| 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
| For more information about ceramics parts,please contact our engineers in time >>> |
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