GB1301194A - Improvements in or relating to composite material and process for its production - Google Patents

Abstract

1301194 Laminates AUGUST THYSSENHUTTE AG 2 March 1970 [4 March 1969] 9947/70 Heading B5N [Also in Divisions C1 C3 and H1] A laminated structure comprises: (a) one or more layers of a matrix containing high-strength monocrystals (C) having one-dimensional or two-dimensional extended form, and (b) one or more layers not containing such monocrystals. Either or both of (a) and (b) may comprise porous or foamed material. Crystals (C) have greater strength than the matrix containing them. (C) are grown in a primary alloy and liberated chemieally or electrochemically therefrom. The matrix may be epoxide resin, polycarbonate, polyeyanate, polyisocyanate, polysulphone, phenoxy, polybenzimidazole, polyimide, polytriazole, or polyethylene-2,6-naphthylene dicarboxylate; or Cu, Ag, Al or alloy thereof; or glass or ceramic. Also present in the material may be glass, boron, carbon or whiskers. (C) may be carbides, nitrides, carbonitrides, carbosulphides, phosphides, sulphides, borides, and/or oxides of Mn, Cr, Mo, Nb, Ta, Zr, V, W, Si and/or Al; or they may be intermetallic compounds. They may be magnetic and may be magnetically oriented when united with the matrix. (C) may be < 0À1 Ám thick. They may be lamellae with holes and/or beads, or branched fibres. The primary alloy may comprise α and/or γ mixed crystals of Fe and an element alloyable therewith, it may be an alloy of Fe and one or more of Al, As, B, Be, Co, Cr, Mg, Mn, Mo, Nb, Ni, P, Pd, Si, Ta, Ti, V, Zn, and/or Zr. The alloy may be heat treated, e.g. after, or in conjunction with, shaping. After crystals (C) are liberated from the alloy, they may be chemically treated to promote bonding to the matrix, e.g. by silanization with vinyl triethoxy-silane. (C) may be incorporated in the matrix by in situ polymerization, e.g. using caprolactam or polyimide still containing free COOH groups, or with p-xylylene using gasphase polymerization.