Abstracts of patents Abstracts of British Patents are prepared by Dr F.R. Jones, Department of Ceramics, Glasses and Polymers, University of Sheffield, UK
UK PATENTS MATERIAL S
fibre with preformed stiffening members at right angles. A further layer of impregnated glass fibre is used to form an integral structure. Process for pultruding fibre reinforced pheno-
Reinforced ceramics (UKAEA, UK) GB 2 214 178A (31 August 1989) Sic or Si3N4 whiskers are dispersed in a slurry of ceramic precursor powders (for example SIALON) of controlled pH so that the zeta potential at the reinforcement is of opposite polarity. This causes the powder to agglomerate into a coalesced, homogenous mixture. Drying is followed by hot pressing and/or sintering into a body. Compression moulding fibrous material (Agrifibre Developments Ltd, UK) GB 2 214 857A (13 September 1989) A compression moulded straw reinforced resin for furniture components is described. Laminate structure of interior finishing material (Toyo Tire and Rubber Co.Ltd, Japan) GB 2 214 867A (13 September 1989) A polyurethane foam laminated with a glass cloth and faced with a non-woven fabric is described. Fibre reinforced composite article (United Technologies Corporation, USA) GB 2 215 718 A (27 September 1989) Fibre reinforced glass of high tensile strength, modulus and fracture toughness is described. The reinforcement is selectively, distributed monofilament and yarn.
PROCESSES Fibre reinforced racquet frame (Diversified Products Corporation, USA) G B 2 2 1 2 436A (26July 1989) A layer of braided reinforcement fibres is woven around an extruded polyethene foamed core. The fibre reinforced core is injected with a low viscosity methacrylate resin, in an appropriately shaped mould. The racquet frame requires no surface finishing. Method of producing a mat consisting of •ament loop aggregations (Kabushiki Kaisha Risuron, Japan) GB 2 214 941 A (13 September 1989) A method of producing a mat consisting of loop aggregations from thermoplastics such as polyethene or polypropene. The temperatures of several filament are maintained so that they adhere at contact points. A plastisol can be applied to the mat to form a composite. Method of constructing a scaffold plank (Superplank Pty, Australia) GB 2 215 262 A (20 September 1989) A hand lay-up process f o r the title object consists of laying up resin impregnated glass
COMPOSITES. JANUARY 1990
lic resin products (National Science Council, Taiwan) GB 2 215 264 A (20 September 1989) Conventional pultrusion by pulling fibres through a liquid resin bath into a heated die, is described. The die temperature profile, with 3 heating stages, is crucial to the process. Process for making a fibre reinforced composite article (United Technologies Corp, USA) GB 2 215 719 A (27 September 1989) Fibres and yarn are formed into tape by dry filament winding onto a mandrel and coated with a binder. The yarn is additionally coated with a slurry of glass matrix. The monofilament tape is sandwiched between the yarn tape to form a ply which can be stacked into a preform which is capable of consolidation into an artefact.
containing an elongated hole open at one end for the insertion of the sucker rod, is made from fibre-reinforced plastic. Modular composite prosthetic foot and leg Phillips, V.L. (Rancho Santa Fe, CA, USA) US Pat 4 822 363 (18 April 1989) A !ower leg prosthesis comprises a verticallyoriented pylon with an upper extremity, an intermediate shin portion, a forwardlyoriented foot portion and a rearwardly extended heel portion. Pylon and heel portion are fabricated from high-strength fibre-reinforced resin. Door structure for garage doorways Martinez, R. A. and Bohnas, R, D. (Denver, Co. USA) US Pat 4 828 004 (9 May 1989) An overhead garage door structure is described consisting of a mat-formed phenol bonded wood particle board having an overlay sheet on front and back faces of phenolic resin-impregnated fibre. Bicycle fork Foret, R. and Genin, Y. (Lyon, France) US Pat 4 828 285 (9 May 1989) A bicycle fork or similar article fabricated from resin reinforced with a textile structure is described. The fork is a one piece moulded assembly.
Composite helicopter rotor hub Toner, T.J. and Doolin, L.J. (United Technologies Corporation, Hartford, CT, USA) US Pat 4 818 179 (4 April 1989) The helicopter rotor hub comprises a number of fibre-reinforced resin triaxial braided tubular rings, formed from circumferential fibres interwoven with angled fibres about a central core, evenly spaced in a plane normal to a central axis and forming a circumferential ring structure. This structure is encompassed by a circumferential strap, also formed from triaxial braided fibre-reinforced resin, and is enclosed by fibre-reinforced resin plates above and below. Fiber reinforced plaster molds for metal casting Ravins, T.L. and Greve, D.R. (GeorgiaPacific Corporation, Atlanta, GA, USA) US Pat 4 818 287 (4 April 1989) Material for forming a mould, suitable for use in casting non-ferrous metals, comprises calcium sulphate moulding plaster reinforced with 3 wt% (insoluble calcium sulphate anhydride whiskers. Coupling pin for sucker rod made of fiberreinforced plastic material Iwasaki, T., Katoh, A., Murao, A., Tsukada, M., Nakano, T. and Nasu, M. (Nippon Kokan Kabushiki Kaisha, Tokyo, Japan) US Pat 4 822 201 (18 April 1989) The shape of a coupling pin for use with a sucker rod is described in detail. The pin,
Composite bicycle frame Duplessis, P. A. and Hogg, B. J. (Van Buren, ME, USA) US Pat 4 828 781 (9 May 1989) The front triangle of a bicycle frame is moulded from a fibre reinforced polymer matrix composite.
MATERIALS Injection moldable glass fiber reinforced polyester with improved surface finishes Light, R.R. (Eastman Kodak Company, Rochester, NY, USA) US Pat 4 810 744 (7 March 1989) The glass fibre-reinforced polyester comprises: a poly(ethylene terephthalate) resin; 10-60 wt% reinforcing glass fibres; and 0.1-10 wt% nucleating agent (a Group I, II, or IV metal cation salt of an ethylene/ methacrylic (or acrylic) acid). Carbon fibers and method for producing same Uno, H., Assi, H. and Nakao, F. (Mitsubishi Rayon Company Limited, Tokyo, Japan) US Pat 4 814157 (21 March 1989) PAN-based carbon fibres which will impart high tensile strength to composite materials contain 0.5-4.5 wt% nitrogen. The nitrogen is present in a highly specific elemental relationship as confirmed by XPS measurements. Hybrid titanium alloy matrix composites Rosenthal, D.G. and Goebel, J.A. (Avco Lycoming/subsidiary of Textron Incorporated, Stratford, CT, USA) US Pat 4 816 347 (28 March 1989)