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US 2003/0192667 A2Published application
Improvements in and relating to investment casting
AssigneeNone recorded
InventorsRichard Dudley SHAW, Daniel James DUFFEY
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AssigneeNone recorded
InventorsRichard Dudley SHAW, Daniel James DUFFEY
Estimating the term…
Abstract of the Disclosure The present invention relates to improvements in and relating to investment casting. In particular, the invention provides a method of investment casting, comprising the steps of mixing a binder, a refractory material, and a quantity of water-insoluble organic fibres to form a slurry; coating an expendable pattern with a coat of said slurry; and drying said coat or allowing said coat to dry to form a shell. The present invention further provides a refractory slurry for use in the method of the invention, and a kit of ingredients for putting the method of the invention into effect.
A kit of ingredients for forming a slurry for use in investment casting, which kit comprises a binder, a refractory material, and a quantity of water-insoluble fibers, wherein said fibers are organic, the fiber length and quantity of fibers provided for the kit being selected such that when the kit ingredients are mixed with a prescribed quantity of liquid, the slurry formed is smooth and stable and has a viscosity in the range 10-180 seconds measured on a B4 cup, and forms thicker costs around a dipped object than a corresponding slurry lacking said fibers.
A refractory slurry for use in a method of investment casting, the slurry comprising a binder, a refractory material, and a quantity of water-insoluble organic fibers, the fiber length, quantity of fibers and quantity of liquid mixed therewith being selected such that the slurry has a viscosity in the range 10-180 seconds measured on a B4 cup;
Dependencies are inferred from the claim text.
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Characterised by the use of binding agents; Mixtures of binding agents: in the manufacture of multilayered shell moulds
Compositions of refractory mould or core materials
Compositions of refractory mould or core materials; Grain structures thereof ; Chemical or physical features in the formation or manufacture of…
Sand moulds or like moulds for shaped castings: use of lost patterns
Term end not estimated
This application is a division of Application No. 09/677,757, filed October 3, 2000, the entire content of which is hereby incorporated by reference in this application.
The present invention relates to improvements in and relating to investment casting. In particular, the invention relates to a method of investment casting which involves the successive application of one or more coats of a refractory slurry to an expendable pattern, so as to build up a shell. The present invention further provides a refractory slurry for use in the method of the invention, and a kit of ingredients for putting the method of the invention into effect.
The process of investment casting, otherwise known as the lost wax process, is well known and widely used. Typically, the process involves dipping a wax model into a slurry comprising a binder and a refractory material, so as to coat the model with a layer of slurry; applying a stucco coating of dry refractory to the surface of the layer; allowing the resulting stuccoed slurry layer to dry; and applying further stuccoed slurry layers as appropriate to create a shell mould around the wax model having a suitable thickness. After thorough drying, the wax model is eliminated from the shell mould, and the mould is fired.