| When components made of technical ceramic still keep their
dimensional stability at high temperatures of application,
then this due to the materials excellent thermal characteristics:
- low expansion coefficient
- high strength up to high temperature (high melting point)
- high thermal shock resistance
- good heat insulation or heat conductivity
- (heat) dimensional stability
Thermal characteristica of Technical Ceramics
| Type |
Designation
|
Mean
linear expansion coefficient |
Heat conductivity |
Max. temperature
for applications |
30 - 100°C
[10-6K-1] |
30 - 600°C
[10-6K-1] |
[Wm-1K-1]
|
[°C]
|
| PSZ |
Partially stabilised
zirconia |
* |
9 - 13 |
1,2 - 3 |
900 - 15003) |
| ATI |
Aluminium titanate |
* |
5,0 |
1,5 - 3 |
900 - 1600 |
| AI2O3 |
Alumina 80 % |
5 - 7 |
6 - 8 |
10 - 16 |
1400 - 1500 |
| AI2O3 |
Alumina 86 % |
5,5 - 7,5 |
6 - 8 |
14 - 24 |
1400 - 1500 |
| AI2O3 |
Alumina 95 % |
5 - 7 |
6 - 8 |
16 - 28 |
1400 - 1500 |
| AI2O3 |
Alumina >99 % |
5 - 7 |
7 - 8 |
19 - 30 |
1400 - 1700 |
| SSN |
Sintered silicon nitride |
* |
2,5 - 3,5 |
15 - 45 |
1750 |
| RBSN |
Reaction bonded silicon nitride |
* |
2,1 - 3 |
4 - 15 |
1100 |
| HPSN |
Hot-pressed silicon nitride |
* |
3,0 - 3,4 |
15 - 40 |
1400 |
| AIN |
Aluminium nitride |
2,5 - 4 |
4,5 - 5 |
100 - 180 |
1750 |
| SSIC |
Sintered silicon carbide |
* |
4 - 4,8 |
40 - 120 |
1400 - 1750 |
| SISIC |
Silicon infiltrated silicon carbide |
* |
4,3 - 4,8 |
110 - 160 |
1380 |
| HPSIC |
Hot-pressed silicon carbide |
* |
3,9 - 4,8 |
80 - 145 |
1700 |
| RSIC |
Recrystallized silicon carbide |
4,2 |
4,8 |
20 |
1600 |
| NSIC |
Nitride bonded silicon carbide |
4,2 |
4,8 |
14 - 15 |
1450 |
Subgroup
as per IEC 672 |
Designation
|
Mean
linear expansion coefficient |
Heat conductivity |
Max. temperature
for applications |
30 - 100°C
[10-6K-1] |
30 - 600°C
[10-6K-1] |
[Wm-1K-1] |
[°C]
|
| C 220 |
Steatite |
7 - 9 |
7 - 9 |
2 - 3 |
* |
| C 221 |
High-frequency steatite2) |
6 - 8 |
7 - 9 |
2 - 3 |
* |
| C 230 |
Special steatite porous |
8 - 10 |
8 - 10 |
1,5 - 2 |
* |
| C 410 |
Cordierite |
1 - 3 |
2 - 4 |
1,5 - 2,5 |
* |
| C 511 |
Porous cordierite ceramic |
3 - 6 |
4 - 6 |
1,3 - 1,8 |
* |
| C 520 |
Porous cordierite ceramic |
1,5 - 3,5 |
2 - 4 |
1,3 - 1,8 |
* |
| C 530 |
Porous cordierite ceramic |
3,5 - 5 |
4 - 6 |
1,4 - 2 |
* |
| C 610 |
Alumino silicate (50-65%
AI2O3) |
5 - 6 |
5 - 7 |
2 - 6 |
* |
| C 620 |
Alumino silicate (65-80%
AI2O3) |
5 - 6 |
5 - 7 |
6 - 15 |
* |
| C 820 |
Magnesia |
8 - 9 |
11 - 13 |
6 - 10 |
* |
|
*value indication not customary |
|
2)in German language sometimes called "special
steatite" |
| 3)special version up to 2400 °C
|
|
| We recommend asking the manufacturer for
his own data, because their are often more appropriate
values available. All materials of technical ceramic can
be classified according to ENV 12212. Data of the charge
is based on manufacturers data. This stated values were
established on specimen as per IEC 672-2, and cannot be
applied to other forms and dimensions. |
.
10. Mai 2005
|
English