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By certification 
Alumina Shaft 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 Shaft
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? |
O.cm |
=1011 |
Dielectric constant |
1MHz |
9.3-10.6 |
|
Dielectric loss |
1MHz |
3x10-4 |
|
Thermal shock resistance |
850? |
times |
=7 |
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