Silicon Nitride Balls
Silicon nitride ball is a kind of precision ceramic sintered at high temperature in a non-oxidizing atmosphere. It has high strength, high wear resistance, high temperature resistance, corrosion resistance, acid and alkali resistance. It can be used in sea water for a long time. When at 800℃, the strength and hardness are almost unchanged, and the density is 3.20g/cm3 which almost 1/3 of the weight of the bearing steel. Moreover, the centrifugal force is small when rotating, so the high-speed operation can be realized. Silicon nitride balls also have self-lubricity, therefore it can be used for non-lubricated medium and high-polluting environment. In addition, they can be used as optional balls for the ceramic bearing and the mixed ceramic bearing.
Product Specification:
| Items | Unit | Silicon Nitride /Si3N4 |
| Rockwell Hardness | HRA | ≥75 |
| Volume Density | g/cm3 | 3.25 |
| Electric Volume Resistivity | Ω.cm | 1014 |
| Breaking Tenacity | Mpa m1/2 | 6~9 |
| Elasticity Modulus | Gpa | 300~320 |
| Thermal Expansivity | m/K *10-6/℃ | 3.1~3.3 |
| Thermal Conductivity | w/(m.k) | 15~20 |
| Weibull Modulus | m | 12~15 |
Product Application:
- Silicon nitride balls can be applied for various bearings with ultimate performance requirements, such as high speed or ultra-high speed bearings, high precision bearings, vacuum bearings, high or low temperature bearings, non-magnetic bearings, high precision ball screws.
- Silicon nitride can be used as valve balls, measuring balls using in chemical pump, high temperature pump and metering pump.
- Silicon nitride also can be used in sliding and measuring situation with various special requirements, such as high temperature slide rail and corrosion resistant slide rail.
- Silicon nitride ball is generally assembled into mixed bearings, which can be used in high-tech industries such as aviation, national defense, etc., as well as in chemical industry, metallurgy, medical treatment, food, oil field, electronics and other industries.
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