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Bearing material properties chart
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Bearing material properties chart
























































































































































































Items Units Bearing Steel Stainless Steel Ceramic Si3N4 Ceramic ZrO2 Ceramic Al 2O3
Density g/cm3 7.85 7.90 3.20~3.30 6.00 3.95
Coefficient of linear expansion 10-6/ K 10.0 11.0 3.2 10.5 8.5
Youngs Modulus GPa 208 200 300~320 210 380
Poissons ratio -- 0.30 0.30 0.26 0.30 0.22
Hardness Hv10HRc 700 62 66 1500~1800 75~80 1200 70 1800 80
Bending strength MPa 2400 -- 800~1000 950~1200 300~500
Fracture toughness MPam-1/2 25 -- 6.0~7.0 10.0 3~4
Thermal conductivity W/mk 30~40 15 35 2~3 30
Special electrical resistance Omm2/m 0.1~1 0.75 1018 1015 1018
Heat resistance C 120 300 800 -- --
Corrosion resistance -- Low Medium High High High
Stress cycles(50% failed) -- 1007 -- 1007 1005 nbsp;
Nonlubrication friction -- High High Low -- --
Magnetism -- magnetic magnetic non- magnetic non- magnetic non- magnetic
Centrifugal force -- Very high Very high Very low High medium
Operate temperature increasing -- high high low -- --
Size stability -- Low Low High High High
Conductivity -- conductor conductor insulator insulator insulator


( Sally )1 Feb,2010

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