Carbon Fiber Reinforced CFRC

8/2/2019 Carbon Fiber Reinforced CFRC

1/22

ADVANCED COMPOSITE


2/22

Introduction

Carbon fiber-reinforced

carbon also known as

CFRC composite

Commonly used in

aerospace equipment

Very expensiveCRFC plate


3/22

General Properties

High strength

Low density

Low coefficient of

thermal expansion

High modulus of

elasticityCRFC plate


4/22

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


5/22

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


6/22

Structure*

Matrix - Carbon (graphite)

Reinforcement - Carbon fiber

*FTW! @_@


7/22

The 3 Types

Depends on the orientation of the

reinforcement (carbon fiber)


8/22

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


9/22

Fabrication

Liquid Phase Infiltration

Chemical Vapor Deposition


10/22

Liquid Phase Infiltration

Preparation of carbon fiber into desired shape

Infiltration of preform with liquid precursor

Pyrolysis/carbonization

Graphitization


11/22

Infiltration

The interaction between the molten matrix and the

fibers


12/22

Pyrolysis/Carbonization

Chemical decomposition by heat w/o Oxygen


13/22

Graphitization

Conversion of amorphous carbon into graphite

Increases elastic modulus and strength


14/22

Chemical Vapor Deposition (CVD)

Preparation of carbon fiber into desired shape

Densification by CVD

Pyrolysis/carbonization

Graphitization


15/22

Chemical Vapor Deposition (CVD)

Infiltration of preform with hydrocarbon gas

i.e. propane, methane, propylene

@ 2773 K


16/22

Applications

Space Shuttle parts

High performance braking system

Components for nuclear applications

Hot-pressed dies

Heating elements

Turbojet engine

SGL Group cash cow :D


17/22

Space Shuttle parts


18/22

Airplane break discs


19/22

Hot-pressed dies


20/22

Heating Elements


21/22

Turbojet engine


22/22

CCarbon is Future

Carbon Fiber Reinforced CFRC

Documents

Transcript of Carbon Fiber Reinforced CFRC