FIELD: manufacturing technology.
SUBSTANCE: invention relates to the foundry. Ceramic shell for investment casting contains three zones: facing, intermediate and support. Facing and support zones are made by layer application of ethylsilicate suspension with subsequent dusting with granular fire-resistant material. Layers of intermediate zone are made by applying organic adhesive solution with subsequent dusting with granular fire-resistant material, at that calcined pulverized refractory of fraction smaller than 0.05 mm is introduced into organic adhesive solution to provide solution with viscosity of 15–25 s by VZ-4 viscometer.
EFFECT: higher strength of shell and dimensional accuracy of obtained casting.
1 cl, 1 dwg
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