Lubrication ppt.
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This presentation discusses lubricants, including their composition, properties, functions, and different types. Lubricants are substances that reduce friction between surfaces. They typically contain 90% base oil and less than 10% additives. Additives can improve properties like oxidation resistance. Lubrication reduces wear, friction, heat, noise, and corrosion. Different lubrication methods include oil cans, grease packing, and circulation systems. Lubricant types include solid, semi-solid, liquid, synthetic, animal, vegetable, and mineral oils. Properties like viscosity, stability, volatility, and thermal stability were also covered.
Lubrication ppt.
- 3. Name: Md. Zahirul Islam Roll:333 Batch:12th Department of pharmacy World University of Bangladesh
- 4. Lubricants Lubricants are those substances, which are Used to reduce the force of Friction between two sliding surfaces.
- 5. Lubrication Lubrication is the process, or technique employed to reduce wear on surfaces in close proximity, and moving relative to each another.
- 6. Composition of lubricants Typically contains 90% base oil(petroleum-mineral oils) and less than 10% additives Non liquid lubricants contains Grease, powder(dry graphite, Molibdenum disulphite), Teflon tape used in plumbing etc. Those non liquid lubricants provide lubrication at higher temp.(up to 350 °C)
- 7. Additives The properties of a lubricant can be improved by adding certain chemicals Anti oxidants Foam depressants Corrosion inhibitors Detergent Dispersers Oiliness improvers
- 8. Different Lubricating conditions Dry Lubrication- No lubricant present between the surfaces Boundary lubrication (Thin film) -This condition is found on machine slide ways (Lathe cross slide, milling machine table). No oil film Thin oil film
- 9. Objectives of Lubrication To reduce frictional resistance. To reduce wear on the bearing surfaces. To protect the bearing surfaces from corrosion. To carry away heat from the bearing. To reduce noise from the moving components of the machine.
- 10. Lubricating Methods Oil can Oil gun Grease packing Wick type Bath type (Splash) Circulation (pressure)
- 11. Types of Lubricant Animal oils - From animal fats Vegetable oils - From plant seeds Mineral oils - Hydrocarbons obtained from minerals Synthetic oils - From various chemicals Grease - Semi-fluid lubricant Dry - Molybdenum disulphide, Graphite
- 12. Types of Lubricants Solid lubricants e.g Wax, Talc, Mica, Molibdenum disulphide Semi solid lubricants e.g. Grease and Vaseline Liquid Lubricants e.g. Mineral oils, Vegetable oils, Animal oils Synthetic lubricants e.g. Polyglycols, Silicones, Organic amines, Imines, Amides.
- 13. Properties of Lubricant Viscosity - Resistance of a liquid to flow. Oiliness- Ability of the lubricant to stay in place between the bearing surfaces. Stability –Retention of properties as long as possible (Oxidization, Biological degradation, Dilution)
- 14. Properties of Lubricant Volatility o It shows the evaporation behavior of lubricant at high temperature. o A good lubricant should have low volatility Emulsification o It is the property of a lubricant due to which the lubricating oil mixed with water to form an emulsion. o A good lubricant should have low emulsion number.
- 15. Properties of Lubricant Corrosion Stability It is properties of lubricant which represents its resistance toward the metals. A good lubricant should not take part in corrosion. Thermal Stability A good lubricant must be stable towards heat. It should not decompose during operation at high temperature.
- 16. Functions of Lubricants Keep moving parts apart Reduce friction Transfer heat Carry away contaminants & debris Transmit power Protect against wear Prevent corrosion
- 17. Thanks To All
- 18. Thanks To all