G10 Silicon Nitride Ceramic Si3n4 Bearing Balls
Description:
Silicon nitride ceramic balls are precision ceramics 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, and can be used
for in seawater for a pretty long time with good electrical and
magnetic insulation.
Its density is only 3.20g/cm3 which is almost 1/3 of the weight of
bearing steel, and this makes it has small eccentric force and can
achieve high speed rotation. with the property of self-lubricating,
it can be used under the environment where there is no lubricating
medium and has high pollution, thus makes it the first choice for
ceramic bearings and hybrid ceramic ball bearings.
Technical Parameters:
| Mechanical behavior | Unit | Al2O3 | SiC | Si3N4 | ZrO2 |
| Colour | ------- | Light yellow | black | black | white,black |
| Density | g/cm3 | 3.95 | 3.15 | 3.2 | 6 |
| Bending strength | MPa | 300～400 | 400～500 | 800～1200 | 950～1200 |
| Elastic modulus E | GPa | 380 | 350 | 300-320 | 210 |
| Poisson's ratio | | 0.22 | 0.14 | 0.26 | -------- |
| Hardness | Hv | 1800 | 2000～2500 | 1400～1700 |
1100～1300 |
| HRC | 80 | 85～90 | 75～80 | 70～75 |
| Fracture toughness | MPa·m1/2 | 3.0～4.0 | 3.0～4.0 | 5.0～7.0 | 8.0～10.0 |
| Maximum use temperature | ℃ | 1000 | 1300 | 400 | 400 |
| Thermal expansion coefficient | 10-6/℃ | 8.4 | 4 | 3.3 | 10.3 |
Advantages:
1. Excellent high temperature strength.
2. High breaking strength.
3. excellent thermal shock-resistant.
4. Resist to chemical corrosion.
5. lubricating property.
Application:
Most ceramic balls are mounted in the bearing (high-speed bearing,
high precision bearing, vacuum bearing, high/low-temperature
bearing, nonmagnetic bearing, high precision ball screws) for the
high technology industry, such as aerospace and national defense
and etc. The ceramic balls can also be used for chemistry,
metallurgy, medical treatment, food industry, oilfield, electronic
engineering and etc.
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