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Alumina Ceramic Parameters
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Alumina ceramic (Al2O3)

 

 

Alumina ceramic is a ceramic material mainly composed of AL2O3. Used for thick film integrated circuits.

Alumina ceramics have good conductivity; mechanical strength and high temperature resistance. It should be noted that ultrasonic cleaning is required.

Alumina ceramics are a widely used ceramic. Because of its superior performance, it has become more and more widely used in modern society, satisfying the needs of daily use and special performance.
 

 

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 porcelain, 95 porcelain, 90 porcelain, 75 porcelain, 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

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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