Write characteristics of a ideal lubricants and its industrial applications
Answers
Answered by
0
The characteristics of lubricants:
The main properties of lubricants, which are usually indicated in the technical characteristics of the product, are:
Viscosity
Viscosity index
Pour point
Flash point
Viscosity
Viscosity describes the flow behaviour of a fluid. The viscosity of lubricating oils diminishes as temperature rises and consequently is measured at a given temperature (e.g. 40°C).
Viscosity index
The viscosity index is a characteristic used to indicate variations in the viscosity of lubricating oils with changes in temperature.
The higher the level of the viscosity index, the lower the variation in viscosity at temperature changes.
Consequently, if two lubricants with the same viscosity are considered at a temperature of 40 °C, the one with the higher viscosity index will guarantee:
better engine start up at low temperatures (lower internal friction)
a higher stability of the lubricating film at high temperatures
Viscosimetric classifications
There are a number of viscosimetric classification systems that indicate, usually with a number, a more or less limited viscosity range.
Pour Point
The pour point refers to the minimum temperature at which a lubricant continues to flow.
Flash point
The flash point is the minimum temperature at which an oil-vapour-air-mixture becomes inflammable.
Applications of Lubricants
Lubricants are primarily used to reduce friction stress between surfaces. They have the following uses:
As antiwear, antioxidants, and antifoaming agents.
As demulsifying and emulsifying agents.
As rust and corrosion inhibitors.
In machinery as engine oils, compressor oils, gear oils, and piston oils.
As hydraulic, brake, and gear box fluids.
Used in the soap and paint industries.
The main properties of lubricants, which are usually indicated in the technical characteristics of the product, are:
Viscosity
Viscosity index
Pour point
Flash point
Viscosity
Viscosity describes the flow behaviour of a fluid. The viscosity of lubricating oils diminishes as temperature rises and consequently is measured at a given temperature (e.g. 40°C).
Viscosity index
The viscosity index is a characteristic used to indicate variations in the viscosity of lubricating oils with changes in temperature.
The higher the level of the viscosity index, the lower the variation in viscosity at temperature changes.
Consequently, if two lubricants with the same viscosity are considered at a temperature of 40 °C, the one with the higher viscosity index will guarantee:
better engine start up at low temperatures (lower internal friction)
a higher stability of the lubricating film at high temperatures
Viscosimetric classifications
There are a number of viscosimetric classification systems that indicate, usually with a number, a more or less limited viscosity range.
Pour Point
The pour point refers to the minimum temperature at which a lubricant continues to flow.
Flash point
The flash point is the minimum temperature at which an oil-vapour-air-mixture becomes inflammable.
Applications of Lubricants
Lubricants are primarily used to reduce friction stress between surfaces. They have the following uses:
As antiwear, antioxidants, and antifoaming agents.
As demulsifying and emulsifying agents.
As rust and corrosion inhibitors.
In machinery as engine oils, compressor oils, gear oils, and piston oils.
As hydraulic, brake, and gear box fluids.
Used in the soap and paint industries.
Similar questions