Performance indicators of structural ceramics for electronic components |
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Serial number |
project |
Test Conditions |
Units and symbols |
Ceramic material |
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Talc porcelain |
75% Al2O3 porcelain |
90% Al2O3 porcelain |
95% Al2O3 porcelain |
99% Al2O3 porcelain |
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1 |
Bulk density |
|
g/cm3 |
>2.70 |
>3.20 |
>3.40 |
>3.60 |
>3.70 |
2 |
Flexural strength |
|
kgf/cm3 |
1400 |
2000 |
2300 |
2800 |
3000 |
3 |
Linear expansion coefficient |
20~100℃ |
×10-6mm/℃ |
≤8 |
≤6 |
- |
- |
- |
20~500℃ |
×10-6mm/℃ |
- |
- |
6.3~6.7 |
6.5~7.5 |
6.5~7.5 |
||
20~800℃ |
×10-6mm/℃ |
- |
- |
6.3~6.7 |
6.5~8 |
6.5~8 |
||
4 |
Thermal Conductivity |
|
cal/cm·s·℃ |
- |
- |
- |
- |
- |
5 |
Dielectric coefficient |
1MHz 20℃ |
|
≤7.5 |
<9 |
9~10 |
9~10 |
9~10.5 |
500℃ |
|
- |
- |
- |
9~10 |
- |
||
10GHz 20℃ |
|
- |
- |
9~10 |
9~10 |
9~10.5 |
||
6 |
Dielectric loss tangent |
1MHz 20℃ |
×10-4 |
≤8 |
≤10 |
≤6 |
≤4 |
≤2.5 |
500℃ |
×10-4 |
- |
- |
- |
30~40 |
- |
||
10GHz 20℃ |
×10-4 |
- |
- |
- |
≤10 |
≤6 |
||
7 |
Volume resistivity |
100℃ |
Ω·cm |
>1012 |
>1012 |
>1013 |
>1013 |
>1013 |
300℃ |
Ω·cm |
- |
- |
>1010 |
>1010 |
>1010 |
||
500℃ |
Ω·cm |
- |
- |
- |
>108 |
>109 |
||
8 |
Breakdown strength |
|
kV/mm |
20 |
20 |
15 |
15 |
15 |
9 |
Chemical stability |
1:9HCL |
mg/cm2 |
- |
- |
- |
≤7.5 |
≤0.7 |
10%NaOH |
mg/cm2 |
- |
- |
- |
≤0.2 |
≤0.1 |
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10 |
Porosity |
|
% |
- |
- |
- |
- |
- |