MANUFACTURING METHOD OF MULTILAYER SHELL MOULDS FOR INVESTMENT CASTING (VERSIONS) Russian patent published in 2009 - IPC B22C9/04 

FIELD: metallurgy.

SUBSTANCE: method includes successive application on block of dispensable patterns of suspension layers on ethyl silicate binding agent and layers, received on sodium silicate binding agent, package by grain refractory material of each layer. In the capacity of packaging refractory material it is used high-silica sand with addition into it grain wollastonite or granulated slag of blast-furnace or converter manufacturing in amount from 2.5 up to 97.5 wt %. In other version in the capacity of packaging refractory material it is used grain wollastonite or granulated slag of blast-furnace or converter manufacturing.

EFFECT: acceleration of drying of envelopes, increasing of its durability after drying and patterns smelting, gain of strength and thermal stability at tempering and pouring of patterns by metal.

6 cl, 3 tbl