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 Product name：Physical properties and chemical composition of ceramic materials |
|
Item/Unit/Material Mark
|
95 aluminum oxide
(A-95)
|
80 aluminum oxide
(A-80)
|
75 aluminum oxide
(A-75)
|
Steatite ceramics
SM-1
|
|
Volume density |
g/cm3 |
3.6 |
3.3 |
3.2 |
2.7 |
|
Rupture strength |
Mpa |
290 |
280 |
260 |
150 |
Coefficient of linear expansion
(20-100℃) |
x10-6/℃ |
6.5 |
5.3 |
5.3 |
8 |
Dielectric constant
(1MHz 20℃) |
|
9.6 |
8.5 |
8.0 |
7.5 |
Medium wearing factor
(1MHz 20℃) |
x10-4 |
4.5 |
8 |
10 |
8 |
|
Volume resistivity 100℃ |
Ω·cm |
1014 |
1013 |
1013 |
1012 |
|
Disruptive strength |
Kv/mm |
25 |
25 |
20 |
20 |
|
AL2O3 content |
% |
95.9 |
80.7 |
77.0 |
4.5 |
|
SiO2 content |
% |
2.22 |
13.0 |
13.0 |
58 |
|
MgO content |
% |
1.2 |
1.4 |
3.4 |
28 |
|
BaO content |
% |
|
1.8 |
2.4 |
8.2 |
|
CaO content |
% |
0.28 |
2.5 |
3.4 |
0.23 |
|
Fe2O3 content |
% |
0.08 |
0.2 |
0.3 |
0.75 |
|
K2O content |
% |
0.1 |
0.1 |
0.1 |
0.1 |
|
Na2O content |
0.2 |
0.2 |
0.2 |
0.2 |
0.2 |
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