COMPOSITION OF CERAMIC LAYER FOR MAKING MOULDS AND OTHER ARTICLES Russian patent published in 2016 - IPC B22C9/04 C04B35/16 

FIELD: metallurgy.

SUBSTANCE: invention can be used for production of casts by method of casting on molten models. Composition contains a liquid ceramic mass and ceramic material for dusting. Liquid ceramic mixture contains, wt%: 50-75 % - ceramic material, which is a mixture with particle size distribution, containing at least 90 % particles with size less than 0.04 mm, havin following phase composition: 30-90 % forsterite Mg₂SiO₄, 5-15 % fiyalite Fe₂SiO₄ and 5-65 % of mixture of phase components, such as chrysolite 2(Mg_0.88Fe_0.12) SiO₂, enstatite MgSiO₃, tremolite Ca₂Mg₅Si₈O₂₂(OH)₂, ringwoodite (Mg,Fe)₂, diopside Ca(Mg,Al)(Si,Al)₂O₆ and other, and 25-50% binder containing aqueous or aqueous-organic colloidal solution of metal oxide and modifiers. Ceramic material for dusting is a mixture, having following phase composition, wt%: 30-90% forsterite Mg₂SiO₄, 5-15 % fayalite Fe₂SiO₄ and 5-65 % of mixture of phase components, such as chrysolite 2(Mg_0.88Fe_0.12)SiO₂, enstatite MgSiO₃, tremolite Ca₂Mg₅Si₈O₂₂(OH)₂, ringwoodite (Mg,Fe)₂, diopside Ca(Mg,Al)(Si,Al)₂O₆ and others.

EFFECT: preventing breakdown of moulds when filling with metal and possibility of directional solidification of castings.

1 cl, 4 ex