15-09-1965 дата публикации
Номер: GB0001004352A
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A sintered foamed structure consisting of a metal, alloy, metal compound, metalloid compound or graphite is made by impregnating a porous organic structure such as polyurethane, polystyrene, cellulose or isocyanate sponge, with a fluidized powder suspension of the material, heating to decompose and carbonize the organic structure and finally sintering below the melting temperature. The organic structure may be a mesh, cloth or a cured foam and the powder suspension is formed with water or an organic liquid such as acetone or toluene as a thinner and a binder such as resins, e.g. silicones, epoxy phenolic, gum cellulose gel, methacrylates, alginates, P.V.A. and sugar syrup. The weight ratio of powder to binder is 1-11 parts: 1 part and the suspension may also include a thickener, e.g. a metal hydride or salt. The powder to be foamed may be W, Nb, Ta, Re, Ni, Cu, Pb, Ag, Pt, and mixtures of these, an alloy such as a Ni base containing 0.1% C, 22% Cr, 1.5% Co, 9% Mo, 0.6% W, 18.5% Fe, compounds ...
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