| Model: | UPT-020 |
|---|---|
| Brand: | UNIPRETEC |
| Origin: | Made In China |
| Category: | Metallurgy , Mining & Energy / Metallurgy & Mining / Non-metallic Mineral Products |
| Label: | silicon nitride , si3n4 ceramic , technical ceramic |
| Price: |
US $10
/ pc
|
| Min. Order: | 100 pc |
| Live Chat: | Last Online:04 May, 2016 |
Silicon nitrides (Si3N4) feature an excellent combination of material properties. They are nearly as light as silicon carbide (SiC), but their microstructure gives them excellent thermal shock resistance and their high fracture toughness makes them resistant to impacts and shocks.
Key Properties of Silicon Nitride
*High strength over a wide temperature range
*High fracture toughness
*High hardness
*Outstanding wear resistance, both impingement and frictional modes
*Good thermal shock resistance
*Good chemical resistance
Different Types of Silicon Nitride Ceramics
(1)Gas Pressured Sintered Silicon Nitride(GPSN)
GPSN is a family of fully dense materials having a range of compositions that are produced in cost effective, complex net shapes. This grade of silicon nitride has the best combination of properties making it the leading technical ceramic for a number of structural applications.
(2)Hot Pressed Silicon Nitride Ceramics(HPSN)
HPSN is formulated into a variety of compositions having minimal densification aids. These HPSN compositions offer the highest hardness of UNIPRETEC's silicon nitrides. Finished components are machined at precision diamond grinding facility.
Typical Silicon Nitride applications
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
| Characteristics | Unit | 95 Al2O3 | 99 Al2O3 | ZrO2 | GPSi3N4 | BN | Glass Ceramic |
| Crystal Structure | - | hexagonal | hexagonal | tetragonal | hexagonal | hexagonal | - |
| Color | - | white | ivory | white | gray | white | white |
| Density | g/cm3 | 3.65 | 3.88 | 5.95 | 3.22 | 2.26 | 2.55 |
| Water Absorption | % | 0 | 0 | 0 | 0 | 0.0-1.0 | 0 |
| Young's Modulus | Gpa | 280 | 350 | 205 | 295 | 670 | 65 |
| Vickers Hardness | Gpa | 14 | 20 | 12 | 18-20 | - | - |
| Flexural Strength | Mpa | 280 | 300 | 900 | 650 | 51 | 100 |
| Compressive Strength | Mpa | 2000 | 2500 | 2200 | 2200 | 230 | 500 |
| Thermal Conductivity | W/(m·k) | 18-25 | 30 | 2.2 | 25 | 20 | 1.7 |
| Thermal shock resistance | Δ(℃) | 220 | 180-200 | 280-350 | 450-650 | >1500 | 25-100 |
| Max. Working Temperature | ℃ | 1500 | 1700 | 850 | 1200 | 960 | 800 |
| Volume Resistivity | Ω·cm | >10^15 | >10^14 | >10^12 | >10^14 | 10^13 | 10^16 |
| Dielectric Constant (1 MHz ) | - | 9.5 | 9.8 | 26 | 8.2 | 4.08 | 6.02 |
| Dielectric Strength | kV/mm | 16 | 22 | - | 16 | 375 | 40 |
About UniPreTec
UniPreTec provides high-performance ceramic products in Alumina, Zirconia, Zirconia Toughened Alumina, Silicon Carbide, Silicon Nitride and further special materials. Along with these materials, we offer several machining from which to choose such as cutting, drilling, sawing, turning, grinding, polishing etc.. Furthermore, our technologies and equipments allow us to provide various and flexible forming processes, like dry pressing, isostatic pressing, extrusion, injection moulding and slip casting.
