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697ceramic Bearing 7*17*5
697ceramic bearing have excellence performance as special electrical and magnetism resistance , could be used in awful environment andspecially condition.
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Comparison of bearing material technical data: |
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Performance |
Unit |
GCr15 |
9Cr18 |
Si3N4 |
ZrO2 |
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|
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Density |
g/cm3 |
7.8 |
7.9 |
3.2 |
6 |
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Thermal expansion α |
10-6/℃ |
11 |
17 |
3.2 |
10.5 |
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Elastic modulus E |
GPa |
208 |
200 |
320 |
210 |
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Poisson's ratioμ |
|
0.3 |
0.3 |
0.26 |
0.3 |
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HardnessHV |
|
800 |
700 |
1700 |
1300 |
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Flexural strength δ |
Mpa |
2400 |
2600 |
900 |
1000 |
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Compressive strength δ |
MPa |
|
|
2000 |
3500 |
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|
Toughness Kc |
Nm/cm2 |
20 |
25 |
7 |
11 |
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Thermal conductivity λ |
W/mk |
30-40 |
15 |
3.5 |
2.5 |
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Electric resistance Ω |
mm2/m |
1 |
0.75 |
1018 |
1015 |
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Specific heat |
J/KgK |
450 |
450 |
800 |
400 |
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Temperature |
.℃ |
120 |
150 |
1000 |
800 |
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Corrosion-resistant |
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No |
Weak |
Strong |
Strong |
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Stress cycles (50% failure probability) |
|
10*106 |
10*106 |
50*106 |
50*106 |
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Contact fatigue failure modes |
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Flake |
Flake |
Flake |
Flake/Break |
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Magnetic |
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Exist |
Exist |
Not Exist |
Not Exist |
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Dimensional stability |
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Poor |
Poor |
Good |
Good |
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Insulating |
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Not insulated |
Not insulated |
Good |
Good |
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