Explanation: Both carbon allotropes feature strong C−C bonds. Diamond features these bonds in 3 dimensions. … The individual layers are held together by weak bonds, allowing the layers to slide over each other and provide lubrication.
Can we use diamond as a lubricant?
Diamond, on the other hand, is a very hard substance and so cannot be used as a lubricant. Graphite and diamond both have strong C−C. These bonds are seen in three dimensions in diamond.
Why can graphite be used as a lubricant but not diamond?
Because of its softness and non-volatile nature, graphite is used as a lubricant in the fast moving parts of a machinery. … Diamond, on the other hand, is an extremely hard substance; therefore, it cannot be used as a lubricant.
Why graphite can be used as lubricants?
The carbon atoms are strongly bonded together in sheets. Because the bonds between the sheets are weak, graphite shows lower shearing strength under friction force. Thus it can be used as a solid lubricant and has become one of traditional and primary solid lubrication materials.
Is used as a lubricant?
The correct answer is Graphite. Graphite is used as a lubricant because of its slippery nature.
Why diamond is used as an abrasive?
Diamond is used as an abrasiveIn diamond carbon is sp3 hybridized. … It is very difficult to break this extended covalent bonding and for this reason diamond is the hardest substance known. Thus it is used as an abrasive and for cutting tools.
Are diamond and graphite abrasive?
Yet diamond is the hardest mineral known to man (10 on the Mohs scale), and graphite is one of the softest (less than 1 on the Mohs scale). As a result, diamond is the ultimate abrasive, whereas graphite is an excellent lubricant. Diamond is an electrical insulator while graphite is a good conductor of electricity.
Why diamond has a high melting point?
Each carbon atom is covalently bonded to four other carbon atoms. … Because covalent bonds are strong, diamond contains many covalent bonds. As high temperatures are required to break such strong bonds, diamond melts at a very high temperature.
Which of the allotropes of carbon can be used as lubricants?
Graphite powder is used as a dry lubricant.
What is the function of lubricants?
A lubricant is a substance that helps to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move. It may also have the function of transmitting forces, transporting foreign particles, or heating or cooling the surfaces.
Is sand a lubricant?
Answer: Sand is not a lubricant.
What is graphite lubricant made of?
Graphite is structurally composed of planes of polycyclic carbon atoms that are hexagonal in orientation. The distance of carbon atoms between planes is longer and, therefore, the bonding is weaker. Graphite is best suited for lubrication in air. Water vapor is a necessary component for graphite lubrication.
Is silica used as a lubricant?
Fume silica provides gellants that form greases having dropping points about 260°C. Due to lack of phase changes of such gellants, they form lubricants with lower torque than those containing soaps when subjected to low temperature.
Which of the following is a good lubricant?
Graphite is best suited for lubrication in air. It is a mineral made of loosely bonded sheets of carbon atoms, giving it a slippery texture that makes it a very effective lubricant.
What type of oil is suitable for thick film lubrication?
Hydrocarbon oils are considered to be satisfactory lubrication for fluid film lubrication.
Which of the following is not the lubrication method?
Water is not a lubricant. 2.