608ceramic Bearing 8*22*7
608ceramic Bearing 8*22*7
688ceramic bearing have excellence performance as special electrical and magnetism resistance , could be used in awful environment andspecially condition.
Performance |
Unit |
GCr15 |
9Cr18 |
Si3N4 |
ZrO2 |
Density |
g/cm3 |
7.8 |
7.9 |
3.2 |
6 |
Thermal expansion α |
10-6/℃ |
11 |
17 |
3.2 |
10.5 |
Elastic modulus E |
GPa |
208 |
200 |
320 |
210 |
Poisson's ratioμ |
|
0.3 |
0.3 |
0.26 |
0.3 |
HardnessHV |
|
800 |
700 |
1700 |
1300 |
Flexural strength δ |
Mpa |
2400 |
2600 |
900 |
1000 |
Compressive strength δ |
MPa |
|
|
2000 |
3500 |
Toughness Kc |
Nm/cm2 |
20 |
25 |
7 |
11 |
Thermal conductivity λ |
W/mk |
30-40 |
15 |
3.5 |
2.5 |
Electric resistance Ω |
mm2/m |
1 |
0.75 |
1018 |
1015 |
Specific heat |
J/KgK |
450 |
450 |
800 |
400 |
Temperature |
.℃ |
120 |
150 |
1000 |
800 |
Corrosion-resistant |
|
No |
Weak |
Strong |
Strong |
Stress cycles (50% failure probability) |
|
10*106 |
10*106 |
50*106 |
50*106 |
Contact fatigue failure modes |
|
Flake |
Flake |
Flake |
Flake/Break |
Magnetic |
|
Exist |
Exist |
Not Exist |
Not Exist |
Dimensional stability |
|
Poor |
Poor |
Good |
Good |
Insulating |
|
Not insulated |
Not insulated |
Good |
Good |
Performance |
Unit |
Boron carbide |
Aluminum oxide |
Toughened Aluminum oxide |
Zirconium oxide |
Silicon nitride |
Silicon carbide |
Symbol |
B4C |
99% Al2O3 |
ZTA-20% |
ZrO2 |
Si3N4 |
SiC |
|
Density |
g/cm3 |
2.4~2.51 |
3.7~3.99 |
5.5 |
6 |
3.2 |
3.2 |
Hardness HV |
Kg/mm |
2700~3200 |
2300~2700 |
1470~1500 |
1300~1500 |
1700 ~2700 |
2350~2450 |
Flexural strength |
MPa |
350~400 |
300~400 |
700 |
1000~1500 |
900 |
450~800 |