Product detail
White Sintered Tabular Alumina
Tabular alumina is is high-density, fully shrunk, coarse crystalline alpha alumina that has been converted to the corundum form. It is a completely recrystallized 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℃ 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.
Characteristic:
1. Complete crystallization, High purity up to 99.5% Al2O3
2. Good resistance to alkalis and mineral acids
3. Low water absorption less than 1%
4. High hardness and toughness
5. High thermal conductivity
6. Excellent thermal shock resistance
7. Good abrasion resistance.
8. High volume stability
9. High anti-bending strength
Product Parameters
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Typical physical properties
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Specific gravity
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3.96 g/cm3
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Bulk density
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3.45-3.5g/cm3
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Apparent porosity
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2-5%
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water absorption rate
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0.7-1.5%
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Mohs’ Hardness
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9.0
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Knoop hardness
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2000kg/cm3
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Thermal conductivity
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(100℃)0.069 cal/sec cm℃
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Heat capacity
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(20℃)0.21cal/gm/(100℃)
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Melting temperature
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2050℃
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Max. service temperature
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min 1800℃
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Refractive Index
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1.76
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Appearance
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White granules or powder
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Chemical composition（%）
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Index
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AL2O3
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SiO2
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Fe2O3
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Na2O
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Guarantee Value
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min 99.2
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max 0.18
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max 0.1
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max 0.4
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Typical Value
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99.45
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0.05
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0.02
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0.32
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Key Physical Index
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Index
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Bulk density(g/cm3)
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Porosity(%)
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Water absorption rate(%)
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Guarantee Value
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min 3.5
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max 5.0
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max 1.5
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Typical Value
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3.56
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2.35
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0.72
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Paritcal Size Distribution
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Size:mm
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Distribution
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Typical Values %
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MAX/MIN %
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5-10mm
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5-10mm
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92
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75
|
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7-10mm
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58
|
40
|
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5-7mm
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35
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20
|
|
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3-6mm
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3-6mm
|
98
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90
|
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4-6mm
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55
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40
|
|
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3-4mm
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44
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20
|
|
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1-3mm
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1-3mm
|
99
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90
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2-3mm
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52
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30
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1-2mm
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47
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30
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1-2mm
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+2.36mm
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8
|
10
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-1mm
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5
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10
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0.5-1mm
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0.5-1.18mm
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95
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90
|
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0.7-1.18mm
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45
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35
|
|
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0.5-0.7mm
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50
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20
|
|
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0.2-0.6mm
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+0.6mm
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5
|
10
|
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-0.2mm
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4
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10
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|
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0-0.5mm
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0-0.5mm
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95
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90
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0.15-0.5mm
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49
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38
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-200#
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+0.088mm
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0.3
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3
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-0.044mm
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96
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90
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-325#
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-0.044mm
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97
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85
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Available Sizes
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Fraction
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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
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Fine
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46mesh-0,60mesh-0,80mesh-0,100mesh-0,120mesh-0,150mesh-0,180mesh-0,200mesh-0,240mesh-0,270mesh-0
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Customized size is available upon request
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