Si3N4 Ceramic Bearing Ball/High Precision Silicon Nitride Ball
Silicon Nitride (Si3N4) is a widely used ceramic material in high temperature application, it has high strength in both room temperature and high temperature condition, the strength of silicon nitride can be kept up to 1200℃; the low coefficient of thermal expansion make it a ceramic material possessing excellent thermal shock resistance; at the same time, it also has good thermal conductivity.
Except for the excellent properties in thermal application, silicon nitride also has good mechanical, chemical, electrical properties. It has good strength, good flexture strength and wear resistance;it is a good performance electrical insulation ceramic material; it is corrosive against all inorganic acid, most of organic acid solutions and some of caustic soda solutions.
Key Properties of Silicon Nitride
UNIPRETEC provide high precision machining of Silicon Nitride ceramic components, with the experienced project engineers and talented workers, we can produce according to your drawings or designs, tight tolerance and good surface finishing can be reached. |
Unit | 95% Al2O3 | 99% Al2O3 | ZrO2 | GP-Si3N4 | |
Color | - | white | ivory | white | gray |
Density | g/cm³ | 3.65 | 3.88 | 5.95 | 3.22 |
Water Absorption | % | 0 | 0 | 0 | 0 |
Young's Modulus | Gpa | 280 | 350 | 205 | 295 |
Vickers Hardness | Gpa | 14 | 20 | 12 | 18-20 |
Flexural Strength ( at R.T. ) | Mpa | 280 | 300 | 900 | 650 |
Compressive Strength ( at R.T. ) | Mpa | 2000 | 2500 | 2200 | 2200 |
Thermal Conductivity ( at R.T. ) | W/(m.K) | 18-25 | 30 | 2.2 | 25 |
Thermal Shock Resistance | ΔT(°C) | 220 | 180-200 | 280-350 | 450-650 |
Max. Working Temperature ( at R.T. ) | °C | 1500 | 1700 | 850 | 1200 |
Volume Resistivity ( at R.T. ) | Ω.cm | >10^15 | >10^14 | >10^12 | >10^14 |
Dielectric Constant (1 MHz at R.T. ) | - | 9.50 | 9.80 | 26 | 8.20 |
Dielectric Strength | kV/mm | 16 | 22 | - | 16 |
1.Bearing balls and rollers
2.Cutting tools
3.Valves, turbocharger rotors for engines
4.Turbine blades
5.Glow plugs
6.Molten metal handling
7.Thermocouple sheaths
8.Welding jigs and fixtures
9.Welding nozzles
As a professional company in advanced ceramic industries, UNIPRETEC is manufacturing and supplying high quality and high precision ceramic components for clients from worldwide. Our ceramic products are widely used in various fields of automotive, metallurgy, machinery, electronic & electrical, food, chemical, medical and so on. With experienced engineers and talented workers, we are able to evaluate projects and drawings properly, make valuable suggestion, supply satisfying products. Our materials including:
- Aluminium Oxide ( 95% 96% 99% 99.5% 99.7% Al2O3 )
Aiming at building long term cooperation relationship with our clients, we set our motto as "Quality First". Far now, our products have been exported to North Amirica, East Europe, West Europe, East Asia, Southeast Asia and get good reputation from our client. |
| >>> Q: What are advanced ceramics? Advanced ceramics - also referred to as engineering, structural or technical ceramics - have been processed to be very pure and, in general, have superior properties to unrefined ceramics. Many are man-made, i.e. they do not occur naturally, e.g. silicon nitride, and their properties can be enhanced to produce very high strength at high temperatures, good corrosion resistance, etc. >>> Q: What types of ceramic do you supply? Alumina in purity from 90% to 99.7%, yttria stabilized zirconia (Y-PSZ), hot pressed boron nitride, machinable glass ceramic, boron carbide, silicon nitride, mullite and cordierite. >>> Q: Can I machine the ceramics myself? The harder ceramics like alumna and zirconia will require diamond tooling but other materials like Machinable Glass Ceramic and Hot Pressed Boron Nitride can be machined. To get the right result it does take time, experience and semi-specialised tooling but it can be done and many of our customers take advantage of this when they need extremely fast solutions in-house. >>> Q: Do you ship internationally? Yes, we can ship to virtually anywhere in the world. Typically we will use international express, like DHL, UPS, TNT, FEDEX, EMS... We can also arrange shipments on your own courier account if you prefer to take this route. >>> Q: Can I get a sample or purchase a small quantity? Yes, we are happy to supply small samples of material for you to test. We can also supply prototype quantities through to volume production to suit your needs. >>> Q: How long will it take for you to send me a quote? This depends totally on the complexity of your requirements. For simple items such as bars and rods, we can generally supply a quotation within 24 hours. >>> Q: What's the delivery time? For our standard products, like ceramic protection tubes and insulating rods, delivery time is normally 7 working days. For hot pressed boron nitride and machinable glass ceramic, it's about 10 working days. For customized products made of alumina, zirconia, boron carbide and silicon nitride, total producing time is about 30 working days. |
--- ZrO2 Ceramic Cutting Blades --- --- Ceramic Grinding Media --- --- Al2O3 Alumina Ceramic Parts ---