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Temperature: 750C - 1000C
NotesConverts to Quicklime. If burned higher or too long it converts to Dead burned lime. The decomposition process of this compound is quite complex and the subject of much discussion and research. Nilo Tozzi, an expert in tile manufacturing, says that 'calcium carbonate decomposes at about 880C when alone but when mixed into a ceramic body its decomposition starts at about 700C'. Clearly the decomposition can occur over a wide range and its rate is related to many factors (particle surface area, atmosphere, pressure, interactions with surrounding particles, density and thickness of the containing matrix). This makes this material highly suspect in glaze flaws related to the generation of gases from constituent materials in the glaze recipe. It may be advisable to source CaO from a frit or wollastonite if you have a problem. See the book Thermal Decomposition of Ionic Solids by Andrew K. Galwey, Michael E. Brown.Out Bound Links
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INSIGHT is ceramic chemistry |