Method for manufacturing fuel cell separator plates under...

H - Electricity – 01 – M

Patent

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H01M 8/02 (2006.01) H01B 1/24 (2006.01)

Patent

CA 2476187

An improved process for fabricating an electrically conductive shaped article is disclosed. The process includes one or more process stages selected from the group consisting of: preparing one or more feeds of the plastic and fillers; feeding the plastic and fillers to a melt compounding stage wherein a homogeneous melt of the composition is obtained; transferring the homogeneous melt ; and subjecting the homogeneous melt to a moulding process to produce the conductive shaped article. One or more of the process stages is conducted under low shear strain conditions so that the article has a through-plane resistivity of less than about 600 ÁOhm-m. Also disclosed are the conductive plates having improved performance properties such as flexural strength, conductivity and surface smoothness.

L'invention concerne un procédé amélioré de fabrication d'article conducteur électrique profilé. Ce procédé comprend une ou plusieurs étapes sélectionnées parmi un groupe d'étapes consistant à préparer un ou plusieurs éléments de plastique et de charges; à mélanger par fusion le plastique et les charges cette étape permettant d'obtenir un mélange homogène de composition; à transférer la composition homogène fondue; et à la soumettre à un processus de moulage afin de produire l'article conducteur profilé. Une, ou plusieurs de ces étapes, est menée dans des conditions de faible contrainte de cisaillement de façon que l'article possède une résistivité dans le plan inférieure à 600 ñOhm-m environ. L'invention concerne aussi des plaques conductrices dont les propriétés de performance, telles que la résistance à la flexion, la conductivité et la rugosité de surface sont améliorées.

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