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Automotive engineering
– Lighting systems

AUTOMOTIVE ENGINEERING // FLOW CONTROL IN VEHICLE MANUFACTURING // BODY CONSTRUCTION // COMBUSTION ENGINE // ELECTROMOBILITY // FILLING LEVEL MEASUREMENT // EXHAUST TRAIN // DRIVE // BRAKE SYSTEM // DISTANCE SENSOR // ABS MODULATOR // LIGHTING SYSTEMS // ELECTRONIC CIRCUITS // LIGHTWEIGHT ENGINE CONSTRUCTION // VEHICLE ARMOURING

Ceramic components are used in the lighting technology of motor vehicles in positions with generally high requirements for the following technical properties:

Static and dynamic load capacity
Electrical insulation
Thermal stability
Thermal shock resistance
Thermal conductivity
Thermal expansion
Corrosion resistance
Shape stability
Geometric precision
Topographic precision
Suitability for thin and thick film technology

Ceramic materials that have proven efficient in application and have met such requirements reliably over long periods of time are Al₂O₃ and AlN. Selected key properties are listed in the following.

Purity: >95 %
Density: >98 % of the theoretical value
Mean bending strength: >300 MPa
Mean compressive strength: >2 000 MPa
Thermal stability: >1 000 °C
Thermal conductivity: >180 W/m/K
High thermal shock resistance
Linear thermal expansion coefficient:
- Al₂O₃: 5.5 ppm/K (20 – 100 °C), 8.0 ppm/K (20 – 1000 °C)
- AlN: 3.5 ppm/K (20 – 250 °C), 5.5 ppm/K (20 – 1000 °C)
High corrosion resistance
Specific electrical resistance
- Al₂O₃: >10¹⁴ Ω*cm
- AlN: >10¹² Ω*cm
Geometric precision to the tolerance range of 0.001 mm