Si3N4 Silicon Nitride Ceramic Bearing Balls G5
The prime features of silicon nitride ceramic bearing ball
1.Low density: 3.2 g/cm
3 with lightweight than most other technical ceramics
2. Superior hardness, it's one of the hardest technical ceramic than others
3. Great wear resistance due to its exceptional hardness and self-lubricity
4. Low coefficient of thermal expansion and high thermal conductivity (20 W/m.k)
5. Great thermal shock resistance, it's up to 1000ºC under the special atmosphere
6. High mechanical strength and well resistance to impact than other advanced ceramics
7. Heat & high-temperature resistance, The max. service temperature can be up to 1300ºC
8. Chemical and corrosion resistance, resistant to almost all inorganic acids and many organic acids
9. At the same time, Silicon nitride is a high-performance electrical insulation material
The specification of the ceramic bearing ball
| Material option |
Silicon nitride(Si3N4), Zirconia (ZrO2), Silicon carbide(SiO2) |
| Forming methods |
Dry pressed, Ceramic injection molding, Hot pressed, ISO pressed |
| Specification |
OD can be from 1 to 50mm, length can be from 10mm to 800mm |
| Precision processing |
CNC machining, Precision grinding, Polishing, Lapping, |
| Tolerance |
The tolerance of OD and ID can be 0.001mm, the tolerance of length can be 0.001mm |
| Key parameters |
Roughness to be 0.02mm, Parallelism to be 0.001mm |
| Surface quality |
Free of cracks, foreign contamination, mirror surface better than Ra0.1 |
The description of silicon nitride ceramic bearing ball
Silicon nitride is a man-made compound synthesized through several different chemical reaction methods. Parts are pressed and sintered by well-developed methods to produce a ceramic with a unique set of outstanding properties. The material is dark gray to black in color and can be polished to a very smooth reflective surface, giving parts a striking appearance. High-performance silicon nitride materials were developed for automotive engine wear parts, such as valves and cam followers, and proven effective. The cost of the ceramic parts never dropped enough to make the ceramics feasible in engines and turbochargers. The very high-quality bodies developed for these demanding high-reliability applications are available today and can be used in many severe mechanical, thermal, and wear applications.
The typical application of silicon nitride ceramics
They are widely used for producing bearings, shaft, gas turbine blades, mechanical seal rings, and permanent molds, steam nozzle, the heated surfaces of engine components
The gallery of Si3N4 ceramic parts
Datasheet of Technical ceramics
| Property |
Unit |
Material |
| Si3N4 |
99.5% Al2O3 |
99% Al2O3 |
96%
Al2O3 |
ZrO2 |
| Density |
g/cm3 |
≥3.20 |
≥3.90 |
≥3.85 |
≥3.65 |
≥6.0 |
| Water absorption |
% |
- |
0 |
0 |
0 |
0 |
| Hardness |
HV |
- |
1700 |
1700 |
1500 |
1300 |
| Flexural strength |
Mpa |
≥600 |
≥379 |
≥338 |
≥320 |
≥1200 |
| Compressive strength |
Mpa |
≥2500 |
≥2240 |
≥2240 |
≥2000 |
≥1990 |
| Fracture toughness |
Mpa m1/2 |
6 |
4-5 |
4-5 |
3-4 |
6.5-8 |
| Max. service temperature |
ºC |
1200 |
1675 |
1600 |
1450 |
1000 |
| Coefficient of thermal expansion (CTE) |
1×10 -6 /ºC |
3.2 |
6.5~8.0 |
6.2~8.0 |
5.0~8.0 |
8.0~9.5 |
| Thermal shock |
T(ºC) |
≥600 |
≥250 |
≥200 |
≥220 |
≥300 |
| Thermal conductivity(25ºC) |
W/m.k |
20 |
30 |
29 |
24 |
3 |
| Volume resistivity |
ohm.cm |
|
|
|
|
|
| 25ºC |
- |
>1 x 10 14 |
>1 x 10 14 |
>1 x 10 14 |
>1 x 10 11 |
| 300ºC |
- |
1 x 10 12 |
8 x 10 11 |
10 12 -10 13 |
1 x 10 10 |
| 500ºC |
- |
5 x 10 10 |
2 x 10 9 |
1 x 10 9 |
1 x 10 6 |
| Insulation strength |
KV/mm |
|
19 |
18 |
18 |
17 |
| Dielectric constant(1Mhz) |
(E) |
6 |
9.7 |
9.5 |
9.5 |
29 |
Our capability and strength
We have in-housing comprehensive manufacturing types of equipment, including forming, sintering,
CNC machining, precision grinding, laser cutting, and so on, helps us to control the quality very well.
Also, it greatly benefits cost control.
The state of the art manufacturing equipment
Rigorous Quality-control System
Remark:
We have the complete quality-control system per ISO9001, including IQC, IPQC, QA, and OQC process.
Typical Packaging Proposal and Transportation Methods
1. Packaging proposal
2. Regular Transporation Methods
FAQs (Frequently Asked Questions)
Q1. Are you a factory or trading company?
A: We are a manufacturer with over 12 years of experience. You are welcome to visit our factory.
Q2: Do you send a sample to check?
A: Sure, the sample is free and freight collect.
Q3: When will you ship it?
A: If the products are in storage, we'll ship within 48 hours
Q4: When can I get the price?
A: We regularly quote within 24 hours after we get your inquiry. If you are in urgent need of getting the price.
Please call us or tell us in your email so that we will proceed with your inquiry as a priority.
Q5: Is it available to provide customized products?
A: We always support custom-made demand as per different materials, dimensions, and designs.
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