advanced ceramics 2
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Definition
Ceramics
inorganic, nonmetallic solids
hardness, strength, low electrical conductivity,
and brittleness
Advanced Ceramics
represent an advancement over the traditional
high resistance to abrasion, excellent hot
strength, chemical inertness, high machining
speeds (as tools) and dimensional stability
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Classifications of Advanced
Ceramics Materials Oxides: Alumina, zirconia
Non-oxides: Carbides, borides, nitrides,silicides
Composites: Particulate reinforced,combinations of oxides and non-oxides.
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Categories of Ceramics
Electroceramics
Structural Ceramics
Ceramic Coatings
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Electroceramics
Electroceramic used to describe ceramic materials that have been specially
formulated for specific electrical, magnetic, or opticalproperties
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Common Applications for Electroceramics
Insulator
Resistor
High dielectric constant capacitors
Piezoelectric sonar transducers Ultrasonic transducers
Radio & communication filters
Medical diagnostic transducers
Ultrasonic motors
Electro-optic light valves
Thin-film capacitors
Ferroelectric thin-film memories
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Bulk Ceramic Thermistors
Bulk Ceramic Varistors(VDR-voltage dependentresistors)
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Bulk ceramic resistors
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Structural Ceramics
wear-resistant lightweight materials
superior to many materials with regard to stability
in high-temperature environments
remain hard and resist deformation at high
temperatures where metals soften or melt
resist cavitations and ablative wear; corrosion-
resistant inert
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Common Applications for Structural
Ceramics metal cutting
metal filters
brake pads
rotors
nozzles for water cutting
ink jet printing
rocket engines
Bioceramics Biocompatible
Flexible and durable metal oxides
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Ceramic Nozzle in Oil Wells
Fan Blades
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Ceramic Coatings
Ceramic coatings are a special film layer used
on hard materials to protect them from wear
and tear.
improved strength, hardness, elasticity, and
oxidation resistance
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Common Applications for Ceramic
Coatings
Industrial Parts
Automotive Parts
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Plasma sprayed Zirconia TitaniaYttria Ceramic Composite Coating over a Nickel Aluminium
Bond Coat
Coating sectioned from a piston ring
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Recent Developments
PSZ (partially stabilised zirconia) and phase
transformation toughening
Ron Garvie et alat the CSIRO, Melbourne
Phase transformations, alloying, quenching
and tempering techniques were applied to a
range of ceramic systems.
Significant improvements to the fracture
toughness, ductility and impact resistance of
ceramics
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Treatment of Cancer
Two methods of treatment
Hyperthermia treatment involves implanting a
bioceramic material that contains a ferrite or other
magnetic material. The area is then exposed to
alternating magnetic field, which causes the implant and
surrounding area to heat up.
Radiotherapy ,bioceramic materials can be doped with
-emitting materials and implanted into the cancerous
area
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Nanocomposite coating
manufacturing process nanocrystalline phase
amorphous phase
Nanocomposite ceramic coatings are mostly found inlaboratory instruments, surgical steel items and other
technologies that require highly specialized protection against
heat, corrosion and oxidation.