FIELD: foundry. SUBSTANCE: invention is applicable when manufacturing hollow castings, chiefly gas turbine motor blades, from refractory alloys prepared, among others, by directed crystallization technique. Casting ceramic cores are manufactured by way of solid-phase sintering of dustlike quartz and electrocorundum formed with plasticizer, the mixture additionally containing, as sintering additives, dustlike sublimate from chamotte production and special-type aluminum powder and oleic acid. Mixture is summarily composed, wt. -%: 40-120 mcm electrocorundum, 17-40; dustlike sublimate, 0.4-1.6; aluminum powder, 0.5-1.5; paraffin-based plasticizer, 13-17; oleic acid, 0.4-1.5; and dustlike quartz, the balance. Once sintering completed, additionally performed is plasma deposition of protective coating of zirconium or aluminum oxide thermochemically stable to refractory alloys under condition of their high-temperature pouring in vacuum. Thickness of coating constitutes 0.025 to 0.10 that of casting. EFFECT: enhanced efficiency of process. 4 cl, 5 tbl
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