This housing and mirror set was cast in MMC for a lightweight optical reflecting telescope. The housing is cast in 20% MMC and measures 17 x 16 x 14 in. with a base 0.08 in. wall thickness. The three mirror castings are cast in 30% MMC and after machining, plating and polish- ing, fit into the housing to form the telescope.


use of such materials. For all these rea- sons, metal matrix composites are only at the beginning of the evolution curve of modern materials. As lightweight, stiff, wear-resistant applications be- come of greater value to the transpor- tation and other industries, more high


volume uses will evolve; brake rotors, pistons and drive yokes are examples. MMC production melting metal-


lurgy and pouring presently are of greater technical importance than using powder metallurgy composite material. Casting is more economical and has


32 | METAL CASTING DESIGN & PURCHASING | Nov/Dec 2014


the advantage of being able to use well proven processes such as investment casting. Casting also offers the engineer more freedom than other processes. An objective in the development of light metal composite materials may be to increase the modulus of elasticity


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