Metal Matrix Composite (MMC)

Metal/Ceramic Composites in Light Metal Construction

The range of applications for high-strength light metal components – primarily aluminum, but also magnesium and titanium – is constantly growing. The motivation for using light metals in the automotive industry is to reduce weight and ultimately lower fuel consumption and emissions.

Worth knowing:

Characteristic Example of CeramTec’s Metal/Ceramic Composite AO-403

  • Metal alloy 60 Vol.-% AlSi9MgMn
  • Ceramic 40 Vol.-% Al2O3
  • Density 3.21 g/cm3
  • Flexural strength 550 to 620 MPa
  • Tensile strength 380 to 460 MPa
  • Breakage load approx. 0.5%

However, light metal construction reaches its limits in areas where it must withstand high tribological, mechanical or thermal stresses. These weaknesses can be resolved while maintaining a low component weight through targeted and in some cases partial reinforcement of the metal with ceramic particles. It is possible to vary the type of ceramic particles, their size and volume fractions. The objectives of the technical and application-specific structure design for such ceramics include:

  • Increase mechanical strength
  • Influence friction and wear (tribology)
  • Influence thermal expansion
  • Improve thermal stability

Application examples for metal/ceramic composites (also called metal matrix composites, MMC) are cylinder sleeves in engines (tribology), piston-recess walls (tribology), brake pad backing plates (weight), bearings (thermal expansion), brake discs (tribology), sporting goods or heat-sinks in electronics.

  • Advanced Ceramics for Metal Working

    Special Reproduction of Ceramic Applications, Issue September 2016

    • Language: PDF, 3.2 MB

    • Language: PDF, 3.2 MB