Open Access
Table 2
Basic parameters of tested ceramics.
| Parking according to ČSN EN 60672 | Symbol | Unit | CORDIERIT C410 |
Corundum ceramics C799 |
|---|---|---|---|---|
| Commercial name | TH 7/7 R12 BM | Luxal 203 | ||
| Porosity | pa | [%] | 0.5 | |
| Density | ρa | [g.cm–3] | 2.1 | min. 3.8 |
| Bending strength | σ | [MPa] | 60 | min. 300 |
| Thermal expansivity coefficient | α30–600 | [10–6K–1] | 2–4 | 7–8 |
| Heat conductivity | λ30–10 | [Wm–1K–1] | 1.2–2.5 | |
| Resistance against sudden chase of temperature | ΔT | [K] | 250 | min. 150 |
| Relative permittivity | εr | [–] | 5 | |
| Al2O3 content | % by weight | 33 | min. 99.5 | |
| Inner electric resistance at 30, 200 and 600 °C | ρv,30 | [Ω.m] | 1010 | |
| ρv,200 | [Ω.m] | 106 | 1012 | |
| ρv,600 | [Ω.m] | 103 | 108 |
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