99.99 Alumina ceramic - High Purity Alumina Parameters

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99.99 Alumina ceramic

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Nano-alumina has stable crystal phase, high hardness and good dimensional stability, which can be widely used to strengthen and toughen all kinds of plastics, rubber and ceramic products, especially to improve the density, finish, cold and hot fatigue, fracture toughness, creep resistance and wear resistance of polymer products.

The crystal type	The purity (%)≥	Particle size d50(μm)	Specific surface(m2/g)	Apparent density( g/cm3)	impurities
					(ppm)≤
					k	Na	Ca	Mg	Fe	Si	Ti	Cu
γ-AL2O3	99.995	35-45	70-120	0.60-0.70	2	10	3	1	3	10	1	1
α-AL2O3	99.995	45-55	2-10	0.75-0.85	2	10	3	1	3	10	1	1
γ- AL2O3	99.99	0.1-0.6	≥100	0.10-0.18	3	6	8	2	5	15	2	3
α- AL2O3	99.99	0.4-0.8	≥5	0.25-0.32	3	5	7	2	5	15	2	3

Application advantages
1. High purity alumina powder is often used as a medium for color layer analysis.
2. High purity alumina is the reason that metal aluminum is not easy to be corroded in air.Pure aluminum can react easily with oxygen in the air to form a thin film of alumina covering the surface exposed to the aluminum in the air.This layer of alumina film prevents further oxidation of aluminum.The thickness and properties of this oxide film can be enhanced by a process called anodization.
3. Aluminum is a good conductor of electricity and heat, while alumina is an insulator of electricity and heat.Alumina crystal form of corundum due to high hardness, suitable for grinding materials and cutting tools.
4. Emergency brake equipment that can be used for high-speed train (spraying high purity alumina powder on the rail to increase the rail friction)

Product features
Widely used in LED sapphire crystal, aerospace, optical materials, super ceramics, advanced refractory materials, catalyst support and many other high-tech fields.Five characteristics of high purity alumina:
1. Chemical resistance
2. High purity alumina, the content of alumina is more than 99%
3. High temperature resistant, normal use at 1600 ℃, 1800 ℃ in the short term
4. It is resistant to sudden cold and heat and does not crack easily
5. Injection molding is adopted with high density

Item	Unit	99.99 alumina
Alumina content	%	99.99
The density of	g/cm3	3.98
Bibulous rate	%	0
Young's modulus	Gpa	362
Webster's hardness	Gpa	30
The compressive strength	Mpa	2570
Flexural strength	Mpa	320
Thermal conductivity	W/m.k	36-42
Thermal shock resistance	△（℃）	228
Maximum service temperature	℃	1800
Volume resistivity	Ω.cm	＞10∧14
Dielectric constant	-	9.92
Dielectric strength	KV/mm	24

Properties of Alumina/Aluminum Oxide (Al2O3)
1.Very good electrical insulation (1x1014 to 1x1015 Ωcm)
2.Moderate to extremely high mechanical strength (300 to 630 MPa)
3.Very high compressive strength (2,000 to 4,000 MPa)
4.High hardness (15 to 19 GPa)
5.Moderate thermal conductivity (20 to 30 W/mK)
6.High corrosion and wear resistance
7.Good gliding properties
8.Low density (3.75 to 3.9 g/cm3)
9.Operating temperature without mechanical load 1,000 to 1,500°C.
10.Bioinert and food compatible

Products and Aplications
– Pieces, Plates, Boards, Trays, etc. in Alumina-Ceramic / Cordierite-Mullite
– Tubes, Rods, Rollers, Supports, etc. in Alumina-Ceramic / Cordierite-Mullite
– Protection, Thermocouples, Insulation, etc. in Alumina-Ceramic / Cordierite-Mullite
– Pieces, Plates, Tubes, Rods, Rollers, etc. in Zirconium Oxide
– others

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