Abstract: A composition of a ceramic layer for manufacturing a casting mould and other products, in particular intended for making castings by investment casting, comprising a liquid ceramic mass consisting of, in weight %, 50-75% of a ceramic material which is a mixture with particle-size distribution comprising minimum 90% of particles of size less than 0.

Abstract: A composition of a ceramic layer for manufacturing a casting mould and other products, in particular intended for making castings by investment casting, comprising a liquid ceramic mass consisting of in weight %, 50-75% of a ceramic material which is a mixture with particle-size distribution comprising minimum 90% of particles of size less than 0.04 mm, having the following phase composition: 30-90% of forsterite Mg2SiO4, 5-15% of fayalite Fe2SiO4 and 5-65% of a mixture of phase components such as chrysolite 2(Mg0.88Fe0.12)SiO2, enstatite MgSiO3, tremolite Ca2Mg5Si8O22(OH)2, ringwoodite (Mg,Fe)2, diopside Ca(Mg,AI)(Si,AI)2O6 and others, and of 25-50% of a binder comprising an aqueous or aqueous-organic colloidal solution of a metallic oxide and modifiers, and a ceramic material for sprinkling which is a mixture having the following phase composition, in weight %: 30-90% of forsterite Mg2SiO4, 5-15% of fayalite Fe2SiO4, and 5-65% of a mixture of phase components such as chrysolite 2(Mg0.88Fe0.

Abstract: A method for producing investment castings, preferably in ceramic moulds, from alloys based on Al, Mg, Cu, Zn and Fe, characterised in that the ceramic mould is baked at temperatures of 800-1000° C. for 2-4 hours, then the mould is cooled to a temperature of 20-950° C. and is held at this temperature for 10-40 minutes, then it is poured with liquid alloy overheated by from 50 to 200° C. above the initial melting point and after a lapse of 10-100 seconds, the mould is immersed at a fixed or variable speed in a liquid cooling medium, which is a 1-99 volume percent aqueous solution of liquid polymer at a temperature of 15-85° C. The liquid polymer is a polymer of the PAG or PVP, or ACR, or PEO type. The ceramic moulds made of aluminosilicate, or high alumina refractory materials, especially based on synthetic sand, for example Molochite, are used.