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1. Product details
High purity Alumina Ceramic Tubes for thermocouple
The alumina ceramic tubes are mainly used for the protection of the temperature sensor, make the temperature sensor is isolated from the outside , to decrease or prevent components from erosion, oxidation and clash during the Production process.
Features:1) Made of alumina ceramic material 2) Fired through high temperature 3) Progress: grind, polish4) High intension5) Solid-resist 6) Alkali-resist 7) Un-knit and velvet surface 8) Good airproof capability 9) Good grind-resist capability
Performance index | ||||||||
AL2O3 Purity % | 60 | 75 | 80 | 85 | 92 | 95 | 99 | 99.7 |
Volume density(g/cm3) | 3.0 | 3.1 | 3.3 | 3.4 | 3.6 | 3.7 | 3.81 | 3.85 |
Flexural strength(MPa) | 205 | 280 | 215.7 | 230 | 312 | 304 | 340 | 370 |
Expansion coefficient(×10-6/°C)(25-800°C) | 7.1 | 7.6 | 7.6 | 7.6 | 7.5 | 7.3 | 7.6 | 7.6 |
Thermal conductivity[w/(m.R)] | 16 | 17 | 17 | 17 | 18 | 20 | 34 | 35 |
Insulation intensity(KV/mm) | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
Volume resistivity(Ω.cm)20°C | ≥1014 | ≥1014 | ≥1014 | ≥1014 | ≥1014 | ≥1014 | ≥1014 | ≥1014 |
300°C | ≥1013 | ≥1013 | ≥1013 | ≥1013 | ≥1013 | ≥1012 | ≥1010 | ≥1010 |
Long-use temperature (°C) | 1350 | 1000 | 1250 | 1290 | 1390 | 1480 | 1600 | 1700 |
Moh’s hardness | 7.5 | 7.5 | 7.5 | 7.5 | 8.5 | 8.8 | 9 | 9 |
Refractoriness | 1800 | 1700 | 1800 | 1850 | 1920 | 2000 | 2030 | 2040 |