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DEVELOPMENT OF A POROUS METALLIC COMPOSITE MATERIAL
EMERSON AND CUMING INC CANTON MASS
The feasibility of making a porous metallic composite by bonding hollow metal spheres was demonstrated. Methods were developed for making hollow metal spheres by metallizing the surface of ceramic and plastic spheres. Hollow glass microspheres in the 1. 0 to 5. 0-mil diam. range were metallized by electroless Cu, Ni, and Ag processes. The building up of a sufficient metal thickness on these microspheres for bonding into a porous metallic composite appears impractical. Hollow clay spheres and hollow alumina bubbles were metallized by both electroless processes and by electrolytic processes. Expanded polystyrene spheres were metallized by electrolytic processes. Heavy metal coatings of 1 to 5 mils thickness were electroplated on 137-mil diam polystyrene spheres. The polystyrene was then completely removed by heating to 600-650 F. Ni, Cu, and Ag were successfully electroplated to form hollow metal spheres by this process. Author
DA19 020 505ORD4971