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Automotive engineering
– Brake system
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
The brake system is the central safety system in a vehicle. The focus here is on the brake disk as its technical properties are crucial for the braking response of a vehicle and its service life.
At around the turn of the millennium, an automobile manufacturer installed ceramic brake disks in series-manufactured motor vehicles for the first time as, compared with conventional metal brake disks, they feature the following properties:
- Low weight
- No decrease in the braking effect even with longer deceleration distances
- No juddering
- High thermal stability
- High thermal shock resistance
- High hardness
- High wear resistance
- Corrosion resistance
- Unusually long service lifetime
The material that brings these special properties is a non-oxide ceramic composite of the type SiSiC, with carbon fibres embedded in the matrix.
Some characteristic properties of such a material (manufacturer’s specifications) are summarized in the following:
- Density: 2.45 g/cm³
- Tensile strength: 20 – 40 MPa
- Bending strength: 50 – 80 MPa
- E modulus: 30 GPa
- Strain at break: 0.3 %
- Pseudoductile behaviour
- Maximum application temperature: 900 °C
- Thermal conductivity: 40 W/m/K
- Linear coefficient of thermal expansion: 2.6 – 3.0 ppm/K
