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Advantages:
1) Excellent insulation, security, long working life
2) High temperature resistance
3) Resistance to electric breakdown
4) Stand wear and tear
5) High strength
6) Corrosion resistance
7) Good compactnes
8) HIgh hardness
Performance | |||||
Item |
Index |
Unit |
Steatite ceramic |
95 Al2O3 |
96 Al2O3 |
Physical Characteristics |
Bulk density |
g/cm3 |
2.7 |
3.6 |
3.6 |
Water absorption |
% |
0 |
0 |
0 |
|
|
Mechanical Characteristics |
Flexural strength |
Mpa |
145 |
320 |
340 |
Hardness Vickers |
Gpa |
5.7 |
12.2 |
13.5 |
|
Elastic modulus |
Gpa |
120 |
280 |
320 |
|
Poisson’s ratio |
- |
0.21 |
0.22 |
0.23 |
|
Thermal Characteristics |
Linear expansion coefficient |
20-5000C 10-6/0C |
7.9 |
7.1 |
7.2 |
Thermal conductivity |
w/(m.k) |
2.5 |
16 |
24 |
|
Specific Heat |
*10-3J/(kg*K) |
0.75 |
0.78 |
0.78 |
|
Electrical Characteristics |
Dielectric constant(1MHZ) |
- |
6.2 |
9 |
9.4 |
Dielectric loss angle |
*10-4 |
18 |
15 |
5 |
|
Dielectric strength |
*106V/m |
18 |
12 |
15 |
|
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