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ADVANCED COMPOSITE
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Introduction
Carbon fiber-reinforced
carbon also known as
CFRC composite
Commonly used in
aerospace equipment
Very expensiveCRFC plate
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General Properties
High strength
Low density
Low coefficient of
thermal expansion
High modulus of
elasticityCRFC plate
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General Properties
Extreme heat resistance (2000C)
Relatively high thermal conductivity
Not prone to thermal shock
Major drawback low oxidation resistance
above 482C which can be countered thru
protection coatings
Like all composite materials, CFRC composites
tend to be anisotropic
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General Properties*Property Value (perpendicular) Value (parallel)
Density (kg/m^3) 1.49 x 10^3 1.49 x 10^3
Flexural strength (MPa) 170 -
Compressive strength (MPa) - 134
Tensile strength (MPa) - 133
Elastic modulus (GPa) - 100
Flexural elastic modulus (GPa) 63 -
Thermal conductivity (W/m*K) 7 32
Thermal expansion, 20-1000C(1\C)
7 x 10^-6 0.5 x 10^-6
Electric resistivity, 25C (Ohm*m) - 34 x 10^-6
* Properties of bi-directional fibers (cloth) CFRC composites
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Structure*
Matrix - Carbon (graphite)
Reinforcement - Carbon fiber
*FTW! @_@
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The 3 Types
Depends on the orientation of the
reinforcement (carbon fiber)
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The 3 Types
Unidirectional - one direction of carbon fiber
reinforcement, highly anisotropic
Bi-directional - two directions of carbon fiber
reinforcement (carbon fiber cloth)
Multi-directional many directions of carbon
fiber reinforcement, mechanical properties are
enhanced in the direction of fibers
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Fabrication
Liquid Phase Infiltration
Chemical Vapor Deposition
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Liquid Phase Infiltration
Preparation of carbon fiber into desired shape
Infiltration of preform with liquid precursor
Pyrolysis/carbonization
Graphitization
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Infiltration
The interaction between the molten matrix and the
fibers
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Pyrolysis/Carbonization
Chemical decomposition by heat w/o Oxygen
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Graphitization
Conversion of amorphous carbon into graphite
Increases elastic modulus and strength
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Chemical Vapor Deposition (CVD)
Preparation of carbon fiber into desired shape
Densification by CVD
Pyrolysis/carbonization
Graphitization
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Chemical Vapor Deposition (CVD)
Infiltration of preform with hydrocarbon gas
i.e. propane, methane, propylene
@ 2773 K
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Applications
Space Shuttle parts
High performance braking system
Components for nuclear applications
Hot-pressed dies
Heating elements
Turbojet engine
SGL Group cash cow :D
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Space Shuttle parts
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Airplane break discs
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Hot-pressed dies
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Heating Elements
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Turbojet engine
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CCarbon is Future