Click image to view original picture
Alumina Content: 45% to 95%
Special size for customer
Key Properties
1.Hard, wear-resistant
2.Excellent dielectric properties from DC to GHz frequencies
3.Resists strong acid and alkali attack at elevated temperatures
4.Good thermal conductivity
5.Excellent size and shape capability
6.High strength and stiffness
7. Available in purity ranges from 60% to 99.8% for the most demanding high temperature applications.
Application :The alumina tubes are widely used in thermocouple protections and some are used in furnaces.
Technical indicator
|
Project |
Test the condition |
Unit |
99 porcelain |
95 porcelain |
|
|
Backbone |
99%AL2O3 |
95%AL2O3 |
|||
|
Physical property |
Density of volume |
Normal atmospheric temperature |
g/cm3 |
3.8 |
3.6 |
|
Airtight |
Normal atmospheric temperature |
Pass |
Pass |
||
|
Absorbing water rate |
Normal atmospheric temperature |
% |
0 |
0 |
|
|
Temperature that frit |
°C |
1800 |
1650 |
||
|
Mechanical performance |
Rockwell hardness |
Normal atmospheric temperature |
HRA |
88 |
86 |
|
Resist the intensity of turning back |
Normal atmospheric temperature |
Mpa |
350 |
320 |
|
|
Compression strength |
Normal atmospheric temperature |
Mpa |
1300 |
1200 |
|
|
Hot performance |
Use temperature at most |
°C |
1700 |
1600 |
|
|
Heat resistant shaking |
20O°C-1100O°C |
10Num |
Pass |
Pass |
|
|
Hot coefficient of expansion |
20O°C-80O°C |
×10-6mm/°C |
6.5-8.5 |
6.5-8.0 |
|
|
Heat-conduction rate |
25°C |
W/m.k |
29 |
25 |
|
|
300°C |
W/m.k |
18 |
13 |
||
|
Dielectric constant |
The medium lossing |
1MHz2O°C |
×10-4 |
≤2.5 |
≤4 |
|
The angle tangent is worth |
1MHz8O°C |
×10-4 |
≤3.5 |
≤4.2 |
|
|
Dielectric strength |
Normal atmospheric temperature |
KV/mm |
15 |
16 |
|
|
Dielectric constant |
1MHz2O°C |
9-10.5 |
9-10 |
||
|
Resistivity of volume |
2O°C |
Ω.cm |
>1012 |
>1012 |
|
|
10O°C |
Ω.cm |
1012-1013 |
1012-1013 |
||
|
30O°C |
Ω.cm |
>1012 |
3.1×109 |
||
