Jan 6 2004
Background
Silicon Carbide - Hot Pressed Silicon Carbide is a high density, high strength material which has been used in refractory applications for many years. It is now used for a wide range of engineering applications.Silicon Carbide - Hot Pressed Silicon Carbide can be highly polished and has potential for space-based mirrors, because of its high specific strength and stiffness compared with those of glass.
Key Properties
The key properties of Silicon Carbide ( SiC ) - Hot Pressed Silicon Carbide are tabulated below.
Table 1. Key properties
| Chemical Resistance |
| Acids - concentrated |
Good |
| Acids - dilute |
Good |
| Alkalis |
Good-Poor |
| Halogens |
Good-Poor |
| Metals |
Fair |
| Electrical Properties |
| Dielectric constant |
40 |
| Volume resistivity ( Ohm.cm ) |
103-105 @ 25 °C |
| Mechanical Properties |
| Compressive strength ( MPa ) |
1000-1700 |
| Hardness - Vickers ( kgf.mm-2 ) |
2400-2800 |
| Shear strength ( MPa ) |
210-380 |
| Tensile modulus ( GPa ) |
200-500 |
| Tensile strength ( MPa ) |
400 |
| Physical Properties |
| Apparent porosity ( % ) |
0 |
| Density ( g.cm-3 ) |
3.15 |
| Thermal Properties |
| Coefficient of thermal expansion ( x10-6 K-1 ) |
4.5 @ 20-1000 °C |
| Melting point ( °C ) |
2650-2950 |
| Specific heat ( J.K-1.kg-1 ) |
670-710 @ 25 °C |
| Thermal conductivity ( W.m-1.K-1 ) |
90-160 @ 20 °C |
| Upper continuous use temperature ( °C ) |
1500-1650 |
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