High temperature furnace Al2O3 alumina ceramic Tube
Material: Alumina ceramic
Mainly Usage:
1. Heat treatment furnace and toughened furnace
2. Inner liner tube and heating tube in electric furnace
Features:
1.Great mechanical strength
2.High softening temperature
3.Good resistance to thermal impact
4.Small thermal expansion coefficient
5.Good chill and abrupt heat properties
6. Resistance to acid and alkali corrosion
Material | 70 Al2o3 | 75 Al2o3 | 80 Al2o3 | 85 Al2o3 | 90 Al2o3 | 95 Al2o3 | 99 Al2o3 |
Al2o3 | 65% | 75% | 80% | 85% | 90% | 93% | 99.3% |
Fe2o3 | ≤ 4 | ≤ 2 | ≤ 1.5 | ≤ 1.0 | ≤ 0.5 | ≤ 0.5 | ≤ 0.3 |
Desnsity:g / cm3 | 2.8 | 3.10 | 3.20 | 3.40 | 3.50 | 3.60 | 3.85 |
Vickers Hardness | 7.5 | ≤ 7.8 | ≥ 8 | ≥ 8.6 | ≥ 8.8 | 9 | 9 |
Water Absorption:% | ≤ 4 | ≤ 1 | ≤ 0.5 | ≤ 0.2 | ≤ 0.1 | ≤ 0.085 | ≤ 0.01 |
Refractoriness:℃ | 1300 ℃ | 1400 ℃ | 1450 ℃ | 1580 ℃ | 1600 ℃ | 1650 ℃ | 1800℃ |
Flexural Strength:Mpa | 80 | 100 | 150 | 180 | 200 | 240 | 280 |
Wear Rate( at room temperature, erosion, 100 grinding)% | ≤ 5 | ≤ 4.5 | ≤ 3.5 | ≤ 3 | ≤ 2.5 | ≤ 1 | ≤ 0.5 |
Chemical competent | Al2O3 | ≥99.5% |
SiO2 | <0.2% | |
Fe2O3 | <0.1% | |
Alkaline matter | <0.1% | |
Density | 3.9 g/cm3 | |
Hardness | 9 M | |
Water absorption | <0.1% | |
Ruptures trength | >2000kg/cm2 | |
Gas tightness | Kept for ten minutes at negative pressure of 1.3Kpa. The pressure drop is less than 0.3Kpa. | |
Thermal tolerance | Insert the pipe into the furnace at a depth of 20mm. Heat to 1600ºC and maintain for 30 minutes. | |
Alkali tolerance | In the Na2CO3 solution of 2N concentration, boil for 15 hours with the weight loss not greater than 20mg/dm2. | |
Volume resistance | >9*10(5) Ω·cm/1600ºC | |
Breakdown voltage | 20kv/cm | |
Expansion coefficient | 8*10(-8) | |
Temperature for use | Long-term: 1600ºC Short-term: 1800ºC | |
