Water dispersible moulds

B - Operations – Transporting – 22 – C

Patent

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Details

B22C 1/18 (2006.01)

Patent

CA 2094124

A water dispersible mould for making a casting, the mould comprising a water-insoluble particulate material and a binder therefor, the binder including polyphosphate chains and/or borate ions. The invention also provides a process for making a water dispersible mould for making a casting, the process including the steps of: (a) providing a water-insoluble particulate material; (b) combining the particulate material with a binder including polyphosphate chains and/or borate ions, the chains and/or ions being dissolved in water; (c) forming, either during or after step (b), the particulate material and binder mixture into a desired shape; and (d) removing free water from the mixture. The polyphosphate chains may be derived from a water soluble phosphate glass and the borate ions may be derived from a soluble borate glass.

Moule hydrodispersable pour l'obtention d'une pièce coulée; le moule comprend une matière particulaire hydrosoluble et un liant pour celle-ci; le liant renferme des chaînes de polyphosphate et (ou) des ions borate. L'invention porte également sur un procédé de production d'un moule hydrodispersable pour l'obtention d'une pièce coulée, comprenant les étapes suivantes : a) préparer une matière particulaire hydrodispersable; b) combiner la matière particulaire avec un liant renfermant des chaînes de polyphosphate et (ou) des ions borate, les chaînes et (ou) les ions étant dissous dans l'eau; c) donner au mélange de matière particulaire et de liant, pendant ou après l'étape b, la forme souhaitée; d) éliminer l'eau libre du mélange. Les chaînes de polyphosphate peuvent être dérivées d'un verre de phosphate hydrosoluble, et les ions borate peuvent être dérivés d'un verre de borate soluble.

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