FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy. Suspension contains ethyl silicate, alcoholic solution of nonahydrate aluminium nitrate, electrocorundum micro powders, aluminium powder and yttrium oxide at the following ratio of components in wt %: ethyl silicate - 5.0-8; ethyl alcohol - 14.0-17.0; nonahydrate aluminium nitrate - 1.3-2.0; hydrochloric of nitric acid - 0.06-0.1; butyral resin - 0.03-0.09; aluminium powder - 3.0-6.0; yttrium oxide - 4.0-8.0, and electrocorundum micro powders making the rest.
EFFECT: smaller interaction between ceramic mould and casting metal.
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