|
|
Al2O3
|
Material |
99%Al2O3 |
95%Al2O3 |
92%Al2O3 |
75%Al2O3 |
|
Material Characteristics |
Density |
g/cm3 |
3.9 |
3.7 |
3.4-3.7 |
3.2-3.4 |
Water Absorption |
% |
< 0.5 |
< 1 |
< 2 |
< 2 |
Sintering Temperature |
°C |
1,800 |
1,650 |
1,620 |
1520-1600 |
Mechanical Characteristics |
Vickers Hardness |
Mo |
12 |
10 |
12 |
10 |
Flexural Strength |
kg/mm2 |
3,000-4,000 |
3,500 |
3,000 |
3,000 |
Compressive Strength |
kg/mm2 |
28,000-30,000 |
25,000-28,000 |
25,000 |
20,000 |
Thermal Characteristics |
Thermal Conductivity |
25°C
W/m·k
300°C |
31.4
15.9 |
|
15-20 |
6-7 |
Max. Use Temperature |
T(C) |
1,600 |
1,000 |
1,600 |
1,350 |
Coefficient of Linear Thermal Expansion |
x10-6°C |
6.4-8.2 |
5.5-7.5 |
7-7.6 |
7.3 |
Melting Temp. |
°C |
1,750 |
1,600 |
1,500 |
1,300 |
Electrical Characteristics |
Dielectric Constant |
(E)1MHz |
9.2-11 |
9.4-9.8 |
9.2 |
8.3-9 |
Dielectric Loss Angle |
tg
1MHz
|
1-1.5 |
2-3.1 |
4 |
5-10 |
Volume Resitivity |
20°C
300°C
500°C |
Ω·cm |
> 1014
>1013
>1012 |
> 1010
|
> 1010
|
> 1010
|
Dielectric Strength |
KV/mm |
25-30 |
17.6-20 |
35 |
25-30 |
|
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