683 ceramic bearing have excellence performance as special electrical and magnetism resistance , could be used in awful environment andspecially condition.
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Properties comparision of ceramic material: |
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Performance |
Unit |
Boron carbide |
Aluminum oxide |
Toughened Aluminum oxide |
Zirconium oxide |
Silicon nitride |
Silicon carbide |
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|
Symbol |
B4C |
99Al2O3 |
ZTA-20% |
ZrO2 |
Si3N4 |
SiC |
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Density |
g/cm3 |
2.4~2.51 |
3.7~3.99 |
5.5 |
6 |
3.2 |
3.2 |
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Hardness HV |
Kg/mm |
2700~3200 |
2300~2700 |
1470~1500 |
1300~1500 |
1700 ~2700 |
2350~2450 |
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|
Flexural strength |
MPa |
350~400 |
300~400 |
700 |
1000~1500 |
900 |
450~800 |
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Compressive strength |
MPa |
1800~2500 |
2800~3500 |
2000 |
2000 |
3500 |
2250~3000 |
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Fracture toughness |
Mpa·m-3/2 |
6 |
2~4 |
5~6 |
11 |
7 |
4~5 |
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Weibull modulus |
GPa |
|
> 7 |
> 10 |
> 15 |
> 15 |
> 6 |
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Modulus of elasticity |
GPa |
|
407 |
260 |
210 |
320 |
410 |
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Poisson's ratio |
|
|
0.2 |
0.23 |
0.3 |
0.26 |
0.16 |
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Thermal expansion coefficient |
×10-6/℃ |
4.5 |
6.5~8.6 |
9.4 |
10.5 |
3.2 |
4.3 |
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Thermal shock resistance |
ΔT℃ |
|
200 |
470 |
250 |
500 |
350 |
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Electric resistance |
Ω/cm2 |
0.3 ~ 0.8 |
>1014~1016 |
>1010 |
>1010 |
> 1014 |
100 ~2 |
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