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Ultalite aluminum composites: aluminum composites with excellent mechanical and physical properties can be produced at low cost by reinforcing the aluminum matrix with spherical ceramic particles derived from fly ash.

Advanced Materials & Processes,  September, 2005  by Withers, Graham

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Ultalite aluminum metal-matrix composites are a combination of aluminum-silicon casting alloys and spherical ceramic reinforcing particles. The ceramic particles are derived from fly ash, a byproduct of the burning of black coal in power stations, and therefore are very low in cost. Fly ash is made up of tiny glass spheres, and consists primarily of silicon, aluminum, iron, and calcium oxides.

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The fly ash particles are collected by electrostatic precipitators from the exhaust gases in power stations. Fly ash particles can have two forms, either hollow spheres (called cenospheres) or ...

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