FIELD: metallurgy.
SUBSTANCE: model block surfaces are cleaned from lubricants and contaminants by aqueous solution of detergents. A ceramic suspension based on silica sol is applied to the model block. Then it is filled with refractory granular material. The face layer is dried in air flow with moisture content of 45-55%. The cycles for application of ceramic suspension layer are repeated. Filling and drying each of them in dry air flow is carried out with 30-40% moisture content. Then model mass is burnt out and ceramic mould is subjected to heat treatment by calcination in temperature range from 700 to 850°C with following cooling in furnace for 8-12 hours. The moulds are removed from the furnace at the temperature not more than 100°C and cooled in air.
EFFECT: improved quality of the casting ceramic moulds.
3 cl, 1 tbl, 5 ex
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