摘要:
The invention relates to a method for making a thermoplastic composite part by moulding, that comprises: making several portions of the part according to a moulding method that comprises placing in a mould a composite material containing fibres imbedded in a thermoplastic matrix while arranging the material so that the fibres contained therein are oriented along one or more preferred directions; submitting said mould to particular pressure and temperature conditions knowing that for each of the different portions, the fibres may be of different natures and dimensions and may be oriented in different directions while the thermoplastic matrix and that of the material used for making the first portion are identical or compatible; and assembling the different portions obtained, placing them in a mould, and submitting the latter to particular pressure and temperature conditions.
摘要:
Die Erfindung betrifft ein flächiges oder dreidimensionales Halbzeug für die Herstellung von Bauteilen aus faserverstärkten Verbundwerkstoffen, wobei das Halbzeug folgende Komponenten umfasst : eine aus Verstärkungsfasern gebildete zwei-oder dreidimensionale Struktur, optional einen Matrixbildner in der aus den Verstärkungsfasern gebildeten Struktur und mindestens einen sich kontinuierlich von einem Rand des Halbzeugs zu einem zweiten Rand des Halbzeugs erstreckenden Strang (1) aus elektrisch leitfähigen Fasern, welcher mindestens zwei Kontaktstellen für ein elektrische Kontaktierung aufweist und gegenüber seiner Umgebung im Halbzeug elektrisch isoliert ist. Die mit Kontaktstellen versehenen elektrisch leitfähigen Faserstränge erlauben die Einleitung elektrischer Energie in die Faser-verbünd-Struktur und deren Untersuchung mittels elektrischer Signale.
摘要:
Disclosed are a radiation absorptive material and more particularly a method of economically coating halloysite or other mineral tubules (including nanotubules and microtubules) with a conductive metal (Cu) in order to produce an absorptive composite material capable of providing shielding and attenuation of radio-frequency signals.
摘要:
The invention relates to a moulding tool for the production of components made from fibre composite materials, the mould tool comprisign a fibre composite structure and an electrical resistance, wherein carbon fibres or carbon filaments are laid in a plastic matrix near the forming surface of the mould tool in the fibre composite structure of the mould tool. Such a mould tool is further improved wherein the carbon fibres or carbon filaments in the plastic matrix near the forming surface essentially determine the mechanical resistance of the mould tool and the electrical resistance heating element is connected such that at least individual sections of et electrical resistance heating element form an electrical parallel circuit together.
摘要:
Die Erfindung betrifft ein Formwerkzeug für die Herstellung von Bauteilen aus Faserverbundwerkstoffen, bei dem das Formwerkzeug eine Faserverbundstruktur und ein elektrisches Widerstandsheizelement aufweist, wobei in die Faserverbundstruktur des Formwerkzeuges nahe der formgebenden Oberfläche des Formwerkzeuges Kohlenstofffasern oder Kohlenstofffilamente in einer Kunststoffmatrix eingelagert sind. Ein derartiges Formwerkzeug wird dadurch weiter entwickelt, dass die Kohlenstofffasern oder Kohlenstofffilamente in der Kunststoffmatrix nahe der formgebenden Oberfläche im wesentlichen die mechanische Festigkeit des Formwerkzeuges bestimmen und das elektrische Widerstandsheizelement derart verschaltet ist, dass zumindest einzelne Abschnitte des elektrischen Widerstandsheizelementes miteinander eine elektrische Parallelschaltung bilden.
摘要:
Die Anordnung zum Erzeugen eines Stromf lusses durch Kohlenstofffasern umfasst eine Stromquelle, mindestens zwei mit der Stromquelle verbundene elektrische Leiter (5) und eine Vielzahl von in eine elektrisch isolierende Masse (6) ein gebetteten Kohlenstofffasern (3). Erfindungsgemäß sind die Kohlenstofffasern (3) über ihre Endflächen (4) mit den elektrischen Leitern (5) elektrisch leitend verbunden, wobei die Endflächen (4) größer sind als die Querschnittsflächender jeweiligen Kohlenstofffasern (3). Beim Erzeugen eines Stromflusses durch Kohlenstofffasern (3) stellt sich das Problem, dass ein Übergangswiderstand zwischen der Kohlenstofffaser (3) und einem elektrisch leitfähigen Material (8), mit dem die Kohlenstofffaser (3) in Kontakt gebracht wird, zu überwinden ist. Das Problem wird dadurch gelöst, dass die Übergangsfläche (4) zwischen elektrisch leitfähigem Material (8) und Kohlenstofffasern (3) vergrößert wird, indem die Kohlenstofffasern (3) schräg zu ihrer Längsrichtung durchtrennt werden.
摘要:
An exemplary method of manufacturing a polymer matrix composite electromagnetic shielding structure includes pretreating a dry fiber reinforcement with a composition including a carrier and a conductive element, laying out the pretreated reinforcement to form a pre-form structure, applying a resin to the pre-form structure, and curing the resin at room temperature. Another exemplary method of manufacturing a polymer matrix composite electromagnetic shielding structure includes laying out a plurality of dry fiber reinforcements, placing at least one ply between any two of the plurality of dry fiber reinforcements, the ply having a non-woven including a conductive material, applying a resin to the plurality of dry fiber reinforcements and the at least one ply, and curing the resin.
摘要:
A prepreg, comprising a stacked body impregnated with resin having two triaxial textile prepregs (101) and an electrically conductive unwoven cloth (102) stacked each other, wherein an antenna reflector is formed by laying up the prepreg, and the unwoven cloth may be a thermally conductive unwoven cloth, thermally insulating unwoven cloth, conductive unwoven cloth, insulating unwoven cloth, thermally conductive and electrically conductive unwoven cloth, thermally conductive and insulating unwoven cloth, thermally insulating and electrically conductive unwoven cloth, and thermally insulating and insulating unwoven cloth.
摘要:
The invention is related to a method for the production of sheet like material that can be used in applications where polymer based material has to conduct electric current at low impedance, especially for application in electrodes, like the electrodes of polymer electrolyte membrane (PEM) fuel cells, the sheet material being electrically conductive composite material comprising a non conductive polymer binder and electrically conductive compounds. The method according to this invention has as its objective to provide a method for large-scale production of electrical conductive sheet like material in which the disadvantages of the prior art are avoided.
摘要:
The invention relates to a highly flexible electrically conductive layer material containing non-metal powder, especially carbon, as conductive component and to a method for the production thereof. Low-specific electrical resistance, high mechanical stability and flexibility can be obtained while using cost-effective materials and a simple production method. According to the invention, the layer material is characterized in that the contact points between the conductive non-metal particles are well defined and in that coatings of binding polymers are avoided. This is achieved in that the contact points are formed before adding the essential binder by pressing or rolling. The binder is added subsequently in the form of a liquid, hardenable plastic material that fills in part of fully the pores of the layer material. In order to improve mechanical properties, the layer material may contain fibers, e.g. carbon fibers. The layer material can be used for shielding against electromagnetic interferences, as mechanical reinforcement for gas diffusing electrodes or as bipolar plates to separate reactants in electrochemical cell stacks, especially PEM fuel cells.