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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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