1.Performance Requirements of Alumina Ceramic Plate:
(1) Mechanical properties
It has high enough mechanical strength, in addition to carrying components, it can also be used as a supporting member; it has good processability and high dimensional accuracy; it is easy to realize multilayer;
The surface is smooth, without warpage, bending, microcracks, etc.
(2) Electrical properties
High insulation resistance and insulation breakdown voltage;
Low dielectric constant;
Low dielectric loss;
Stable performance under high temperature and high humidity conditions to ensure reliability.
(3) Thermal properties
High thermal conductivity;
The thermal expansion coefficient is matched with the related material (especially the thermal expansion coefficient of Si should be matched);
Excellent heat resistance.
(4) Other properties
Good chemical stability; easy to metallize, strong adhesion to the circuit pattern;
No hygroscopicity; oil and chemical resistance; a-ray emission is small;
The materials used are pollution-free and non-toxic; the crystal structure does not change within the operating temperature range;
Abundant raw materials; mature technology; easy manufacturing; low price.
2. Application of Alumina Ceramic Plate:
(1). High-power power semiconductor modules; semiconductor refrigerators, electronic heaters; power control circuits, power mixing circuits.
(2). Intelligent power components; high-frequency switching power supplies, solid state relays.
(3). Automotive electronics, aerospace and military electronic components.
(4). Solar panel components; telecommunications dedicated switches, receiving systems; industrial electronics such as lasers.
3. Typical properties for common materials of Alumina Ceramic Plate:
|
ITEM |
Unit |
Al203 |
||||||
|
AS970 |
HA-96-2 |
HBS |
HRA |
HA-996 |
||||
|
Material |
- |
- |
96.5% |
96% |
96.5% |
96% |
99.6% |
|
|
Color |
- |
- |
White |
White |
White |
White |
White |
|
|
Density |
- |
g/㎤ |
3.74 |
3.75 |
3.75 |
3.60 |
3.90 |
|
|
Surface Roughness(Ra) |
- |
µm |
0.4 |
0.4 |
0.3 |
0.3 |
0.1 |
|
|
Luminous Reflectance |
0.3-0.4mmt |
% |
70 |
70 |
70 |
85 |
75 |
|
|
0.8-1.0mmt |
80 |
80 |
80 |
95 |
85 |
|||
|
Physical Property |
Breaking Strength |
Three-point bending |
MPa |
450 |
400 |
500 |
370 |
470 |
|
Modulus of Elasticity |
- |
GPa |
330 |
330 |
330 |
- |
330 |
|
|
Vickers Hardness |
- |
GPa |
14 |
14 |
14 |
- |
16 |
|
|
Fracture Toughness |
IF |
MPa･m1/2 |
3.0 |
3.0 |
- |
- |
- |
|
|
Thermal Property |
Thermal Expansivity |
40-400°C |
10-6/K |
6.7 |
6.7 |
6.7 |
6.7 |
6.8 |
|
40-800°C |
7.8 |
7.8 |
7.8 |
7.8 |
7.9 |
|||
|
Thermal Conductivity |
25°C |
W/(m･K) |
24 |
24 |
24 |
20 |
29 |
|
|
300°C |
12 |
12 |
12 |
- |
13 |
|||
|
Specific Heat |
25°C |
J/(㎏･K) |
750 |
750 |
750 |
750 |
780 |
|
|
Electric Property |
Dielectric Constant |
1MHz |
- |
9.8 |
9.8 |
9.8 |
- |
9.9 |
|
Dielectric Loss |
1MHz |
10-3 |
0.2 |
0.2 |
0.2 |
- |
0.05 |
|
|
Volume Resistance |
25°C |
Ω･㎝ |
>1014 |
>1014 |
>1014 |
>1014 |
>1014 |
|
|
Breakdown Voltage |
DC |
㎸/㎜ |
>15 |
>15 |
>15 |
>15 |
>15 |
|
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