Cold isopressing method

B - Operations – Transporting – 28 – B

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B28B 1/30 (2006.01) B29C 43/00 (2006.01) B29C 43/10 (2006.01) B29C 43/14 (2006.01) B29C 59/00 (2006.01) B30B 11/00 (2006.01) D04H 1/20 (2006.01) B29C 43/16 (2006.01)

Patent

CA 2422997

A cold isopressing method in which first and second layers of at least two layers (16, 22; 38, 40; 38, 46; 38, 52) are formed within an isopressing mold (1, 2) and the second of the layers (22; 40; 46; 52) is isostatically pressed against the first of the layers (16; 38; 46) to compact the second layer (22; 40; 46; 52). The layers (16; 22; 38, 40) can be formed from different materials, for instance granular materials or slurries. Each layer (52) can additionally have different levels of materials (54, 56, 58). The granular materials can have pore formers to produce intermediate porous layers. Channels forming materials (50) can be positioned between layers (38, 46) during isopressing. Alternatively, the first layers (16; 38) can be performed by extrusion, slip casting or injection isopressing molding.

L'invention concerne un procédé de pressage isostatique à froid permettant le formage d'au moins deux couches (16, 22; 38, 40; 38, 46; 38, 52) dans un moule de pressage isostatique (1, 2) et le pressage isostatique de la seconde couche (22; 40; 46; 52) contre la première des couches (16; 38; 46) pour rendre compacte la seconde couche (22; 40; 46; 52). Les couches (16; 22; 38, 40) peuvent être formées à partir de différentes matériaux, comme des matériaux granulaires ou des suspensions épaisses. Chaque couche (52) peut également comprendre différents niveaux de matériaux (54, 56, 58). Les matériaux granulaires peuvent comprendre des éléments porogènes destinés à former des couches intermédiaires poreuses. Des matériaux permettant de former des canaux (50) peuvent être placés entre les couches (38, 46) lors du pressage isostatique. Dans un autre mode de réalisation, les premières couches (16; 38) peuvent être préformées par moulage par pressage isostatique par extrusion, par coulage ou par injection.

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