Огнеупорное сырье для листового алюминия

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Характеристики


Refractory Raw Material Tabular Alumina for Castable


Tabular Alumina is a high-density, fully shrunk, coarse crystalline alpha-alumina that has been converted to the corundum form. It is a completely crystallized α-alumina sintered at slightly below the melting point of imported alumina after batching, grinding, and molding.


Tabular Alumina is produced by sintering ball-formed alumina at a temperature under the 2040°C fusion point of aluminum oxide. The crystals are arranged in a tabular staggered way, which increases the mechanical strength of the particles.


Tabular alumina has characteristic large, well-developed hexagonal tablet-shaped α-alumina crystals of up to 200μm length.


Tabular Alumina Properties:


  1. Complete crystallization, High purity up to 99.5% Al2O3

  2. Low apparent porosity Less than 5%

  3. Good resistance to alkalis and mineral acids

  4. Water absorption is less than 1%

  5. High hardness and toughness

  6. High thermal conductivity

  7. Excellent thermal shock resistance

  8. Good abrasion resistance.

  9. High volume stability

  10. High anti-bending strength


Typical physical:





















































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



9.0



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



≥ 99.2



MAX. 0.18



≤ 0.1



≤ 0.4



Typical Value



99.45



0.05



0.02



0.32

























Index



Bulk density(g/cm3)



Porosity(%)



Water absorption rate(%)



Guarantee Value



≥ 3.5



≤ 5.0



≤ 1.5



Typical Value



3.56



2.35



0.72



TA03TA04


Particle Size Distribution:





























































































































Size: mm



Distribution



Typical Values %



MAX/MIN %



5-10mm



5-10mm



92



75



7-10mm



58



40



5-7mm



35



20



3-6mm



3-6mm



98



90



4-6mm



55



40



3-4mm



44



20



1-3mm



1-3mm



99



90



2-3mm



52



30



1-2mm



47



30



1-2mm



+2.36mm



8



10



-1mm



5



10



0.5-1mm



0.5-1.18mm



95



90



0.7-1.18mm



45



35



0.5-0.7mm



50



20



0.2-0.6mm



+0.6mm



5



10



-0.2mm



4



10



0-0.5mm



0-0.5mm



95



90



0.15-0.5mm



49



38



-200#



+0.088mm



0.3



3



-0.044mm



96



90



-325#



-0.044mm



97



85



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