Digitalfire Ceramic Glossary

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Decomposition


Most materials used in ceramics do not just simply melt when fired in a kiln, they go through one or more state changes. Most often these changes result in loss of 'volatiles'. Clays, for example, typically lose about 5-8% (can be up to 12%) of their weight during firing as CO2, H2O, SO3. Calcium carbonate loses 45% as carbon dioxide gas. Materials often generate different gases at different stages of their decomposition. Assessment of the suitability of a material in a body or glaze must include this information. Many materials are impractical for use as body and glaze materials because of the way they decompose and the temperature at which they do so (decomposition is also accompanied by physical state changes, for example, they can expand). For example, hydrated lime is a good source of CaO, but 25% of its weight is converted to water at 500C (to say this would be an inconvenient event in a firing would be an understatement!).

In Bound Links

  • (Project) Ceramic Thermal Events

    Many ceramic problems relate to a lack of understa...

  • (Tests) DTMP - Decomposition Temperature
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