ADVANCED CERAMICS — SILICON CARBIDE CERAMICS
As one of the modern engineering ceramics, the hardness of silicon carbide ceramics is only inferior to diamond. It has small thermal expansion coefficient, high thermal conductivity, good chemical stability and high wear resistance. At high temperature, it still has outstanding physical and chemical properties such as good mechanical properties and oxidation resistance, which has become a structural ceramic with great development prospects.
Sintered silicon carbide
Recrystallized silicon carbide
Reaction sintered silicon carbide
SiC workbench
SiC honeycomb ceramics
SiC Film
3D printing SiC
Sialon SiC
|
Physical performance |
SiC |
Si3N4 |
AI2O3 |
MgO |
|
Density（g/cm3） |
3.0~3.2 |
3.16 |
3.7-3.9 |
3.58 |
|
Melting point（℃） |
2800 |
1900 |
2050 |
2800 |
|
Hardness |
23~25 GPa |
9（Mohs hardness） |
9（Mohs hardness） |
6（Mohs hardness） |
|
Thermal conductivity index（W/m·k） |
33.5~502 |
12.56（RT） |
31.4（RT） |
159.1（RT） |
|
Coefficient of thermal expansion（10-6/℃） |
4~5 |
2.5~3.5 |
6.8~8 |
10.0~13.0 |
|
Elastic modulus（GPa） |
350~370 |
250~320 |
310~390 |
350 |
|
Bending strength（MPa） |
590 |
1000 |
3700 |
140 |
|
Dielectric constant /1MHz |
- |
9.4 |
9~10.5 |
9.1 |
|
Dielectric loss /1MHz（X10-4） |
- |
- |
1~3 |
1~2 |
Applications of SiC
| Application Fields | Using Conditions | Application | Major advantages |
| Oil industry | High temperature and high pressure | Nozzle, bearing, valve piece | Wear resistance and high temperature resistance |
| Mining industry | Wear, corrosion, grinding | Linings, pump parts | Wear resistance |
| Chemical industry | Strong acid, strong base, high oxidation | Seal and pump parts | Air tightness and wear resistance |
| Sandblasting machine | High speed grinding | Nozzle | Wear resistance |
| Paper industry | Paper pulp solution | Seals, sleeve bearings, gaskets | Corrosion and wear resistance |
| Refractory material industry | High temperature kiln | Shed plate, support and beam | High temperature resistance |
| Microelectronics industry | High power heat dissipation | Packaging materials and substrates | High thermal conductivity and insulation |
| automotive industry | Combustion engine | Turbocharger, etc | Low friction |
| Laser industry | High power, high temperature | Reflecting screen | High stiffness and stability |
| atomic energy industry | High temperature water | Seal, shaft sleeve | Radioresistance |
| Other industries | Processing engineering project | Drawing forming molds | Wear and corrosion resistance |