Multilayer metal/flexible graphite seals suitable for...

B - Operations – Transporting – 23 – B

Patent

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B23B 9/04 (2006.01) B23B 37/00 (2006.01) B32B 15/20 (2006.01) C04B 35/536 (2006.01) F16J 15/12 (2006.01)

Patent

CA 2641679

The invention relates to a composite plate which is made by alternately stacking (n+1) flexible graphite sheets and (n) pinhole-perforated metal reinforcing sheets (where n >= 2). The invention is characterised in that the thicknesses of the flexible graphite sheets are such that any segment of the composite plate having a thickness of 2 mm comprises at least 3 layers of flexible graphite and has a graphite mass per unit area of at most 2.34 kg/m2. The invention is also characterised in that, for each of the perforated metal reinforcing sheets, the height of the pinholes therein in relation to the surface of the sheet does not exceed 1.3 times the thickness of the thinnest flexible graphite layer to which it is attached. Said composite plate can be used to produce seals resistant to temperatures of up to 550 °C in continuous service.

L'invention concerne une planche composite réalisée par empilement alterné de (n+1) feuilles de graphite souple et de (n) feuilles de renfort métalliques perforées à picots (où n >= 2) , caractérisée en ce que les épaisseurs des feuilles de graphite souple utilisées sont telles que toute tranche d'épaisseur de 2 mm de la planche composite comporte au moins 3 couches de graphite souple, et présente une masse de graphite par unité de surface d'au plus 2,34 kg/m2, et en ce que pour chacune des dites feuilles de renfort métalliques perforées, les picots présents sur ladite feuille ont une hauteur par rapport à la surface de ladite feuille qui ne dépasse pas 1,3 fois l'épaisseur de la plus fine des couches de graphite souple à laquelle elle est attachée. Cette planche composite permet la fabrication de joints d'étanchéité qui résistent à des températures jusqu'à 55O0C en régime permanent.

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