Patent ID: 6769475
Filing Date: 2004-08-03
Classification: B22C

Abstract:
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, wherein the quantity of fibers is 2% or less by weight of the slurry, and the weight/weight ratio of refractory material to binder is in the range 5:1 to 1:1, and the quantity of liquid mixed therewith is selected such that the slurry has a viscosity in the range 10-180 seconds measured on a B4 cup; the method comprising coating an expendable pattern with one or more coats of said slurry; and drying said one or more coats or allowing said one or more coats to dry to form a shell.