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Thermal Properties for Alumina Heater | ||||
Item | Unit | Value | ||
Max. Working Temperature | ℃ | 900 | ||
Working Temperature | ℃ | 850 | ||
Thermal Conductivity | W/(m·k) | 21 | ||
Specific Heat | J/(kg·k) | 0.78x103 | ||
Expansion | /℃ (40~800℃) | 0.78x10-6 | ||
Hardness | Gpa | 13.5 | ||
Flexural | Mpa | 320 |
Properties of 95% Al2O3 Material | ||||||
Property | Testing Condition | Unit | Value | |||
Color | White | |||||
Bulk Density | g/cm3 | 3.7 | ||||
Water Absorption Capacity | % | 0 | ||||
Medium Grain Size | um | 3-5 | ||||
Hardness | Load 4.9N | Gpa | ≥15 | |||
Bending Strength | Mpa | ≥274 | ||||
20 ~ 500℃ | 1x10-6mm/℃ | 6.5~7.5 | ||||
20 ~ 800℃ | 6.5~8.0 | |||||
Specifit Heat | 20℃ | W/(M.K) | ≥20.9 | |||
Dielectric Strength | KV/mm | ≥12 | ||||
Volume Resistivity | 20℃ | Ohm.cm | ≥1014 | |||
300℃ | ≥1011 | |||||
500℃ | ≥109 | |||||
Delectric Constant | 1MHZ | 9~10 | ||||
Dieletric Loss | 1MHZ | ≤3x10-4 | ||||
Surface Roughness | um | 0.3um |