Tabular Alumina (TA) is a kind of α-Al2O3 material which is rapidly sintered by high temperature shaft kiln then by rapid cooling. It has the characteristics of low open porosity and large crystals with closed spherical pores which are trapped upon re-crystallization during rapid sintering. Tabular alumina is of high refractoriness, excellent thermal shock resistant, fantastic anti-creeping and anti-stripping performance. As the essential refractory raw material finally applied in iron and steel industry, it is most widely used in the refractory castables ladles, precastings as porous bricks, seating bricks, sliding nozzles, ladle stoppers. As the primary choice of refractory raw materials, it is also widely used in a variety of industries such as foundry, petrochemical, ceramic and incineration.
Properties:
- Complete crystallization, High purity up to 99.5% Al2O3
- Low apparent porosity Less than 5%
- Good resistance to alkalis and mineral acids
- Low water absorption less than 1%
- High hardness and toughness
- High thermal conductivity
- Excellent thermal shock resistance
- Good abrasion resistance.
- High volume stability
- High anti-bending strength
Applications:
Fire bricks
Alumina based refractory bricks
Technical data:
| Typical physical properties | ||||||||
| Specific gravity | 3.96 g/cm3 | |||||||
| Bulk density | 3.45-3.5g/cm3 | |||||||
| Apparent porosity | 2-5% | |||||||
| water absorption rate | 0.7-1.5% | |||||||
| Mohs’ Hardness | 9 | |||||||
| 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 99.2 | max 0.18 | max 0.1 | max 0.4 | ||||
| Typical Value | 99.45 | 0.05 | 0.02 | 0.32 | ||||
| Key Physical Index | ||||||||
| Index | Bulk density(g/cm3) | Porosity(%) | Water absorption rate(%) | |||||
| Guarantee Value | min 3.5 | max 5.0 | max 1.5 | |||||
| Typical Value | 3.56 | 2.35 | 0.72 | |||||
Reviews
There are no reviews yet.