High temperature industrial alumina ceramic roller
Material:Al2O3 ceramic
Working temperature:1600C.
Good chemical resistant
High temperature industrial alumina ceramic roller
Material: Alumina ceramic
1. Heat treatment furnace and toughened furnace
2. Inner liner tube and heating tube in electric furnace
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
| 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 | |
| Chill and abrupt heat | 1500ºC~room temperature not cracking thrice. | |
| Material | 65 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:°C | 1300 °C | 1400 °C | 1450 °C | 1580 °C | 1600 °C | 1650 °C | 1800°C |
| 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 |
