MANUFACTURING METHOD OF SHELL MOULDS BY CASTED MODELS FORMS Russian patent published in 2009 - IPC B22C9/04 

FIELD: metallurgy.

SUBSTANCE: invention relates to foundry field. Method includes treatment of model block in refractory suspension and package of each layer by grain crops material on the basis of silicon dioxide. First two layers on model block is implemented with refractory suspension with binding agent in the form of hydrolysed solution of ethyl silicate, and following layers-with binding agent in the form of liquid glass. In suspension with hydrolysed solution of ethyl silicate it is used filler in which it is additionally introduced pyrogenic silica-alumina powder in amount 0.5-30 wt %. In suspension with liquid glass it is used filler in which it is additionally introduced pyrogenic silica-alumina powder in amount 1.5-80 wt %.

EFFECT: rate increasing of drying of envelopes layers, its refractory property and thermal stability.

2 cl, 3 tbl, 3 ex