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The Properties and Uses of Advanced Materials Like Carbon Fi
Transcript of The Properties and Uses of Advanced Materials Like Carbon Fi
The Properties and Uses of Advanced Materials Like Carbon Fibers, Ceramics, Micro-alloys, etc.
Physical strength, specific toughness, light weight.
Good vibration damping, strength, and toughness.
High dimensional stability, low coefficient of thermal expansion, and low abrasion.
Biological inertness and x-ray permeability.
Fatigue resistance, self-lubrication, high damping.
Chemical inertness, high corrosion resistance.
Aerospace, road and marine transport, sporting goods.
Missiles, aircraft brakes, aerospace antenna and support structure, large telescopes, optical benches, waveguides for stable high-frequency (GHz) precision measurement frames.
Audio equipment, loudspeakers for Hi-fi equipment, pickup arms, robot arms.
Automobile hoods, novel tooling, casings and bases for electronic equipments, EMI and RF shielding, brushes.
Medical applications in prostheses, surgery and x-ray equipment, implants, tendon/ligament repair.
Textile machinery, genera engineering.
Chemical industry; nuclear field; valves, seals, and pump components in process plants.
Large generator retaining rings, radiological equipment.
Carbon fiber is a high-tensile fiber or whisker made by heating rayon or polyacrylonitrile fibers or petroleum residues to appropriate temperatures. Fibers may be 7 to 8 microns in diameter and are more that 90% carbonized.
These fibers are the stiffest and strongest reinforcing fibers for polymer composites, the most used after glass fibers. Made of pure carbon in form of graphite, they have low density and a negative coefficient of longitudinal thermal expansion.
Ceramics encompass such a vast array of materials that a concise definition is almost impossible. However, one workable definition of ceramics is a refractory, inorganic, and nonmetallic material. Ceramics can be divided into two classes: traditional ceramics and advanced ceramics.
Traditional ceramics include clay products, silicate glass and cement
Advanced ceramics consist of carbides (SiC), pure oxides (Al2O3), nitrides (Si3N4), non-silicate glasses and many others.
In general, advanced ceramics have the following inherent properties:
-Hard (wear resistant)
-Resistant to plastic deformation
-Resistant to high temperatures
-Good corrosion resistance
-Low thermal conductivity
-Low electrical conductivity
However, some ceramics exhibit high thermal conductivity and/or high electrical conductivity.
The combination of these properties means that ceramics can provide:
-High wear resistance with low density
-Wear resistance in corrosive environments
-Corrosion resistance at high temperatures
-Aerospace: space shuttle tiles, thermal barriers, high temperature glass windows, fuel cells
-Consumer Uses: glassware, windows, pottery, Corning¨ ware, magnets, dinnerware, ceramic tiles, lenses, home electronics, microwave transducers
-Automotive: catalytic converters, ceramic filters, airbag sensors, ceramic rotors, valves, spark plugs, pressure sensors, thermistors, vibration sensors, oxygen sensors, safety glass windshields, piston rings
-Medical (Bioceramics): orthopedic joint replacement, prosthesis, dental restoration, bone implants
-Military: structural components for ground, air and naval vehicles, missiles, sensors
-Computers: insulators, resistors, superconductors, capacitors, ferroelectric components, microelectronic packaging
-Other Industries: bricks, cement, membranes and filters, lab equipment
-Communications: fiber optic/laser communications, TV and radio components, microphones
for second quarter
It has varied properties which depend on the metal it’s going to be added. Main properties of micro-alloys are: (1) it improves strength, (2) may increase electromagnetism, and (3) many other physical properties.
Specific alloy combination usually designed for special strength, ductility or flexibility. A foreign metal added to another metal to improve its properties.