Al / SiC Metal Matrix Composite (MMC)

O’Fallon Casting is the preeminent manufacturer of Investment Cast Al/SiC Metal Matrix Composite (MMC) castings in the world today. Its family of cast MMC’s contains particles of Silicon Carbide, ranging in size of 9 to 38 microns, homogeneously suspended in an aluminum matrix. The particle density can be varied, from 20%, 30% & 40% Silicon Carbide by volume to create “scaleable” properties in the composite.

Al/SiC MMC’s offer very desirable material properties when compared to standard aluminum alloys:

  • High Thermal Conductivity
  • Low Coefficient of Thermal Expansion
  • High Strength to Weight
  • Dimensional Stability
  • Vibration Dampening
  • High Wear Resistance


With its unique set of properties MMC alloys have been employed in diverse applications such as moving structures in high speed equipment for manufacturing, brake rotors for vehicles, heat sinks for electronics and as housings & mirrors for optics. Al/SiC MMC’s have a stiffness comparable to cast Beryllium Aluminum but without the potential health hazard.

MMC’s can be somewhat difficult to machine. The Near Net Shape capability of Investment Casting is an effective method to minimize the secondary machining.

For more information on our Al/SiC MMC's, please see the link below:

AlSiC MMC Alloys