



Electrical 99% Alumina Ceramic Metallized DBC Substrate
Ceramic substrates for LED
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Electrical 99% Alumina Ceramic Metallized DBC Substrate
1. Thickness of substrate can be thin: 0.25mm,0.28mm,0.45mm,0.5mm,0.635mm,1.0mm,1.5mm, 1.8mm,2.0mm
2. Coating by Cu ,Mo/Mn,Ag, Plate with copper
3. Excellent thermal conductivity
4. High electrical insulation
We are producing every kind of highly qualified metallized ceramics of energy-efficient,long life and eco-friendly. There are a series of serious quality control system to make sure production quality.
Electrical 99% Alumina Ceramic Metallized DBC Substrate
DBC ceramic substrate for electronic heating devices
Direct bonded copper (DBC) substrates are commonly used in power modules, because of their very good thermal conductivity. They are composed of a ceramic tile (commonly alumina) with a sheet of copper bonded to one or both sides by a high-temperature oxidation process (the copper and substrate are heated to a carefully controlled temperature in an atmosphere of nitrogen containing about 30 ppm of oxygen; under these conditions, a copper-oxygen eutectic forms which bonds successfully both to copper and the oxides used as substrates). The top copper layer can be preformed prior to firing or chemically etched using printed circuit board technology to form an electrical circuit, while the bottom copper layer is usually kept plain. The substrate is attached to a heat spreader by soldering the bottom copper layer to it.2.Advantages of DBC ceramic substrate:
high mechanical strength
fine thermal conducticity
excellent electrical isolation
good adhesion
corrosion resistant
high reliability
environmentally clean
Alumina Ceramics Properties | |||
Unit | 95% | 99% | |
Density | g/cm3 | 3.6 | 3.8 |
Water absorption | % | <0.4 | <0.2 |
Firing temperature | °C | 1600 | 1800 |
Hardness | HRA | 70 | 80 |
Coefficientoflinearexpansion | *10-6/°C | 5.5 | 5.3 |
Dielectric constant | 9 | 10.5 | |
Volume resistivity | Ω·cm | — | 1013 |
Breakdownvoltage | KV/mm | 14 | 15 |
Breaking strength | Mpa | 250 | 300 |
Applications of DBC ceramic substrate:
semiconductor refrig-erators
power control circuits
high frequency switch mode power suppliers
solid-state relays
Solar-panel arrays
telecommunications private branch exchange and receiving system
industrial electronics
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