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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
|
| Young’s Modulus
|
GPa |
208 |
200 |
300~320
|
210 |
380
|
| Poisson’s 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)
|
-- |
10×107
|
-- |
10×107
|
10×105
|
|
| 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
|
|
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