| Application: | Aerospace, Electronics, Medical, Refractory, Industrial Ceramic |
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| Process: | Direct Bonded Copper |
| Dielectric Loss: | 0.0003 |
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1. DBC ceramic substrate:
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.
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 Advantages of DBC ceramic substrate: >high mechanical strength >fine thermal conducticity >excellent electrical isolation >good adhesion >corrosion resistant >high reliability >environmentally clean |
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Alumina Ceramics Properties
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Unit
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95%
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99%
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Density
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g/cm3
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3.6
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3.8
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Water absorption
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%
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<0.4
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<0.2
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Firing temperature
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°C
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1600
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1800
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Hardness
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HRA
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70
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80
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Coefficientoflinearexpansion
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*10-6/°C
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5.5
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5.3
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Dielectric constant
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9
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10.5
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Volume resistivity
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Ω·cm
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-
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1013
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Breakdownvoltage
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KV/mm
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14
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15
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Breaking strength
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Mpa
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250
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300
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