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WO1991015619A1 - Armature et structure renforcee - Google Patents

Armature et structure renforcee Download PDF

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Publication number
WO1991015619A1
WO1991015619A1 PCT/GB1991/000473 GB9100473W WO9115619A1 WO 1991015619 A1 WO1991015619 A1 WO 1991015619A1 GB 9100473 W GB9100473 W GB 9100473W WO 9115619 A1 WO9115619 A1 WO 9115619A1
Authority
WO
WIPO (PCT)
Prior art keywords
preform
yarn
filaments
range
knitted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB1991/000473
Other languages
English (en)
Inventor
Geoffrey Thomas Hickman
Andrew William Mackie
Frank Robinson
Dennis John Williams
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Akzo Nobel UK PLC
Original Assignee
Courtaulds PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Courtaulds PLC filed Critical Courtaulds PLC
Publication of WO1991015619A1 publication Critical patent/WO1991015619A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/447—Yarns or threads for specific use in general industrial applications, e.g. as filters or reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2309/00—Use of inorganic materials not provided for in groups B29K2303/00 - B29K2307/00, as reinforcement
    • B29K2309/02—Ceramics
    • B29K2309/04—Carbides; Nitrides

Definitions

  • This invention relates to reinforcement preforms and reinforced structures incorporating such preforms and has particular reference to preforms and composite structures formed of and containing silicon carbide filaments.
  • Mats of reinforcing fibres have been used for many years particularly for glass reinforced structures. whereby continuous filaments of reinforcing material are incorporated into the composite structure by being laid in a mould and impregnated with resin. Because the mats are difficult to handle and tend to give rise to uneven layering of the reinforcement fibres in the composite structure it is known to use woven structures of, for example, glass fibres to lay the reinforcement into the mould.
  • Woven structures are, however, less flexible than mats and as a result it can be difficult to produce a composite in a complex shape using a woven preform.
  • preform as used herein is intended to cover a pre-shaped mass of reinforcement material for supsequent incorporation into a composite structure.
  • Silicon carbide has an even higher modulus than carpon fibre and therefore it has proven even more difficult to produce reinforced structures incorporating silicon carbide fibres than has even been the case with reinforced carpon fibres.
  • the present invention provides a preform formed of silicon carbide fibres and a composite structure ingorporating such a preform.
  • a preform for reinforcing a composite structure characterised in that the preform is a knitted preform having been knitted from a yarn of silicon carbide based staple fibre material, the yarn having individual filaments of a diameter of less than 11 microns and having an average staple length greater than 40 mm and less than 400 mm, there being at least 30 filaments of silicon carbide fibre at any point along the length of the yarn, the yarn having a twist in the range 150 to 600 turns per metre.
  • At least 95% of the staple has a length in the range 40mm to 400mm, and further preferably at least 99% of the staple has a length in the range 40mm to 400mm.
  • At least 95% of the filaments of silicon carpide have a diameter of less than 10 microns. Further preferably the majority of the filament diameters of the individual f i l aments in tne yarn is in the range 6 to 9 microns.
  • the staple length of the fibres is further preferably in the range 60mm to 300mm.
  • the staple length may be in tne range of 60mm to 240mm.
  • the yarn may contain 200 filaments at any point.
  • the twist of the yarn is preferaply in the range 150 to 500, further preferably 200-400, and further preferaply 250 to 300 turns per metre.
  • the yarn may be formed by stretch breaking a tow of silicon carbide filaments.
  • the stretch broken tow may be spun into the yarn for knitting purposes.
  • the preform may be knitted on a two bed flat macnine.
  • the needle density is less than 10 needles per
  • the preform may be weft knitted and the yarn may be l ubri cated prior to knitting.
  • the composite structure incorporating a knitted preform of the type set out above may comprise a silicon carbide fibre reinforced silicon carbide structure.
  • the silicon carbide may be vapour phase deposited onto the preform to produce a structure.
  • the preform may be neat treated to burn off the lubricant. if used. prior to vapour phase depos i t i on of the silicon carpide outer layer.
  • the preform may have any desirable shape.
  • the preform may be double jersey knitted.
  • the fibre structure may be a pyrclised mixture of the following three functional qroups:-
  • the fibre preferaply has a tensile strength of not less than 250kg/mm 2 , a modulus of 12,000 kg/mm 2 and a strain to failure in the range 2.0 to 2.3 % .
  • tne silicon carpide fibres can be produced from organochlorosilanes which are converted to polysilanes by alkali metal reduction i.e.
  • This poiysiloxane intermediate is spun into fibre by melt spinning.
  • the fibres are then oxicativeiy crosslinked and pyrolised to form silicon carbide fibres containing an excess of carpon ana oxygen.
  • Additional reinforcement material may pe inlaid into the silicon carbide knitted preform. It is important to note. however, tnat by the present invention a silicon carbide Knitted preform can be knitted from tne silicon carbide reinforcing material itself.
  • a silicon carpide fibre incorporating titanium alkoxide was used in tne first embodiment.
  • the fibre had been produced from a polymer structure believed to centain a mixture of the following functional qroups:-
  • the polymer is extruded to form a plurality of very fine filaments of polymer. These filaments are then oyrolised to produce a fibre having the following composition:
  • a tow having 12,000 filaments each of a diameter of approximately 8 to 10 microns was stretch broken and spun to give a yarn formed of staple material.
  • a draw ratio of 20 was used to give a final yarn having 600 filaments at a typical cress secti on .
  • the l ength of the stap l e was i n the range 60mm to 200mm.
  • This yarn was then lubricated with an aerosol stain- free knitting oil and knitted into a composite structure utilising a double bed flat knitting machine.
  • a double jersey knit was used, it was found that the silicon carbide material could be knitted into suitable shapes for incorporation into composite structures, and the preforms could be used without any need for cutting.
  • the preforms had a continuous edge and having an inherent flexibility and stretchability, the preforms could be moulded into a suitable shape for such purposes as blades for gas turbine engines, for example for aircraft.
  • the preform formed a suitable basis for the deposition of silicon carbide by vapour phase deposition to form a silicon carbide-silicon carpide reinforced composite structure capable of withstanding extremely nigh temperatures (up to 1900°C) and the conditions of shock load and thermal cycling imposed on an aircraft engine during use.
  • tne use of a double jersey knitting tecnmque enables further reinforcing filaments to be laid into the knitted preform.
  • the preform directly from silicon carbide filaments itself, the maximum amount of reinforcement in the structure can be obtained compared to inlaying silicon carpide strands in a non-silicon carbide knitted matrix.
  • any form of structure can be produced from the filaments. It is even more surprising tnat a knitted preform can pe produced.
  • the conditions laid down herein are not met namely, tne use of indivicual filaments of diameter less than a specified size, the use of yarn from staple material, the use of a minimum and maximum staple length. the use of a minimum nurnper of filaments at any point along the length of the yarn, and a twist in a specifiec range, it is net possible to knit the silicon caroide preform.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Textile Engineering (AREA)
  • Knitting Of Fabric (AREA)
  • Woven Fabrics (AREA)

Abstract

Préforme d'armature tricotée dans un fil de carbure de silicium possédant un diamètre de brin inférieur à 11 microns et une longueur de coupe moyenne située entre 40 et 400 mm, une torsion située entre 150 et 600 tours par mètre et au moins 30 brins en tout point de la longueur du fil.
PCT/GB1991/000473 1990-03-30 1991-03-27 Armature et structure renforcee Ceased WO1991015619A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9007166.3 1990-03-30
GB909007166A GB9007166D0 (en) 1990-03-30 1990-03-30 Reinforcement and reinforced structure

Publications (1)

Publication Number Publication Date
WO1991015619A1 true WO1991015619A1 (fr) 1991-10-17

Family

ID=10673558

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/000473 Ceased WO1991015619A1 (fr) 1990-03-30 1991-03-27 Armature et structure renforcee

Country Status (2)

Country Link
GB (1) GB9007166D0 (fr)
WO (1) WO1991015619A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014122157A1 (fr) * 2013-02-07 2014-08-14 Lm Wp Patent Holding A/S Corde ayant des fibres de renfort hachées

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6411562A (fr) * 1964-10-05 1966-04-06
DE1685667A1 (de) * 1968-02-27 1971-08-26 Gen Technologies Corp Whisker-Einzelfaden und Verfahren zu seiner Herstellung
JPS5636604A (en) * 1979-08-31 1981-04-09 Nippon Telegr & Teleph Corp <Ntt> Single core optical fiber cable
EP0050854A1 (fr) * 1980-10-27 1982-05-05 Hitachi, Ltd. Produit fibreux composé
WO1989003759A1 (fr) * 1987-10-30 1989-05-05 Courtaulds Plc Materiau composite

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6411562A (fr) * 1964-10-05 1966-04-06
DE1685667A1 (de) * 1968-02-27 1971-08-26 Gen Technologies Corp Whisker-Einzelfaden und Verfahren zu seiner Herstellung
JPS5636604A (en) * 1979-08-31 1981-04-09 Nippon Telegr & Teleph Corp <Ntt> Single core optical fiber cable
EP0050854A1 (fr) * 1980-10-27 1982-05-05 Hitachi, Ltd. Produit fibreux composé
WO1989003759A1 (fr) * 1987-10-30 1989-05-05 Courtaulds Plc Materiau composite

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 092 (P-066)June 16, 1981 & JP-A-56 036 604 (NIPPON TELEGR. & TELEPH. CORP. ) April 9, 1981 see the whole document *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014122157A1 (fr) * 2013-02-07 2014-08-14 Lm Wp Patent Holding A/S Corde ayant des fibres de renfort hachées

Also Published As

Publication number Publication date
GB9007166D0 (en) 1990-05-30

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