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Composite materials of interpenetrating inorganic and organic polymer networks
Abstracts of Patents stresses to occur. The metal is allowed to spontaneously infiltrate the permeable mass through the gating means to produce a metal matrix composite.
Method for making graded composite bodies produced thereby Yang, C.-C. (Lanxide Technology Company, LP, Newark, DE, USA) US Pat 5 240 672 (31 August 1993) Particles with a bimodal particle size or density distribution are pla_ced in suspension in a molten metal and the suspension is placed into a mould. The molten suspension is held within the mould for a sufficient time to allow at least partial settling of the particles within the mould. The suspension is then solidified to produce a composite with graded properties. Fibre and whisker reinforced composites and method for making the same Bose, A., Lankford, J., Page, R. and Blancard, C. (Southwest Research Institute, San Antonio, TX, USA) US Pat 5 240 782 (31 August 1993) A mixture of a matrix material, whiskers and a binding material is formed into sheets. The sheets are heated to burn out the binder and some of the sheets are associated with continuous fibres. The sheets are then stacked such that layers with associated continuous fibres alternate with layers that are not asso-
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ciated with such fibres. The whole is then sintered to produce a composite reinforced with both whiskers and continuous fibres.
Method for producing carbon-carbon composite materials Takabatake, M. (Petoca Ltd, Tokyo, Japan) US Pat 5 246 639 (21 September 1993) A method for producing high density and high strength carbon/carbon composites comprises impregnating pitch-based carbonaceous fibres, that have been carbonized in an inert atmosphere at a temperature between 450 and 2200~ with a carbonaceous material. The whole is then heat treated at a high temperature in an inert atmosphere, during which the volume shrinkage of the matrix exceeds that of the fibres by 6.9-45%. Composite materials of interpenetrating inorganic and organic polymer networks Novak, B.M. and Ellsworth, M.W. (The Regents of the University of California, Oakland, CA, USA) US Pat 5 254 638 (19 October 1993) A precursor polymer, with an inorganic polymer backbone and containing side chain alkoxide linkages, a polymerizable alcohol and a catalyst system are formed into a mixture and the alkoxide linkages are hydrolysed to form polymerizable alcohol monomers. The monomers are polymerized to form organic polymer chains. The remaining inor-
COMPOSITES Volume 26 Number 1 1995
ganic polymer backbone is then hydrolysed and condensed to give a solid composite material comprising interpenetrating organic and inorganic polymer networks.
Cermet or ceramic/glass composites including self-reinforced p-silicon nitride, and method of making same Pyzik, A.J. (The Dow Chemical Company, Midland, MI, USA) US Pat 5 269 989 (14 December 1993) A porous, friable a-silicon nitride preform is heated for a sufficient time to a sufficient temperature to produce a machinable porous body. It is then heated such that most of the a-silicon nitride is converted to /3-silicon nitride, after which the body is infiltrated with a metal or a glass to produce a cermet or glass/ceramic composite body. Asymmetrical method for HIPing filament reinforced annular objects Siemers, P.A. and Rutkowski, S.F. (General Electric Company, Schenectady, NY, USA) US Pat 5 271 776 (2i December 1993) A ring structure, comprising a filament reinforcement embedded in a non-consolidated plasma-deposited metal matrix, is sealed within a can which has a stronger outer wall and weaker inner and side walls. The can is then HIPed so that the ring structure is consolidated.
Method for making graded composite bodies produced thereby Yang, C.-C. (Lanxide Technology Company, LP, Newark, DE, USA) US Pat 5 240 672 (31 August 1993) Particles with a bimodal particle size or density distribution are pla_ced in suspension in a molten metal and the suspension is placed into a mould. The molten suspension is held within the mould for a sufficient time to allow at least partial settling of the particles within the mould. The suspension is then solidified to produce a composite with graded properties. Fibre and whisker reinforced composites and method for making the same Bose, A., Lankford, J., Page, R. and Blancard, C. (Southwest Research Institute, San Antonio, TX, USA) US Pat 5 240 782 (31 August 1993) A mixture of a matrix material, whiskers and a binding material is formed into sheets. The sheets are heated to burn out the binder and some of the sheets are associated with continuous fibres. The sheets are then stacked such that layers with associated continuous fibres alternate with layers that are not asso-
78
ciated with such fibres. The whole is then sintered to produce a composite reinforced with both whiskers and continuous fibres.
Method for producing carbon-carbon composite materials Takabatake, M. (Petoca Ltd, Tokyo, Japan) US Pat 5 246 639 (21 September 1993) A method for producing high density and high strength carbon/carbon composites comprises impregnating pitch-based carbonaceous fibres, that have been carbonized in an inert atmosphere at a temperature between 450 and 2200~ with a carbonaceous material. The whole is then heat treated at a high temperature in an inert atmosphere, during which the volume shrinkage of the matrix exceeds that of the fibres by 6.9-45%. Composite materials of interpenetrating inorganic and organic polymer networks Novak, B.M. and Ellsworth, M.W. (The Regents of the University of California, Oakland, CA, USA) US Pat 5 254 638 (19 October 1993) A precursor polymer, with an inorganic polymer backbone and containing side chain alkoxide linkages, a polymerizable alcohol and a catalyst system are formed into a mixture and the alkoxide linkages are hydrolysed to form polymerizable alcohol monomers. The monomers are polymerized to form organic polymer chains. The remaining inor-
COMPOSITES Volume 26 Number 1 1995
ganic polymer backbone is then hydrolysed and condensed to give a solid composite material comprising interpenetrating organic and inorganic polymer networks.
Cermet or ceramic/glass composites including self-reinforced p-silicon nitride, and method of making same Pyzik, A.J. (The Dow Chemical Company, Midland, MI, USA) US Pat 5 269 989 (14 December 1993) A porous, friable a-silicon nitride preform is heated for a sufficient time to a sufficient temperature to produce a machinable porous body. It is then heated such that most of the a-silicon nitride is converted to /3-silicon nitride, after which the body is infiltrated with a metal or a glass to produce a cermet or glass/ceramic composite body. Asymmetrical method for HIPing filament reinforced annular objects Siemers, P.A. and Rutkowski, S.F. (General Electric Company, Schenectady, NY, USA) US Pat 5 271 776 (2i December 1993) A ring structure, comprising a filament reinforcement embedded in a non-consolidated plasma-deposited metal matrix, is sealed within a can which has a stronger outer wall and weaker inner and side walls. The can is then HIPed so that the ring structure is consolidated.