Improvements in and relating to investment casting

Details Improvements in and relating to investment casting Improvements in and relating to investment casting

B - Operations, Transporting

22

C

B22C 1/16 (2006.01) B22C 1/00 (2006.01) B22C 1/02 (2006.01) B22C 9/04 (2006.01)

Patent

CA 2403204

A method of investment casting is disclosed, which comprises the preparation of a refractory slurry by mixing a binder, a refractory material, and a quantity of water-insoluble organic fibres, and the application of one or more coats of this slurry to an expendable pattern, so as to build up a shell. It has been found that each coat of the slurry thus formed is surprisingly thick, and that a relatively short drying time is required for each coat, hence enabling a shell of desirable thickness to be rapidly built in a small number of "dipping cycles". The invention also encompasses a kit of ingredients for putting the method of the invention into effect; a shell produced in accordance with this method; and a refractory slurry for use in this method.

L'invention concerne un procédé de moulage à la cire perdue, lequel consiste à préparer une boue réfractaire en mélangeant un liant, un matériau réfractaire ainsi qu'une certaine quantité de fibres organiques, insolubles dans l'eau, à appliquer une ou plusieurs couches de cette boue sur un motif expansible, de façon à construire une coquille. Il a été constaté que chaque couche de boue ainsi formée était étonnamment épaisse, et qu'un temps de séchage relativement court suffisait pour sécher chaque couche, de sorte qu'il est possible d'obtenir une coquille d'épaisseur voulue en un nombre relativement petit de cycles de trempage. L'invention concerne encore un ensemble d'ingrédients destinés à la mise en application de l'invention, une coquille ainsi produite, ainsi qu'une boue réfractaire conçue pour ce procédé.

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