Lubricants and Greases. Shibu G. Pillai

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1 Lubricants and Greases Shibu G. Pillai

2 Contents Introduction Functions of lubricants Mechanism of lubrication Classification of lubricants Properties of lubricants Selection of lubricants

3 Classification of Lubricants Solid lubricants (graphite, MoS 2 ) Semi-Solid Lubricants (greases, vaselines) Liquid Lubricants (all oils) Animal and Vegetable oils Mineral oils Blended Oils SYNTHETIC Oils Cutting Fluids (O/W and W/O Emulsions)

4 Solid lubricants are used at high temperature and heavy load where a liquid or a semi-solid lubricant film cannot be maintained contamination of oil is unacceptable where combustible lubricants must be avoided Graphite and Molybdenum Disulphide Oil dag (suspension of graphite in oil) Aqua dag (suspension of graphite in water)

5 CHARACTERISTICS: 1. Soapy to touch. 2. Inflammable. 3. Doesn t oxidizes under 375 C. 4. Dispersion in oil is called oildag. Dispersion in water is called aquadag. USES: 1. As lubricants in air-compressors, lathes, foodstuffs industry, open gears, chains, railway track-joints etc. 2. Graphite mixed with grease (graphite-grease) is used at higher temperatures. 3. Oildag is used in internal combustion engines & Aquadag is used in foodstuffs industries.

6 Semi-Solid lubricants are used machinery parts are subjected to slow speed Heavy load and produce high temperature Spilling of the oil is undesirable Greases and Vaselines are most important

7 Grease Semi-solid lubricant obtained by thickening of a lubricating oil by the addition of metallic soap The properties of grease depend upon the the nature and mount of thickener used the characteristics of the base oil used the way in which the grease is prepared Most of the common grease are made with soap thickener (3% - 50%) Non-soap thickeners: carbon black, asphalten

8 Important functions of a SOAP in a grease it act as a thickener it enables the grease to stick to the metal surface the nature of the soap determines the temperature up to which grease can be used and its consistency

9 Ca-Based Grease/Cup-Greases Emulsion of petroleum oil with calcium soap. 1. Insoluble in water 2. They are the cheapest 3. They can even be used at low temperatures because above 80 C, soap starts to separate USES: They are used in tractors, water pumps, etc. Na-Based 1. They are not water resistant. 2. They can be used upto 175 C USES: They are used in ball bearings.

10 Li-Based They are petroleum oils thickened by mixing lithium soap 1. Water Resistant 2. Expensive 3. Thermally stable USES: In Aircraft Applications. Axle Grease They are cheap resin greases prepared by adding lime to resin & fatty oils. They are water-resistant. USES: They are used in the equipment which work under high load & low speed

11 Liquid lubricants Mostly used Used in delicate & light machines which works at high speed but under low pressure Animal and vegetable oil Mineral oil Blended oil Synthetic oil

12 Animal and Vegetable Oil Extracted directly from nature They are very costly They can undergo oxidation very easily They are used where there is heavy load They are triglycerides of higher fatty acids Possess Good Oiliness Property Examples : Olive Oil, Sunflower Oil, Coconut Oil, Castor oil, Cod-liver oil

13 Mineral/petroleum Oil Obtained by distillation of petroleum These are basically lower molecular weight hydrocarbons with C atoms Shorter chain have lower viscosity Most widely used Cheap, available in abundance and quite stable under any conditions Possess Poor Oiliness Property Oiliness can be improved by adding high molecular weight compunds like oleic acid, stearic acid or triglycerides of higher fatty acids

14 Blended Oil Additives are added to the lubricating oils in order to further improve their properties of the refined lubricating oils. They are added in amounts upto 10%.

15 Cutting Fluid/Oil/Emulsion In various machining operations such as drilling, cutting, threading, turning the friction is very high and this generates large amount of heat Due to overheating, the tool may lose its temper and hardness In order to prevent this, efficient lubrication and cooling have to be provided This is done by employing cutting oils or fluids or cutting emulsion

16 In order to provide satisfactory service, the cutting fluid should possess following characteristics: good lubricating properties low viscosity, so that lubricant can easily fill in the cracks formed on the work-piece chemical stability non-corrosive nature high thermal conductivity

17 Properties of Lubricants FOR OILS Viscosity and Viscosity Index Cloud and Pour-Point Flash and Fire-Point Aniline Point Oiliness Saponification number Steam Emulsion Number (SEN) Carbon Residue

18 FOR GREASE Penetration Index Drop Point

19 Viscosity & Viscosity Index Property of a liquid by virtue of which it oppose relative motion between its different layers is known as viscosity or internal friction of liquid Measure of internal resistance to flow Thickness of fluid (in laymen terms) Important in lubricant selection Two Types: Kinematic Viscosity Absolute Viscosity

20 Viscosity-Temperature Relation viscosity of liquids decreases with increasing temperature consequently, the lubricating oil becomes thinner as the operating temperature increases Hence, viscosity of a good lubricating oil should not change much with change in temperature

21 Viscosity Index The rate at which the viscosity of an oil changes with temperature is measured by an arbitrary scale If the viscosity of an oil falls rapidly as the temperature is raised, it has low viscosity index If the viscosity of an oil slightly affected on rising the temperature, it has high viscosity index For a good lubricating oil viscosity-index should be HIGH

22 Determination of Viscosity Index Two types of standard oils, Paraffinic-base Pennsylvanian oils (VI =100) and Naphthanicbase Gulf oils (VI =0) are used Against each of these is marked their viscosities at 100 F and 210 F Former are known as H-oils and latter as L-oils Following steps involved:

23 The viscosities of the oil under test at 100 F and also at 210 F are first found out, let these values be U and V respectively. The difference between the two values should be low, if the oil is good. Now from the list of H-oils (VI =100), the oil which as the same viscosity at 210 F as the oil under-test is selected, and its corresponding viscosity at 100 F is determine: say H Then, from the list of L-oils (VI = 0), the oil which as same viscosity at 100 F is determine: say L

24 VI = L U L H 100 U: viscosity at 100 F of the test oil (sample) L: viscosity at 100 F of the low-viscosity standard oil H: viscosity at 100 F of the high-viscosity standard oil

25 Viscosity-Temperature Graph

26 Cloud and Pour Point When an oil is cooled slowly, the temperature at which it becomes cloudy or hazy in appearance, is called its CLOUD POINT While the temperature at which the oil ceases to flow or pour, is called its POUR POINT Good lubricant should have low pour point. Polyalkylbenzene, is a pour point depressant

27 It gives the suitability of lubricants in cold environments The presence of waxes in the lubricating oil increases the pour point. Pour point determiners the suitability of a lubricant oil for low temperature.

28 Flash and Fire Point The minimum temperature at which the oil gives off sufficient vapours to ignite for a moment (flash), when a flame is brought near the surface of the oil, called its FLASH POINT The lowest at which the vapours of the oil burn continuously for atleast 5 seconds, called its FIRE POINT Good lubricant should have higher flash point w.r.t working temperature

29 Aniline Point gives an indication of the possible tendency of deterioration of an oil when it comes into contact with packing, rubber sealing etc. Aromatic hydrocarbon have a tendency to dissolve rubber defined as the minimum equilibrium solution temperature for equal volumes of aniline and oil sample Should be HIGH

30 Determination of Aniline Point Mixing equal volumes of aniline and the oil sample in a tube Heating the mixture until a homogeneous solution is obtained Allowed to cool at a specific rate, until the two phases (oil & aniline) separate out Temperature corresponding to observation is reported as ANILINE POINT

31 Saponification Number The number of milligram of KOH require to neutralize the fatty acids resulting from the complete hydrolysis of 1g of fat Unitless To indicate the presence of fatty materials in oil

32 Steam Emulsion Number (SEN) It is number of second require to demulsified Lubricant Unit: seconds For good lubricant it should be less To indicates the formation of stable emulsion or not Good lubricating oils never form stable emulsion

33 Penetration Index/Consistency value Consistency of the grease Defined as the distance in tenth of mm that a standard cone penetrates vertically into the sample, under the condition of load, temp and time Instrument: Penetrometer

34 Drop Point Defined as the temperature at which grease passes from the semi-solid to the liquid state Upper limit temp for the applicability of the grease

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