Patent ID: 7048034
Filing Date: 2006-05-23
Classification: B22C

Abstract:
1. A method of manufacturing an investment casting shell mold comprising: providing first and second refractory coat slurries wherein at least one of said slurries is formed from a dry blend including fiber and refractory filler, said dry blend being mixed with a binder sol to form said slurry; applying one of said first and second refractory coat slurries over an expendable pattern to produce a coated preform; optionally, applying a stucco of refractory material onto the coated preform; drying the optionally stuccoed, coated preform sufficiently to apply another of said first or second refractory coat slurries over the preform; repeating the application of refractory slurry and optionally stuccoing as many times as necessary to build a preform of desired thickness, provided said preform includes at least one layer of refractory coat slurry formed from said dry blend; drying the multi-layered preform to produce a green investment casting shell mold; and heating the green shell mold to a temperature sufficient to produce a fired investment casting shell mold.