Lubricants

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Reduce friction

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Lubricants

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Prevention of metal to metal contact

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Lubrication

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2 flat surface in motion

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Sliding friction

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At least one moving surface is sperical

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Rolling friction

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Lubricants are compose of

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90% base oil 10%. Additives

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Additives used in lubricants

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Anti oxidant

Corrosion inhibitor

Anti wear agents

Foam inhibitors

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Measures viscosity index

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Saybolt viscometer

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Low viscosity index

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Naphthalenic base

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High viscosity index

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Paraffinic

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Characteristics of a good lubricants

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High boiling point

Adequate viscosity

Low freezing point

High oxidation resist

Non corrosive properties

Good thermal stability

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Classification of lubricants

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Liquid lubricants

Semi solid lubricants

Synthetic lubricants

Solid lubricants

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Also called hydrodynamic lubrication

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Thick film

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Lubricants used in thick film

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Hydrocarbon oils

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Also called boundary lubrication

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Thin film lubrication

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It's a measure of a fluid resistance to flow

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Viscosity

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The ability of the oil to stick firmly to a solid surface

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Tackiness or oiliness

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Property of water to get mixed with water easily

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Emulsion number

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Min. Temp. At which lubricants vaporizes that ignite for a moment when tiny flames is brought near.

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Flash point

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Min. Temp. At which lubricants vapours burns constantly for 5 seconds when tiny flames is brought near.

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Fire point

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Is the temp.at which Grease passes from semi solid to liquid state

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Drop point

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Is the temp. At which lubricants becomes cloudy or hazy when cooled

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Cloud point

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Is the temp. At which lubricants just ceases to flow when it is cooled.

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Pour point