Compositepresentation 140318211701 Phpapp02
Compositepresentation 140318211701 Phpapp02
Compositepresentation 140318211701 Phpapp02
Peshawar
Materials Engineering Department
Presented By:
Mohsin Ali Marwat
Presented To:
Dr. Rizwan Gul
Contents
• Introduction
• Classifications
• Processing Methods
• Applications
• Trade Names
• Availability in Pakistan
Introduction Definition
A materials system composed of a mixture or combination
of two or more micro or macro- constituents that differ in
form and chemical composition and are essentially
insoluble in each other.
Composite
Materials General Properties:
•High Strength-to-weight ratio
•Corrosion Resistance
•Wear Resistance
•Greater fatigue Life
•Low electrical conductivity
•Anisotropic
•Lower cost
•Easy processing
•Covers almost all application areas
Introduction Factors affecting Microstructure and properties of
composites
• Type of Reinforcement
• Fiber-Volume-Fraction (FVF)
• Direction of loading
Composites
Composite
Materials
Particulate Fiber Laminate
– Type of Fibers:
• Aramid
• Glass
• Carbon
• Fibers:
Reinforcement – Long relative to particulates
Matrix
Materials •High Tensile Strength
•High Specific Gravity
•High Toughness (For Large diameter Fiber)
•High Creep Resistance
•High Elastic Modulus
•Examples:
– Boron/Aluminum Composite
– SiC/Aluminum Composite
Classification MMC
Matrix
Materials
Classification Diffusion Bonding
Matrix
Materials
Classification Ceramic Matrix Composites
Material having Ceramic as a matrix material in
composites is called a ceramic matrix composite.
Properties:
•High strength
Matrix
•Hardness
Materials
•High service temperature
•Chemical inertness
•Low density
Matrix SiC Whisker Flexural Fracture
Content (Vol%) Strength (MPa) Toughness
(Mpa/(m) ½
Si3N4 0 400-650 5-7
10 400-500 6.5-9.5
30 350-450 7.5-10
Al2O3 0 ------ 4.5
10 400-510 7.1
20 520-790 7.5-9.0
Source: “Engineered Materials Handbook”, Vol 1, Composite, ASM, 1987
Classification Ceramic
CeramicMatrix
MatrixComposite
Compositeand
andNanotechnology
Nanotechnology
80-85% Alumina
5-10% Carbon Nanotubes
5% finely Milled Niobium Sintered and Densified
Matrix
Materials
Properties:
High Fracture Strengths i.e. Five times greater than
Alumina
Ten trillion times greater conduction of Electricity than
pure alumina
Conducts heat if C fibers are oriented parallel to the heat
flow
Insulate heat if C fibers are oriented perpendicular to the
heat flow
Classification Polymer Matrix Composites
Methods
Roving or tow Roving guide
package
Rotating
Mandrel
• Resin spreads
• Pull + Extrusion
• Fibers are impregnate with resin
• Preheating of fibers
Methods
• pulled through a heated Die (Extrusion)
• Curing in “Curing Die”
Processing 8. Sheet Molding Compound (SMC)
• Spreading resin and filler paste on a carrier film
• Sprinkling Chopped fibers
• Spreading another resin and filler paste layer
Methods • Compacting and removing air entrapped via compact
mills
• Storing on the Take-Up Roll
Applications
Trade Names
Manufacturer:
– CYTEC
– Automative Armor Manufacturer (AAM)
– 3Tex Inc. (3d fiber designing)
– Avanced Carbon Technology Inc.
– Dupont
– Bayliner (GFRP Boats)