Mould for metal casting

B - Operations – Transporting – 22 – C

Patent

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B22C 1/00 (2006.01) B22C 1/18 (2006.01) B22C 9/10 (2006.01)

Patent

CA 2426790

A process for forming a mould or a core for casting molten metal by machining (eg cutting or drilling) to the desired shape a bonded particulate refractory material wherein the shear strength of the refractory particles is less than the shear strength of the bonds between the particles. The preferred particulate is aluminosilicate microspherers (eg "flyash floaters") and the binder is preferably based on silica (eg fumed silica/sodium hydroxide). The bonded particulate material is easily machined to form accurately dimensioned moulds or parts thereof.

L'invention concerne un procédé de formation d'un moule ou d'un noyau pour couler un métal fondu, consistant à usiner (par ex. découper ou percer) selon la forme désirée un matériau réfractaire à particules liées. La résistance au cisaillement des particules réfractaires est inférieure à celle des liaisons entre les particules. Les particules préférées sont des microsphères de silicate d'aluminium (par ex. des <= particules flottantes de cendres volantes"). De préférence, le liant est à base de silice (par ex. fumée de silice/hydroxyde de sodium). Par ailleurs, on peut facilement usiner le matériau à base de particules liées pour obtenir des moules, ou des parties de moules, calibrés avec précision.

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