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.