with molten silicon under vacuum. Silicon carbide can also be included in a resin bound prepreg, prior to impregnation with silicon. Moulding reinforced resin articles (Rolls-Royce Limited, UK) GB 2 065 016 A (24 June 1981) A method of making a fibre-reinforced composite fan blade is described. Thermoplastic polysulphone/carbon fibre prepreg is laid-up onto a former. Any inserts or reinforcing pins can be inserted while hot, so that they remain located after cooling and during injection with a thermosetting resin. Method and apparatus to mould reinforced resin articles (Nava, P.L. and Superiore, V., Italy) GB 2 066 144 A (8 July 1981) An hydraulic fluid is used to inflate a rubber male mould which impregnates the resin into the fibrous reinforcement at the wall of the female mould. Composite structure (Rolls-Royce Limited, UK) GB 2 067 455 A (30July 1981) Consolidation of resin impregnated fibres contained in a female mould is achieved by melting the low melting former so that it expands and compresses the composite against the wall of the mould. Fibre reinforced materials and methods of making and using them (Smith, H.R., UK) GB 2 067 612 A (30 July 1981) Thermoplastic coated fibre tows are woven, knitted or chopped and subsequently consolidated in a composite under pressure and temperature. Method and apparatus for reinforced concrete products and products made thereby (Rotondo, P.L. and T.J., USA) GB 2 068 288 A (12 August 1981) A reinforcing-wire cutting and ejection mechanism, which automatically distributes the fibres into concrete for casting into poles or slabs, is described. Apparatus for drawing of glass fibre (Nitto Bozeki Company Ltd, Japan) GB 2 072 653 A (7 October 1981) A bulk gas drawing technique with automatic fibre break detection and correction devices, is described. Method and apparatus for separating carbon black from fiberglass (Tosco Corporation, USA) GB 2 073 059 A (14 October 1981) The pyrolysis of water rubber tyres produces a carbon black/glass fibre mat. The invention is an agitator and separation technique for the two components. Polyvinyl alcohol synthetic fibres (Kuraray and Company Limited, Japan) GB 2 073 653 A (21 October 1981) The adhesion of synthetic fibres of polyvinyl alcohol to cement is improved by incorporating a granular compound (eg Ca CO3, Ca SO4, ect) in the spinning dope. Etching of the calcium compound results in a larger surface area. Cement hydration products can nucleate on the fibre surface, giving good adhesion.
COMPOSITES . J U L Y 1983
Preparation of vitreous melt used in the production of fibres (Amfu Limited, UK) GB 2 074 149 A (28 October 1981) A vitreous melt for alkali resistant glass fibres is made by dispersing ziconium sulphate into a basalt melt with the aid of sodium silicate solution and sodium carbonate. Preparation of articles based on thermoplastic polymers reinforced with glass fibres (Montedison SpA, Italy) GB 2 075 077 A (11 November 1981) Glass fibre polyalkenes are prepared with good surface finish using a paper-making process in which dispersions of polyethene fibrils and glass fibres are deposited as sheets, pressed and calendered or oven heated for cold-pressing. The polyethene fibrils are pretreated with PVAc/PVAl. Producing reinforced composite racket frame (Lo, K.-N., Taiwan) GB 2 075 412 A (18 November 1981) Consolidation of the resin and fibres is achieved in two stages; firstly by compressed air in the cellophane tube, and subsequently during heating and curing by a foamable rubber core. Silicon carbide fibre reinforced glass composites (United Technologies Corporation, USA) GB 2 075 490 A (18 November 1981) A filament winding technique, in which the SiC yarn is pulled through a slip of particulate glass, is used to prepare an impregnated tape for further fabrication and hot-pressing. Fabrication of fiber reinforced resin structures (Sea-Log Corporation, USA) GB 2 078 599 A (13 January 1982) A pultrusion technique is described, in which the final curing occurs in a mass of heated steel balls which act as a heat sink for the exotherm. Careful control of the curing and impregnation allows the correct incorporation of an optical fibre.
ation of laminates, is formed from a first layer and a second, uncured and substantially non-self-curing, filled resin. The first layer is relatively non-compressible compared with the second layer, which is readily flowable under the application of a compressive force. The second layer retains its flowability for an extended period of time, until used to fabricate said laminated structures. Fiber lubricated bearings Scheetz, H.A. (The Polymer Corporation, Reading, PA, USA) US Pat 4 285 168 (25 August 1981) The bearing material consists of 0.5-10 wt% oriented polytetrafluoroethylene fibres in a rigid polyurethane polymer. The bearing surface has exposed fibres extending beyond the surface of the matrix. Reinforced tread assembly Seegers, G.A. (American Stair Corporation Incorporated, Willow Springs, IL, USA) US Pat 4 285 177 (25 August 1981) A lightweight, glass reinforced concrete tread assembly for a staircase is described. Thermoset resin impregnated web and process of making Moore, C.B. (W.R. Grace & Company, Cambridge, MA, USA) US Pat 4 286 030 (25 August 1981) A method of preparing an article comprising 15-95% (by weight of fibre) cellulosic fibre, 5-85 % of thermoplastic synthetic pulp fibre, and at least 5% of thermoset resin, is described. Gaskets for electric shielding Sado, R. (Shin-Etsu Polymer Company Limited, Tokyo, Japan) US Pat 4 288 081 (8 September 1981) The method of preparation of an electrically sheilding gasket is described. The product is a composite containing flakes of an electrically conductive material in an electrically insulating, rubbery elastic matrix.
US PATENTS COMPONEN TS Elastomeric composite pavement Lucik, D.M. (The Johnson Rubber Company, Burton Township, OH, USA) US Pat 4 284 366 (18 August 1981) A moulded paving block is described, which consists of an elastomeric composite body with aggregate materials dispersed therein. The block has a moulded wear surface, which is substantially aggregate with little free covering of the elastomeric base material. Filled resin coated tape Blad, L.H. and Griffin, C.F. (Lockheed Corporation, Burbank, CA, USA) US Pat 4 284 679 (18 August 1981) A resinous material suitable for the fabric-
Process for preparation of fiber-reinforced magnesium alloy materials Ban, K., Arai, T. and Daimaru, A. (Honda Giken Kogyo Kabushiki Kaisha, Tokyo, Japan) US Pat 4 279 289 (21 July 1981) Magnesium matrix composite articles are formed by pouring molten Mg alloy at ~ 800°C into a mould containing shaped silica-alumina fibres (average diameter < 2~m) and curing at high pressure. Reaction between the Mg alloys and the fibres causes the finished component to contain precipitates of Mg-Si and Mg-Al compounds. Process for forming friction materials Piersol, J.A. (Armstrong World Industries Incorporated, Lancaster, PA, USA) US Pat 4 279 696 (21 July 1981) The material is formed from a slurry of 5-15 wt% refined cellulose fibres, 25-70 wt% fine metal fibres, 12-15 wt% powdered resin, 5-15 wt% rubber latex, and 5-25 wt% inorganic fillers. The metal fibres are evenly dispersed through the finished sheet.