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Muffakham Jah College Of Engineering

And Technology

MECHANICAL ENGINEERING DEPARTMENT

GENERAL SEMINAR BY:

NAME : MOHAMMAD ABDUL ASHWAQ

ROLL NO. : 1604-09-736-141

TOPIC : CARBON FIBRE

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INTRODUCTION:Carbon Fibre is one of the most recent

developments in the field of composite

materials and is one of the strongest fibers

known to man.Carbon fibre was originally developed in

space technology, but has now been adopted

in many other areas of manufacture.

This material is known for its high specific

stiffness and strength. The material has an

advantageous combination of good

mechanical properties and low weight.

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In 1958, Roger Bacon created high-

performance carbon fibers at the Union

Carbide Parma Technical Center, now

GrafTech International Holdings, Inc.,

located outside of Cleveland,Ohio.During the 1970s, experimental work to find

alternative raw materials led to the

introduction of carbon fibers made from a

petroleum pitch derived from oil processing.These fibers contained about 85% carbon

and had excellent flexural strength.

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Properties of carbon fibre are:

high tensile strength.

low thermal expansion.

Resistance to corrosion and fire.

High stress tolerance levels.

electrically and thermally conductive.

Chemical inertness. light weight and low density.

very hard and brittle.

High abrasion and wear resistance.

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Carbon fibres are long bundles of linked

graphite plates, forming a crystal structure

layered parallel to the fiber axis. This crystal

structure makes the fibers highly anisotropic,with an elastic modulus of up to 5000GPa.

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Fibres can be made from several different

precursor materials, and the method ofproduction is essentially the same for each

precursor: a polymer fibre undergoes pyrolysis

under well-controlled heat, timing and

atmospheric conditions, and at some point inthe process it is subjected to tension. The

resulting fiber can have a wide range of

properties, based on the orientation, spacing,

and size of the graphite chains produced byvarying these process conditions.

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VacuumInfusion

Resininjection.

Pultrusion

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Carbon fibres are cutting edges in:

Aerospace and aircraft industry.

Sports equipment.

Automotive parts.Small consumer goods like laptops,

watches etc.

Air filtration.

Fishing rods and tripods.Acoustics.

As a microelectrode in extracellularrecording in medicine.

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MANUFACTURERS :

Hexcel.

SGL Carbon.

Toho Tenax.Toray Industries.

Zoltek.

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Very low weight.

High impact tolerance.

Insensitive to climate and temperature changes.

Reduced maintenance costs.

Long service life.

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It is very expensive.

The chief drawback of carbon fibre composites

is that they oxidize readily at temperaturesbetween 600-700C, especially in the presence

of atomic oxygen.

The high electrical conductivity of airborne

graphite particles creates an unhealthyenvironment for electrical equipment near

machining areas.

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www.howstuffworks .com

Wikipedia.

www.fadooengineers.com

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