Metal matrix composite

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Metal matrix composites (engl. Metal matrix composite , MMC ) consist of a continuous metal matrix having a discontinuous ceramic or organic reinforcement in its interior, often in the form of fibers or whiskers . So-called preform MMCs, in which both phases are continuous, are often referred to as MMCs. One of the first applications was in the Space Shuttle program around 1975. This was a very light (approx. 1.8–3.5 g / cm³), difficult to machine material with good thermal conductivity and low thermal expansion. Other properties can also be set in a targeted manner in accordance with the requirements during manufacture.

MMC is usually made of reinforced aluminum or titanium , in special cases also reinforced magnesium and copper materials . The matrix is ​​in the form of an elemental metal or in the form of an alloy . Ceramic particles (e.g. silicon carbide ), short fibers, continuous fibers (based on carbon) or foams with open porosity are used as the reinforcement phase.

There are several manufacturing processes for metal matrix composites:

MMC are used commercially in power electronics, the automotive industry ( brake drums , drive shafts , cylinder liners ), the railroad (brake drums), in aviation and as cutting tools.

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