The main applications of silicon nitride ceramics in the automotive field are: automotive diesel engines, automotive ceramic brake discs, automotive engine PCU power control systems, and ceramic substrates.
| Comparison table of physical properties of ceramic substrate materials | |||
| Performance parameters/Substrate material | Silicon Nitride | Aluminum Nitride | Alumina Oxide |
| Strength/MPa | 600-800 | 350 | 400 |
| Fracture Toughness/(Mpa m1/2) | 6.0-8.0 | 2.7 | 3.0 |
| Thermal Conductivity/[(m.K)] | 80-100 | 150 | 20-30 |
| Current carrying capacity/A | ≥300 | 100-300 | ≤100 |
| Thermal resistance/(℃/W) | ≤0.5(0.5 m Cu) | ≤0.5(0.3 m Cu) | ≥1.0(0.3 m Cu) |