Metal-based carbon fiber composite material and method for...

C - Chemistry – Metallurgy – 22 – C

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C22C 49/14 (2006.01) B22F 3/14 (2006.01) C22C 47/14 (2006.01) H01L 23/373 (2006.01)

Patent

CA 2550015

A process in which while inhibiting the formation of metal carbide, there is produced a metal base carbon fiber composite material that is lightweight, having high thermal conductivity and that is capable of control of the direction of heat current. There is provided a process for producing a metal base carbon fiber composite material, comprising the step of performing physical mixing of carbon fibers and metal powder to thereby obtain a metal fiber mixture; the step of charging the metal fiber mixture, while effecting alignment thereof, in a jig; and the step of arranging the jig in the atmosphere, vacuum or an inert atmosphere and passing direct pulse current through the jig under pressure to thereby induce heat generation by which the metal fiber mixture is sintered. In this stage, the composite material contains 10 to 80 mass% of carbon fibers based on the total mass of composite material and is sintered up to 70% or more of the ideal density.

Cette invention se rapporte à un procédé, dans lequel, tout en empêchant la formation de carbure de métal, on produit un matériau composite en fibres de carbone à base de métal qui est léger, qui possède une conductivité thermique élevée et qui est capable de commander la direction du courant de chaleur. Un tel procédé servant à produire un matériau composite en fibres de carbone à base de métal consiste à effectuer un mélange physique de fibres de carbone et de poudre de métal, en vue d'obtenir un mélange de fibres de métal; à charger ce mélange de fibres de métal, tout en effectuant son alignement, dans un gabarit; à placer ce gabarit dans l'atmosphère, sous vide ou dans une atmosphère inerte et à faire passer à travers ce gabarit sous pression un courant pulsé direct, en vue d'induire la production de chaleur, par laquelle le mélange de fibres de métal est fritté. Dans cette étape, le matériau composite contient 10 à 80 % en masse de fibres de carbone calculées sur la base de la masse totale du matériau composite et il est fritté à 70 % ou plus de la densité idéale.

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