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SLURRY FOR FORMING INTERMEDIATE LAYER OF COLLAPSIBLE CORE AND PRODUCTION OF COLLAPSIBLE CORE BY USING THIS SLURRY AND COLLAPSIBLE CORE PRODUCED BY THIS METHOD
SLURRY FOR FORMING INTERMEDIATE LAYER OF COLLAPSIBLE CORE AND PRODUCTION OF COLLAPSIBLE CORE BY USING THIS SLURRY AND COLLAPSIBLE CORE PRODUCED BY THIS METHOD
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机译：通过使用该泥浆和通过该方法生产的可塌陷的芯形成泥浆中间层的泥浆和生产可塌陷的心
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摘要
PURPOSE:To provide the core having excellent pressure resistance by adding an acidity control agent to a suspension prepd. by mixing refractories, water soluble urea resin and water, kneading the suspension and changing the pH of this suspension, thereby controlling the viscosity. CONSTITUTION:The slurry 2 for forming an intermediate layer is applied on the surface of the sand core 1a and while the slurry is held half-dried, the slurry 3 for forming an outside layer consisting of an aq. synthetic mica soln. is applied on the surface thereof. The slurry 2 for forming the above-mentioned intermediate layer and the slurry 3 for forming the outside layer are simultaneously cured by heating, by which the diffused layer across the intermediate layer and the outside layer is formed to intensify the adhesive property between the intermediate layer and the outside layer. The penetration of a molten metal is completely prevented in this way. Since the intermediate layer is acidic, the layer has small hygroscopicity and the generation of cavities is prevented.
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