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The size ranges from
2mm to 110mm for O.D.,
and the length is from
1mm to 1750mm
|
Serial number |
performance index |
Measuring unit |
High purity alumina |
Alumina |
High alumina |
|
1 |
Al2O3 |
% |
99.7 |
99.3 |
85 |
|
2 |
SiO2 |
% |
less than0.1 |
— |
— |
|
3 |
Density |
g/cm3 |
3.95 |
3.88 |
3.2 |
|
4 |
Wter absorption |
% |
0 |
0.01 |
0.2 |
|
5 |
Cld compressive strength |
MPa |
450 |
350 |
200 |
|
6 |
20 degree Celsius leak rates |
Torr/L.sec |
less than10-11 |
less than10-11 |
less than10-11 |
|
7 |
Twisting in high temperature |
mm |
1700 degree Celsius 0.2 allowance |
1600 degree Celsius 0.2 allowance |
1400 degree Celsius 0.2 allowance |
|
8 |
Bonding in high temperature |
1700 degree Celsius non-caked |
1600 degree Celsius non-caked |
1400 degree Celsius non-caked |
|
|
9 |
20—1000 degree Celsius coefficient of thermal expansion |
mm.10-6/degree Celsius.m |
8.6 |
8.2 |
8.2 |
|
10 |
Thermal conductivity |
W/m.k |
25 |
25 |
25 |
|
11 |
Electric insulation strength |
KV/mm |
20 |
20 |
15 |
|
12 |
20 degree Celsius direct current insulating resistance |
Ohm/cm |
1014 |
1014 |
1014 |
|
13 |
High-temperature insulation resistance |
1000 degree Celsius MΩ |
≥0.08 |
≥0.08 |
≥0.08 |
|
1300 degree Celsius MΩ |
≥0.02 |
≥0.02 |
≥0.02 |
||
|
14 |
Thermal shock resistance |
1550 degree Celsius 6 times not cracked |
1550 degree Celsius 6 times not cracked |
1300 degree Celsius 3 times not cracked |
|
|
15 |
Maximum service temperature |
degree Celsius |
1900 |
1800 |
1400 |
