Water
There is a need to discuss water in ceramic production from a number of viewpoints:
Drying ceramics: Water must be removed in such a way that articles do not crack during drying or explode during firing (due to steam pressure). Even when a piece appears dry there is still likely 5% by weight or more physical water that only drying above its boiling point will remove.
Pugged bodies: Water not only makes the clay plastic, but electrolytes in the water can greatly influence the stability (stiffness changes over time, thixotropy). Thus, in industry, water is filtered and processed before being put into bodies.
Glazes: To maintain consistency in glaze slurries it is important to understand the rheological properties in relation to water and water quality.
Casting slips: The principles of deflocculation, thixotropy depend on understanding the role of water in relation to slurry rheology.
Decomposition: Understanding the role of chemical water in the crystal structure of many minerals is important to understanding when, how and why they generate water vapor during decomposition during firing and how this impacts firing results.
Mineralogy: Many minerals are hydrates and understanding them and their properties involves understanding how water incorporates into their structure during hydration. In some cases water molecules insert into crystals, in other cases oxides are converted to hydroxides.
Solubility: Generally in traditional ceramics, insoluble materials are needed to make body and glaze slurries. It is important to understand which materials to use to source oxides for the chemistry based on solubility, and if solubility can be tolerated, how is the process configured to do so. Out Bound Links
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