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Alumina Disk,mainly used in the production of industrial ceramics,such as textiles and ceramics.99 porcelain is mainly used in the production casing Tancifaxin take over the seat of electronic products such as ceramics plates.
Alumina Disk specifications
AL2O3 |
99% |
MgO |
0.8% |
Na2O |
<0.15% |
SiO2 |
<0.018% |
Y2O3 |
<0.02% |
Fe2O3 |
<0.02% |
TiO2 |
<0.006% |
CaO |
<0.005% |
Specifications of Alumina Disk
Items |
Test condition |
Unit |
|
Average grain size |
µm |
3 - 5 |
|
Density |
g/cm3 |
≥3.85 |
|
Water absorption |
% |
0 |
|
Hardness (Vickers) |
HV0.5 |
≥1900 |
|
Flexual strength |
Distance between bending points 80mm |
MPa |
≥340 |
Compressing strength |
MPa |
3600 |
|
Linear thermal expanding coefficient |
20-500℃ |
1x106 mm/℃ |
6.5 – 7.5 |
20-800℃ |
6.5 - 8.0 |
||
Thermal conductivity |
20℃ |
W/(m.K) |
≥24 |
Dielectric strength |
KV/mm |
≥12 |
|
Volume resistivity |
300℃ |
Ω.cm |
≥1011 |
Dielectric constant |
1MHz |
9.3-10.6 |
|
Dielectric loss |
1MHz |
3x10-4 |
|
Thermal shock resistance |
850℃ |
times |
≥7 |