Metal matrix composites

Metal matrix composites

Wrenn, Jr., G.E., Abbatiello, L.A. and Lewis, Jr., J. (US Department of Energy, Washington, DC, USA) US Pat 4 818 448 (4 April 1989) The method of for...

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Wrenn, Jr., G.E., Abbatiello, L.A. and Lewis, Jr., J. (US Department of Energy, Washington, DC, USA) US Pat 4 818 448 (4 April 1989) The method of forming a carbon-bonded carbon fibre composite, with a density of 0.04-0.10 g c m 3, comprises: forming an aqueous slurry of carbonaceous fibres and a thermosetting resin precursor in the presence of a perforated and configured mandrel; draining the water away through the mandrel until the solid material is deposited thereon to the required thickness; heating this solid billet to cure the resin; removing the moulded billet from the mandrel; and then heating it in an inert atmosphere to carbonize the carbonizable material in the billet to form the composite. Process to prevent crack formation in the production of carbon fibres Yamada, Y., Imamura, T., Honda, H., Tsuchitani, M. and Nakajima, R. (Itaru Todorok, Director-General of the Agency of Industrial Science and Technology and Maruzen Petrochemical Company Limited, Tokyo, Japan) US Pat 4 818 449 (4 April 1989) The carbon fibres are produced by melt spinning. Molten mesophase pitch is extruded through a nozzle in such a way that it is given a rotary motion immediately prior to passing through the hole of the nozzle• The fibres are then rendered into an infusible state by heating in an oxidizing atmosphere and then carbonized or graphitized by heating in an inert atmosphere. Process for the production of pitch-type carbon fibers Hara, H., Kagizaki, M., Takakura, T. and Tomono, S. (Mitsubishi Chemical Industries Limited, Tokyo, Japan) US Pat 4 818 612 (4

April 1989) The carbon fibres produced have a crosssectional uniform mesh-like crystal structure, as observed by a polarizing microscope. Apparatus and method for pultruding rein° forced plastic articles Beever, W.H. and Selby, L.M. (Phillips Petroleum Company, Bartlesville, OK, USA) US Pat 4 820 366 (11 April 1989) The apparatus comprises: a means of supplying continuous resin-impregnated reinforcing material; a section for partially consolidating wherein the material is heated and tapered to an oversized constant crosssection; a second section wherein the material is heated, at a lower temperature than in the first section, and tapered to the required size; and a means of pulling the material through both sections. Whisker reinforced ceramic and a method of clad/hot isostatic pressing same Mehrotra, P.K., Swiokla, J.L. and Billman, E.R. (Kennametal Incorporated, Latrobe, PA, USA) US Pat 4 820 663 (11 April 1989) A method for achieving a density > 95% theoretical in a shaped ceramic component comprises: forming a compact substrate of sinterable ceramic containing i> 5 vol% ceramic whiskers; applying a coating to the substrate by vapour deposition of a ceramic composition that does not become vitreous before or during the next step; and heating and isostatically pressing the coated compact





in an atmosphere that reacts with the coating and/or the compact at temperatures and pressures to cause the compact to approach theoretical density. Method to produce titanium metal matrix composites with improved fracture and creep resistance Eylon, D. and Froes, F.H. (The Secretary of the Air Force, Washington, DC, USA) US

Pat 4 822 432 (18 April 1989) A method for improving the microstructure of a consolidated metal matrix composite consisting of a number of alternating layers of titanium alloy and reinforcing fibres comprises: heating the composite to a temperature below that at which interfacial reactions occur and diffusing hydrogen into the composite; altering the temperature to that at which transformation of (HCP) alpha to (BCC) beta occurs; cooling to room temperature; reheating to a temperature below the transformation temperature and diffusing the hydrogen out of the composite; and cooling to room temperature. Composite material and method of manufacturing same Pommier, J-C. and Poustis, J. (La Cellulose du Pin, Bordeaux, France) US Pat 4 822 826

(18 April 1989) After treating discontinuous cellulosic fibres to remove the water content they are added to a thermoplastic resin system in a mould• The mould is then subjected to sufficient heat and pressure to cure the resin and produce a composite material. Method for repairing damaged composite articles White, W.D., Puckett, P.M., Blankenship, L.T. and White, M.N. (The Dow Chemical Company, Midland, MI, USA) US Pat 4 824

500 (25 April 1989) A curable resinous composition which may be used to bond plies of metal or reinforced plastic to the prepared surface of a damaged composite comprises: one or more vinyl ester resins modified with one or more rubbers or elastomers; (optionally) a polymerizable ethylenically unsaturated monomer; a curing agent or catalyst for the vinyl ester resins; and (optionally) an accelerator for the curing agent or catalyst. Composites of thermoplastic polymers and silica reinforcing fibers Sterzel, H-J. (BASF Aktiengesellschaft, Ludwigshafen, FRG) US Pat 4 824 878 (25

April 1989) Silica reinforcing fibres of diameter < 1 ~tm and length/diameter ratio > 10 are produced in a homogenous organic phase either by condensation of silicic acid and/or polysilicic acid or by hydrolysis and subsequent condensation of polysilicates, in the presence of the thermoplastic polymer (softening point >

150oc). Metal matrix composites White, D. R., Urquhart, A. W., Aghajanian, M. K. and Creber, D. K. (Lanxide Tech. Co., Newark, DE, USA) US Pat 4 828 008 (9 May

1989) Describes a technique for making an Al alloy matrix composite bearing a layer of AIN. An alloy is positioned adjacent to a permeable

mass of ceramic filler material, and the alloy is melted in the presence of a non-oxidizing gas and infiltrates the ceramic. After the desired infiltration the AI is held in the gas to form AIN on at least one surface and allowed to form a solid AI alloy matrix structure embedding the ceramic filler and containing AIN on one surface. Method of manufacturing a complex body of sintered ceramic material and metal Taniguchi, M. and Narita, Y. (NGK Spark Plug Co. Ltd., Aichi, Japan) US Pat 4 828 009

(9 May 1989) The forming method entails providing a through-hole 0.5-3 mm diameter in sintered ceramic for gas release and cast embedding the ceramic in the metal. Apparatus for moulding and solidifying a resinous composite structure Itoh, Y., Sakamoto, K. and Miyabe, H. (Kawasaki Jukogyo Kabushiki Kaisha, Kobe, Japan) US Pat 4 828 472 (9 May 1989) The apparatus for moulding and curing a resin matrix composite under pressure and heat uses a bag to cover the material in an autoclave. Applied pressure and heat can be varied at several positions around the bag. Flexible glass fibre mat bonding method Glascock, H. H. and Carlson, R. O. (GE Co., Schenectady, N Y , USA) US Pat 4 828 597 (9

May 1989) First and second layers of material having similar coefficients of thermal expansion are bonded with an interlayer mat of flexible glass fibres. The stack is then heated until the interlayer glass deforms and adheres to fibres in the first and second layers and then cooled. Process for making aerated concrete De Chiffre, C. and De Chiffre, E. (Milan, Italy) US Pat 4 828 618 (9 May 1989) Aggregates consisting of at least grains of sand and fibres are pretreated with a reactive agent additive consisting of AI powder, hydrosoluble cellulose derivative and surface active agent which reacts in a basic aqueous environment to produce gas. Gas is produced on each aggregate particle and therefore forms a uniform distribution of macrovoids throughout the concrete. Process for impregnating a concrete or cement body with a polymeric material Mattus, A. J. and Spence, R. D. (Department of Energy, Washington DC, USA) US

Pat4828 761 (9 May 1989) Organic soluble hut water insoluble solids are mixed with powdered cement and water. The slurry is solidified and contacted with an organic solvent comprising a polymerizable monomer and a polymerizing catalyst for the monomer. Some of the dispersed organic soluble material dissolves and is distributed within the solid. The polymerizable monomer is cured to form a water resistant body. Process for impregnating thermoplastic or thermosetting polymers in long solid state fibres Morel, E. M. J. and Richert, G. M. (INRCA, Paris, France) US Pat 4 828 776 (9 May 1989) A method is described for forming a unidirectionally reinforced composite comprising natural or synthetic mineral or organic fibres and polymer matrix.