White Sintered Tabular Alumina

  • White Sintered Tabular Alumina

Product Description And Parameters

tabular alumina 99.3%

Product description: sintered Tabular alumina 99.3% AL2O3 IN refractory and foundry industry

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

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
9.0
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 99.2
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
Paritcal 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
Available Sizes
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
Customized size is available upon request

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