96% High Aluminum Oxide PCB Board Al2O3 Alumina Ceramic Sheet
Ceramic sheets have outstanding thermal and dielectric properties. These are essential to today's semiconductors industry. Typical ceramic substrates are generally made out of alumina (Al2O3) or aluminum nitride (AlN).
Alumina ceramic is the most common substrate material you'll find in today's ceramic PCBs (printed circuit boards). It boasts an excellent balance of thermal and electrical conductivity when compared to other oxide ceramic substrates.
The alumina ceramic sheet is also reputed for better mechanical strength and chemical stability and is readily available. These properties make it the ideal option for technical manufacturing, especially when various shapes have to be considered.
We can make various specifications. The table below shows our standard sizes.
| 96% Alumina Ceramic Sheet |
| Thickness (mm) |
Maximum Size (mm) |
Shape |
Forming Method |
| As Fired |
Lapped |
Polished |
Rectangular |
Square |
Round |
| 0.25 |
120 |
114.3 |
114.3 |
|
√ |
|
Tape Casting |
| 0.3 |
120 |
114.3 |
114.3 |
|
√ |
|
Tape Casting |
| 0.38 |
140×190 |
|
|
√ |
|
|
Tape Casting |
| 0.5 |
140×190 |
|
|
√ |
|
|
Tape Casting |
| 0.635 |
140×190 |
|
|
√ |
|
|
Tape Casting |
| 0.76 |
130×140 |
|
|
√ |
|
|
Tape Casting |
| 0.8 |
130×140 |
|
|
√ |
|
|
Tape Casting |
| 0.89 |
130×140 |
|
|
√ |
|
|
Tape Casting |
| 1 |
280×240 |
|
|
√ |
|
|
Tape Casting |
| 1.5 |
165×210 |
|
|
√ |
|
|
Tape Casting |
| 2 |
500×500 |
|
|
√ |
|
|
Tape Casting |
| Other special thicknesses within the thickness range of 0.1-2.0mm can be achieved by lapping. |
1. Product Tolerances
| 96% Alumina Ceramic Sheet |
| Item |
Substrate Thickness (mm) |
Standard Tolerance (mm) |
Best Tolerance (mm) |
Laser Cutting Tolerance (mm) |
| Length and Width Tolerance |
/ |
±2 |
|
±0.15 |
| Thickness Tolerance |
T<0.3 |
±0.03 |
±0.01 |
|
| 0.30-1.0 |
±0.05 |
±0.01 |
|
| T>1.0 |
±10% |
±0.01 |
|
2. Surface Roughness
| 96% Alumina Ceramic Sheet |
| Surface Roughness (μm) |
| As Fired |
Lapped |
Polished |
| Ra 0.2-0.75 |
Ra 0.3-0.7 |
Ra ≤0.05 |
3. Laser Processing
(1) Hole Size
| 96% Alumina Ceramic Sheet |
| Hole Diameter (mm) |
Standard Tolerance (mm) |
| φ≤0.5 |
0.08 |
| φ>0.5 |
0.2 |
(2) Laser Scribing
| 96% Alumina Ceramic Sheet |
| Substrate Thickness (mm) |
the Percentage of
Laser Scribe Line Depth
to Thickness (%) |
| 0.2-0.3 |
40%±5% |
| 0.3<T≤0.5 |
50%±3% |
| 0.5<T≤1.0 |
43%±3% |
| 1.2 |
55%±3% |
| 1.5 |
55%±3% |
| 2.0 |
55%+10% |
| The scribing spot can be in different sizes. Generally there are small spot 0.03-0.04mm (Substrate Thickness≤0.5mm ) and large spot 0.08-0.1mm (Substrate Thickness>0.5mm), and the accuracy is ±0.01mm. |
| 96% Alumina Ceramic Sheet |
| Item |
Unit |
96% Al2O3 |
| Mechanical Properties |
| Color |
/ |
/ |
White |
| Density |
Drainage Method |
g/cm3 |
≥3.70 |
| Light Reflectivity |
400nm/1mm |
% |
94 |
| Flexural Strength |
Three Point Bending |
MPa |
>350 |
| Fracture Toughness |
Indentation Method |
MPa·m1/2 |
3.0 |
| Vickers Hardness |
Load 4.9N |
GPa |
14 |
| Young's Modulus |
Stretching Method |
GPa |
340 |
| Water Absorption |
|
% |
0 |
| Camber |
/ |
Length‰ |
T≤0.3: ≤5‰, Others: ≤3‰ |
| Thermal Properties |
| Max. Service Temperature (Non-loading) |
/ |
ºC |
1200 |
CTE (Coefficient of
Thermal Expansion) |
20-800ºC |
1×10-6/ºC |
7.8 |
| Thermal Conductivity |
25ºC |
W/m·K |
>24 |
| Thermal Shock Resistance |
800ºC |
≥10 Times |
No Crack |
| Specific Heat |
25ºC |
J/kg·k |
750 |
| Electrical Properties |
| Dielectric Constant |
25ºC, 1MHz |
/ |
9.4 |
| Dielectric Loss Angle |
25ºC, 1MHz |
×10-4 |
≤3 |
| Volume Resistivity |
25ºC |
Ω·cm |
≥1014 |
| Dielectric Strength |
DC |
KV/mm |
≥15 |
We have been making ceramic substrates for more than 15 years. We can meet your various customized requirements, and our products have high dimensional accuracy and excellent performance. Please feel free to contact us.
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