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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 Silicon nitride ceramic ball 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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