Silicon Nitride Ceramic Bearing Ball
Product Details
Feature
BNS Ceramic Ball bearings made of silicon nitride, silicon carbide, zirconia oxide and alumina oxide are kept in our stock series. They are advantageous in having a longer service life, lower friction resistance, higher seizure resistance, higher corrosion resistance, higher rigidity, higher temperature resistance ( up to 800C) lightweight (40% of bearing steel), non magnetic, and insulated. They can be used even in an extra high – vacuum environment.
Physical Properties
Item | Density | Coefficient | Elasticity Modulus | Poisson’s
Ratio |
Hardness
(HV) |
Hardness
(HRC) |
Bending Strength | Compressive
Strength |
Unit | g/cm3 | 10-6/k | Gpa | Mpa | Mpa | |||
Si3N4 | 3.23 | 3.2 | 300-320 | 0.26 | 1500-1800 | 75-80 | 200 | 1400 |
Item | Fracture Toughness | Thermal Conductivity | Electrical Resistivity | Highest Temp | Acid and Alkali Corrosion resistance performance | Stress Cycles (50% failure probalility) | ||
Unit | Mpa·m1/2 | W/mk | Ω·mm2/m | ℃ | Strong | Times | ||
Si3N4 | 6.0-7.0 | 18 | 1018 | 800 | 107-109 | |||
Item | Dimensions stability | Certrifugal
Force |
Non-lubrication
Friction |
Magnetism | Rolling contact
Fatigue Failure mode |
|||
Unit | ||||||||
Si3N4 | With the temp,change is Small | small | small | None | Peel Off |