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Alumina Ceramic Parameters
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Alumina ceramic (Al2O3) -- Aluminium oxide ceramics

Alumina ceramic, Al2O3 aluminium oxide ceramics is an advance ceramic materials which used for the industry.It has excellent material properties over metal.
Aluminum oxide ceramics is very hard and resistant to wear, providing high compressive strength even in extreme temperatures and corrosive environments.Alumina is also an excellent electrical insulator and gas tight.

Typical Alumina property include:
Good strength and stiffness
Good hardness and wear resistance
Good corrosion resistance
Good thermal stability
Excellent dielectric properties (from DC to GHz frequencies)
Low dielectric constant
Low loss tangent

Alumina ceramic composition(Al2O3 purity 95% to 99.99%):

High purity alumina ceramics
99.99% Alumina ceramic; 99.9% Alumina ceramic,
Ordinary alumina ceramics
99.7% Alumina ceramic,99.5% Alumina ceramic,99% Alumina ceramic,97% Alumina ceramic,96% Alumina ceramic,95% Alumina ceramic

Note: different industries, different environments, different equipment, different products have different requirements on the composition of alumina, different alumina ceramic components have different performance and service life.


Alumina ceramics are currently classified into high-purity and ordinary types. High-purity alumina ceramics are ceramic materials with Al2O3 content above 99.9%; due to their sintering temperature as high as 1650-1990 ° C, the transmission wavelength is 1 ~ 6 & mu; m, generally made of molten glass to replace platinum crucible; Translucent and alkali-resistant metal corrosion are used as sodium lamps;

they can be used as integrated circuit substrates and high-frequency insulation materials in the electronics industry. Ordinary alumina ceramics are classified into 99
alumina ceramics, 95% alumina ceramics, 90 alumina ceramics, 75alumina ceramics, etc. according to the content of Al2O3. Sometimes the Al2O3 content is 80%; or 75% is also classified as ordinary alumina ceramic series.

Alumina Ceramic Parameters
Properties Unit Alumina (AL2O3)
AL2O3≥95 AL2O3≥99 AL2O3≥99.5 AL2O3≥99.8
Volumetric density g/cm3 3.7 3.80-3.85 3.85 3.9
Hardness HRA≥ 86 88 88 88
Flexural Strength Mpa≥ 300 350 400 400
Maximum temperature 1500 1500 1500 1500
Line expansion coefficient ×10-6/℃ 7.5 8.2 8.2 8.2
Dielectric constant εr(20℃,1MHz) 9 9.2 9.2 9.2
Media loss tanδ×10-4,1MHz 3 2 2 2
Volumetric resistivity Ω·cm(20℃) 1013 1014 1014 1014
Breakdown strength KV/mm,DC≥ 20 20 20 20
Acidic resistance mg/cm2≤ 0.7 0.7 0.7 0.7
Alkaline resistance mg/cm2≤ 0.2 0.1 0.1 0.1
Abrasion resistance g/cm2≤ 0.2 0.1 0.1 0.1
Compressive strength Mpa≥ 2500 2500 2500 2800
Flexural Strength Mpa≥ 200 350 350 350
Thermalcoefficient W/m·K(20℃) 20 25 25 25
Note: The above table is made by Mingrui ceramic manufacturer, the table is part of the parameters of alumina ceramics, All specific alumina ceramic parameters, please contact us.our officials E-mail: admin@cerampart.com

Properties of Alumina/Aluminum Oxide (Al2O3)
1.Very good electrical insulation (1x10^14 to 1x10^15 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

The composition types of Alumina ceramic

Alumina(Al2O3)95%; 97%; 98%; 99%; 99.5%: 99.7%; 99.8%; 99.9%; 99.99%...

Catalyst support:

Alumina Al2O3 has been used as the carrier of platinum, palladium, cobalt, manganese, iron, nickel, vanadium and other compounds, forming oxidation-reduction and acid-base catalysis.

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