White Sintered Tabular Alumina

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

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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

Specification

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
1-2mm	-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
0.2-0.6mm	-0.2mm	4	10
0-0.5mm	0-0.5mm	95	90
0-0.5mm	0.15-0.5mm	49	38
-200#	+0.088mm	0.3	3
-200#	-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

White Sintered Tabular Alumina

Characteristic:

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