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Why are clay minerals important for shaping traditional ceramic products?
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traditional ceramics
Stages in the slip casting of a thin-walled whiteware container. Clay powder is mixed in water together with a dispersing agent, which keeps the clay particles suspended evenly throughout the clay-water slurry, or slip. The slip is poured into a plaster mold, where water is drawn out by capillary action and a cast is formed by the deposition of clay particles on the inner surfaces of the mold. The remaining slip is drained, and the cast is allowed to dry partially before the drain hole is plugged and the mold separated. The unfinished ware is given a final drying in an oven before it is fired into a finished product.
Clay minerals are essential to traditional ceramics because they act as "formers," enabling the creation of diverse shapes through their unique physical properties. Their importance stems from their layered crystal structure, which results in extremely small, plate-shaped particles.12
When mixed with water, these particles exhibit specific rheological behaviors that facilitate two primary processing methods:
- Plastic Forming: Because the plate-shaped particles can slip over one another, the clay-water mixture becomes plastic, allowing it to be molded into a desired shape and retain it.32
- Slip Casting: By adding dispersing agents to a high-water-content mixture, manufacturers create stable suspensions called slips or slurries. These suspensions allow for the production of complex shapes by pouring the mixture into porous molds, where capillary forces deposit the clay particles into a solid form.24
Beyond their role in shaping, clay minerals serve as the primary source of aluminosilicates in the manufacturing process. Their ability to hold a shape is fundamental to the production of traditional ceramics.15