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    CERAMIC PRODUCT

     

    CERAMIC PRODUCT

           1. SPECIFICATION

    Item

    Unit

    Steel

    Si3N4

    ZrO2

    Al2O3

    Density

    g/cm3

    7.85

    3.20-3.30

    6.05

    3.95

    Thermal Expansion Coefficient

    10-6/k

    10.0

    3.2

    10.5

    9.1

    Elastic Modulus

    GPa

    208

    300-320

    210

    380

    Possion Ratio

     

    0.30

    0.26

    0.30

    0.27

    Hardness

    (HV)

     

    700

    1500-1800

    1200

    1800

    (HRC)

     

    62

    75-80

    70

    80

    Bending Strength(800℃)

    MPa

    2400

    200

    300

    220

    Crushing Strength(800℃)

    MPa

    --

    1400

    2100

    1500

    Fracture Toughness

    MPa.m1/2

    25.0

    6.0-7.0

    10.0

    3.5

    Thermal Conductivity(500℃)

    W/mk

    30-40

    18

    2

    25

    Specific Resistivity(600℃)

    Ω.mm2/m

    0.1-1

    1018

    1015

    108

    Max Usage Temperature

    300

    800

    550

    1850

    Corrosion Resistance

     

    Worse

    Better

    Better

    Better

    Fatigue Stress Recycles(50% Fail)

    Times

    107

    107~109

    105

    -

    Dimension Stablity with Temperature

     

    Large

    Little

    -

    -

    Centrifugal Force

     

    Large

    Little

    Large

    Medium

    Non-Lubrication Friction

     

    Large

    Little

    Little

    Little

    Magnetism

     

    Exist

    Naught

    Naught

    Naught

    Failure Mode under Rolling Contract

     

    Flake

    Flake

    Smash

    Smash

    OTHER SPECIFICATIONS CAN BE DISCUSSED AS PER BUYER’S OPTION

            2. PACKING

    PLASTIC FILM (INNER LAYER) AND CARTON BOX OR PLYWOOD CASE (OUTER LAYER)

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