
© Avin Ganapathi 9

10. LUBRICATION
© Avin Ganapathi 10

11. LUBRICANT
COOL
CLEAN
LUBRICATE
TRANSMIT
POWER
SEAL
Fig8 Functions of Lubricant
© Avin Ganapathi 11

12. LUBRICANT
SOLID
WAX,TALC
SEMI-SOLID
GREASE,VASELINE
LIQUID
MINERAL OILS,VEGETABLE
OILS,ANIMAL OILS
TYPES
Fig9 Types of Lubricant
© Avin Ganapathi 12

13. Thermal
stability
Chemical
stability
Compatibility Heat capacity
Thermal
conductivity
Corrosiveness Flammability
Toxicity
Resistance to
Foam
Fig 10 Properties of Lubricant
© Avin Ganapathi 13

14. TRIBO
ANALYSIS
Ferrography
Particle
counter
Spectroscopic
Analysis
Rotary Particle
Depositor
Fig11 Tests for used Oil
© Avin Ganapathi 14

15.  Automotive industry
 Cement industry
 Chemical industry
 Food industry
 Glass industry
 Marine industry
 Metalworking
 Mining industry
 Oil & gas industry
 Pharmaceutical industry
 Railways
 Rubber and plastics industry
 Steel industry
 Paper industry
 Textile industry
 Wind power industry
 Wood industry
© Avin Ganapathi
APPLICATIONS
15

16. © Avin Ganapathi 16