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Si3N4 ceramic ball
Si3N4 ceramic ball

Si3N4 ceramic ball

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Si3N4 ceramic ball


  • Silicon nitride ceramic (Si3N4) is a new kind of bearing material with several good features, it possesses high temperature resistance, corrosion resistance, insulation, non-magnetism, high strength, low density and other features. In the application of bearing, it possesses low friction, low temperature rise, high rigidity, low centrifugal force and other features. It can implement high speed, high precision, high temperature, high rigidity, corrosion resistance and other good features.

    Silicon nitride ceramic ball with high precision and high performance  is manufactured by  spray-drying process, near-net-shape, cold isotatic pressing, GPS-HIP combined sintering, compounded abrasive lapping process effectively. The precision grade of it is G5, the materials class is I.

    Si3N4 ceramic ball material grades

    Class Materials class
    Item I II III
    Property Bending strengthσ3.40(Mpa) 900 800 600
    Crushing load ratio(%) 35 35 30
    Hardness(HV10) 1580 1480 1380
    Fracture toughness(Mpa.m1/2) 6.0 5.0 5.0
    The limit does of fiber structure Pore size(μm) 10 10 25
    Porosity(%) 0.02 0.06 0.06
    Crystal phase(μm) 10 10 25
    The second ceramic phase(μm) 25 25 25
    The maximum of inclusion of transverse section every Square centimeter Range 200(μm) 0 0 1
    Range 100~200(μm) 0 1 2
    Range 50~100(μm) 1 2 4
    Range 20~50(μm) 4 8 16

    Examples of Si3N4 ceramic ball’s common applications

      G3 G5 G10 G16 G20 G28 G40
    Class I High speed power equipment Space mechanism Aircraft instrument Liquid oxygen pump Active shaft bearing The key parts of aerospace equipment  
    Class II Molecular turbo-pump High precision star bearing Vacuum equipment, high speed instrument, mechanical devices, high performance and the most advanced contacting spherical propeller Motor, medium-low precision star bearing Testing bearing ball, separating bearing ball
    Class III     Sport, entertainment, food processing Mechanical devices

    Si3N4 ceramic ball specifications

    The nominal diameter of bearing ball The nominal diameter of bearing ball The nominal diameter of bearing ball
    mm in mm in mm in
    0.794 1/32 5   8.731 11/32
    0.8   5.5   9.525 3/8
    1   5.556 7/32 11.112 7/16
    1.588 1/16 5.953 15/64 12.303 31/64
    2   6   12.7 1/2
    2.381 3/32 6.35 1/4 13.494 17/32
    2.5   6.5   14.288 9/16
    3   6.747 17/64 15.081 19/32
    3.969 5/32 7   15.875 5/8
    4   7.144 9/32 19.05 3/4
    4.5   7.5   25.4 1
    4.762 3/16 7.938 5/16 31.75 1 1/4

    Note:The special specification can be manufactured after negotiating

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