Low-Sodium Tabular Aluminum Oxide
Low-sodium tabular aluminum oxide is a pure, fully developed sintered aluminum oxide without any additives such as MgO, B2O3, etc. It has a low sodium content, complete shrinkage, large crystal particles, and well-developed α-Al2O3 crystal structure. Low-sodium tabular aluminum oxide has higher aluminum oxide purity, bulk density and lower porosity and water absorption than ordinary tabular aluminum oxide.
Properties:
- Low sodium content (not higher than 0.2%)
- High purity, aluminum oxide content is not less than 99.3%
- Large crystal particles, high crystal strength
- Bulk density is higher than ordinary sintered aluminum oxide
- Significant low porosity
- Low water absorption
- Good thermal shock resistance
- Low thermal conductivity, good insulation performance
- High toughness
Applications:
Refractory products made of low-sodium tabular aluminum oxide have good corrosion resistance, erosion resistance, thermal shock resistance, peeling resistance, etc., and are suitable for various fields in the refractory industry. In addition, it is also widely used in high temperature industries such as metallurgy, industrial ceramics, thermal conductive materials, and building materials.
Technical data:
Typical physical properties | ||||||||
Specific gravity | 3.96 g/cm3 | |||||||
Bulk density | 3.55-3.6g/cm3 | |||||||
Apparent porosity | 2-3% | |||||||
water absorption rate | 0.7-1.2% | |||||||
Mohs’ Hardness | 9.0 | |||||||
Knoop hardness | 2000kg/cm3 | |||||||
Thermal conductivity | (100℃)0.069 cal/sec cm℃ | |||||||
Heat capacity | (20℃)0.21cal/gm/(100℃) | |||||||
Melting temperature | 2050℃ | |||||||
Max. service temperature | min 1800℃ | |||||||
Refractive Index | 1.76 | |||||||
Appearance | White granules or powder | |||||||
Chemical composition（%） | ||||||||
Index | AL2O3 | SiO2 | Fe2O3 | Na2O | ||||
Guarantee Value | min 99.3 | max 0.18 | max 0.1 | max 0.2 | ||||
Typical Value | 99.58 | 0.06 | 0.02 | 0.18 | ||||
Key Physical Index | ||||||||
Index | Bulk density(g/cm3) | Porosity(%) | Water absorption rate(%) | |||||
Guarantee Value | min 3.55 | max 3.0 | max 1.2 | |||||
Typical Value | 3.61 | 2.05 | 0.68 | |||||
Granule Specification (mm) :
Fraction | 0-30mm,30-10mm,12-6mm,10-8mm,8-5mm,5-3mm,3-1mm,2-1mm,1-0mm,1-0.5mm,0.5-0.2mm,0.5-0mm,0.3-0mm |
Fine | 46mesh-0,60mesh-0,80mesh-0,100mesh-0,120mesh-0,150mesh-0,180mesh-0,200mesh-0,240mesh-0,270mesh-0 |
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