Also known as pouring molding, the slurry with high solid content and good flow ability is injected into the porous mold, and the liquid in the slurry is sucked away by the pores of the mold, leaving a green body with a certain shape and strength in the mold. This forming method is called slip casting. The most commonly used mold is gypsum mold. In recent years, porous plastics mold has also been used. The process includes slurry preparation, gypsum mold preparation and slurry pouring. Disperse suspending agent, adhesive, degassing agent and titrant need to be added when preparing slurry. Dispersive suspension agents are used to prevent particle aggregation and control settling speed. adhesive can enhance green body strength. Titration agents regulate the acidity and alkalinity of the slurry. The molding process is to make a certain concentration of suspended slurry from powder and water (or organic liquid) and inject it into the gypsum mold with the desired shape. The porous gypsum mold absorbs the liquid in the slurry to make the powder become dense, forming the injection parts corresponding to the mold surface. After the liquid in the slurry is sucked dry, the mold is opened and the injection part is taken out. The excess material is removed and dried naturally at room temperature or in an adjustable drying rate device. This method can manufacture large and complex thin-walled products. During the molding process, attention should be paid to the stability, viscosity, bubble elimination, pouring speed, slurry discharge, shrinkage, mold release and green body strength of the slurry.
Inorganic non-metallic materials -> Advanced ceramics -> Ceramic fabrication