 |
 |
 |
|
|
|
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
CVD SILICON CARBIDE®
Temperature Dependent Properties
CVD
SILICON CARBIDE® is a high temperature material with a sublimation
temperature of about 2700 degrees C. In an inert environment this material
can be conveniently used up to a temperature of 2000 degrees C. Above this
temperature, there is an onset of phase change from cubic beta phase to hexagonal
alpha phase. As one can see in the table below, the material can be safely
used up to a temperature of 1500 degrees C in air with a good retention of
thermal and mechanical properties.
Summary of Temperature Dependence
of Important Mechanical, Electrical and Thermal Properties of
CVD SILICON CARBIDE®
| DEGREES C | -140 | -100 | 0 | 200 | 500 | 700 | 1000 | 1200 |
| Specific Heat (JKg-1K-1) |
175 | 301 | 574 | 952 | 1134 | 1189 | 1251 | 1295 |
| Thermal Conductivity (Wm-1K-1) |
396 | 485 | 333 | 221 | 137 | 110 | 78 | 63 |
| Thermal Expansion Coefficient (K-1 x 10-6) |
0.4 | 0.8 | 1.9 | 3.7 | 4.6 | 4.9 | 5.0 | 5.1 |
| Elastic Modulus (GPa) |
- | - | 460 | 457 | 450 | 440 | 435 | 422 |
| Flexural Strength (MPa) |
460 | 465 | 470 | 480 | 500 | 515 | 540 | 555 |
 |
|
 |
 |