Open Access
Table 2
Physical parameters of the materials.
| Physical parameters | Glass | SiC | Al2O3 | ZrO2 | Graphite coating |
|---|---|---|---|---|---|
| Relative dielectric constant ε | 6.8 | 12.226 | 7.3 | 3.2 | 15 |
| Loss tangent tan δ | 0.01 | 0.08 | 0.0003 | 0.0005 | 0.2 |
| Thermal expansion coefficientα (10−6/°C) | 9 | 4 | 7.5 | 10.1 | – |
| Modulus of elasticity E ′ (GPa) | 68.9 | 360 | 370 | 200 | – |
| Poisson's ratio v | 0.23 | 0.142 | 0.22 | 0.25 | – |
| Thermal conductivity a (W/m · °C) | 3 | 40 | 25 | 7 | – |
| Specific surface energy γ (N/m) | 8 | 33.3 | 45 | 155 | – |
| Density ρ (g/cm3) | 2.5 | 3.8 | 3.9 | 6.8 | – |
| Specific heat c (J/Kg · °C) | 835 | 450 | 880 | 450 | – |
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