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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