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99.7% alumina ceramic

Material is MARTOXID® MR70/S,SUMITOMO AM-21 etc..
Germany standard: C799.
High density, high mechanical strength.
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    Performance of 99.7% alumina ceramic

     

    Performance

    Unit

    Alumina Ceramic

    Content of Alumina

    wt%

    ≥ 99.7

    Volume Density

    g /cm3

    3.90

    Hardness (HRA)

    HRA ≥

    88

    Bending Strength

    MPa ≥

    400

    Max Working Temperature

    ℃ ≥

    1500

    Gastightness Test

     

    Pass

    Thermal shock testing

     

    Pass

    Thermal expansivity

    ×10-6/℃

    8.2

    Dielectric Constant

    εr20℃, 1MHz

    9.2

    Dielectric Loss

    tanδ××10-4, 1MHz

    2

    Volume Resistivity

    Ω·cm 20℃

    1014

    Breakdown Strength

    KV/mm , DC≥

    20

    Acid Resistance

    mg/cm2 ≤

    0.7

    Alkali Resistance

    mg/cm2 ≤

    0.1

    Wearability

    g/cm2 ≤

    0.1

    Compressive Strength

    M Pa ≥

    2800

    Bending Strength

    M Pa ≥

    350

    Modulus of Elasticity

    GPa

    350

    Poisson ration

     

    0.22

    Thermal Conductivity

    W/m·K( 20℃)

    25

     

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